Add NIF previewer plugin with Linux-specific fixes

Vendored from github.com/Parapets/mo2-preview_nif and adapted for Linux:

- BSA texture resolution via MO2 virtual tree with case-insensitive
  fallback walk (Linux FS is case-sensitive; NIFs reference textures
  with arbitrary case against files on disk)
- Process-wide cached BSA candidate list, keyed by profile path,
  priority-sorted, filtering disabled mods
- Path backslash normalization before loose-file lookup
- Polygon offset on SLSF1_Decal-flagged shapes to break z-ties with
  coincident base meshes (road decals, moss overlays)
- Opaque framebuffer via glColorMask alpha lock so alpha-blended shapes
  can't bleed the dialog background through the preview area
- QMouseEvent::globalPosition().toPoint() for Qt6 compatibility

Preview dialog behavior (organizercore.cpp):
- Switch previewFile and previewFileWithAlternatives from stack-allocated
  exec() to heap + ApplicationModal + show() + WA_DeleteOnClose.
- Parent passed as nullptr so preview lifetime is decoupled from the
  stack-allocated ModInfoDialog that spawns it. Nested exec() inside
  the enclosing dialog's exec() was softlocking on close.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

33 files changed, 4198 insertions, 0 deletions

diff --git a/libs/preview_nif/.github/workflows/build.yml b/libs/preview_nif/.github/workflows/build.yml
new file mode 100644
index 0000000..4bb1166
--- /dev/null
+++ b/libs/preview_nif/.github/workflows/build.yml
@@ -0,0 +1,28 @@
+name: Build NIF Preview Plugin
+
+on:
+  push:
+    branches: main
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  build:
+    runs-on: windows-2022
+    steps:
+      - name: Build NIF Preview Plugin
+        uses: ModOrganizer2/build-with-mob-action@master
+        with:
+          mo2-third-parties: fmt libbsarch
+          mo2-dependencies: cmake_common uibase
+      - name: Upload Build
+        uses: actions/upload-artifact@v3
+        with:
+          name: preview_nif
+          path: |
+            ./build/modorganizer_super/${{ github.event.repository.name }}/vsbuild/src/RelWithDebInfo/preview_nif.dll
+      - uses: actions/upload-artifact@v3
+        with:
+          name: preview_nif
+          path: |
+            ./build/modorganizer_super/${{ github.event.repository.name }}/**/data/shaders/*
diff --git a/libs/preview_nif/.gitmodules b/libs/preview_nif/.gitmodules
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/preview_nif/.gitmodules
diff --git a/libs/preview_nif/CMakeLists.txt b/libs/preview_nif/CMakeLists.txt
new file mode 100644
index 0000000..7db3db2
--- /dev/null
+++ b/libs/preview_nif/CMakeLists.txt
@@ -0,0 +1,34 @@
+cmake_minimum_required(VERSION 3.22)
+
+project(preview_nif CXX)
+
+include(FetchContent)
+
+# gli (texture loader — header-only, needs glm)
+FetchContent_Declare(
+    gli
+    GIT_REPOSITORY https://github.com/g-truc/gli.git
+    GIT_TAG        master
+)
+set(GLI_TEST_ENABLE OFF CACHE BOOL "Build gli unit tests")
+
+# nifly (NIF parser)
+FetchContent_Declare(
+    nifly
+    GIT_REPOSITORY https://github.com/ousnius/nifly.git
+    GIT_TAG        main
+)
+
+FetchContent_MakeAvailable(gli nifly)
+
+# mo2_install_target compatibility shim (upstream uses mo2_install_target;
+# Fluorine defines mo2_install_plugin).
+if(NOT COMMAND mo2_install_target AND COMMAND mo2_install_plugin)
+    function(mo2_install_target target)
+        mo2_install_plugin(${target})
+    endfunction()
+endif()
+
+add_subdirectory(src)
+
+target_link_libraries(preview_nif PRIVATE nifly gli)
diff --git a/libs/preview_nif/CMakePresets.json b/libs/preview_nif/CMakePresets.json
new file mode 100644
index 0000000..d00c664
--- /dev/null
+++ b/libs/preview_nif/CMakePresets.json
@@ -0,0 +1,72 @@
+{
+  "version": 3,
+  "configurePresets": [
+    {
+      "name": "windows-2022",
+      "generator": "Visual Studio 17 2022",
+      "binaryDir": "${sourceDir}/vsbuild",
+      "cacheVariables": {
+        "CMAKE_BUILD_TYPE": {
+          "type": "STRING",
+          "value": "Release"
+        },
+        "DEPENDENCIES_DIR": {
+          "type": "PATH",
+          "value": "${sourceDir}/../.."
+        },
+        "BOOST_ROOT": {
+          "type": "PATH",
+          "value": "${sourceDir}/../../boost_1_83_0"
+        },
+        "BOOST_LIBRARYDIR": {
+          "type": "PATH",
+          "value": "${sourceDir}/../../boost_1_83_0/lib64-msvc-14.3/lib"
+        },
+        "FMT_ROOT": {
+          "type": "PATH",
+          "value": "${sourceDir}/../../fmt-8.1.1"
+        },
+        "SPDLOG_ROOT": {
+          "type": "PATH",
+          "value": "${sourceDir}/../../spdlog-v1.10.0"
+        },
+        "LOOT_PATH": {
+          "type": "PATH",
+          "value": "${sourceDir}/../../libloot-0.22.1-win64"
+        },
+        "LZ4_ROOT": {
+          "type": "PATH",
+          "value": "${sourceDir}/../../lz4-v1.9.4"
+        },
+        "QT_ROOT": {
+          "type": "PATH",
+          "value": "C:/Qt/6.5.3/msvc2019_64"
+        },
+        "ZLIB_ROOT": {
+          "type": "PATH",
+          "value": "${sourceDir}/../../zlib-v1.3"
+        },
+        "PYTHON_ROOT": {
+          "type": "PATH",
+          "value": "${sourceDir}/../../python-3.11.5"
+        },
+        "SEVENZ_ROOT": {
+          "type": "PATH",
+          "value": "${sourceDir}/../../7zip-23.01"
+        },
+        "LIBBSARCH_ROOT": {
+          "type": "PATH",
+          "value": "${sourceDir}/../../libbsarch-0.0.9-release-x64"
+        },
+        "BOOST_DI_ROOT": {
+          "type": "PATH",
+          "value": "${sourceDir}/../../di"
+        },
+        "GTEST_ROOT": {
+          "type": "PATH",
+          "value": "${sourceDir}/../../googletest"
+        }
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/libs/preview_nif/LICENSE b/libs/preview_nif/LICENSE
new file mode 100644
index 0000000..f288702
--- /dev/null
+++ b/libs/preview_nif/LICENSE
@@ -0,0 +1,674 @@
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+  Nothing in this License shall be construed as excluding or limiting
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+
+  12. No Surrender of Others' Freedom.
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+  If conditions are imposed on you (whether by court order, agreement or
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+  13. Use with the GNU Affero General Public License.
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+  14. Revised Versions of this License.
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+be similar in spirit to the present version, but may differ in detail to
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+  If the Program specifies that a proxy can decide which future
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+  17. Interpretation of Sections 15 and 16.
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+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
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+possible use to the public, the best way to achieve this is to make it
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+    Copyright (C) <year>  <name of author>
+
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+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
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+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
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+    <program>  Copyright (C) <year>  <name of author>
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+
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+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
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+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/libs/preview_nif/README.md b/libs/preview_nif/README.md
new file mode 100644
index 0000000..126825c
--- /dev/null
+++ b/libs/preview_nif/README.md
@@ -0,0 +1,2 @@
+# modorganizer-preview_nif
+NIF preview plugin for Mod Organizer
diff --git a/libs/preview_nif/data/shaders/NIFSKOPE LICENSE.md b/libs/preview_nif/data/shaders/NIFSKOPE LICENSE.md
new file mode 100644
index 0000000..d038fbe
--- /dev/null
+++ b/libs/preview_nif/data/shaders/NIFSKOPE LICENSE.md
@@ -0,0 +1,27 @@
+NIFSKOPE LICENSE
+
+Copyright (c) 2005-2014, NIF File Format Library and Tools.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+3. The name of the NIF File Format Library and Tools project may not be
+   used to endorse or promote products derived from this software
+   without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/libs/preview_nif/data/shaders/default.vert b/libs/preview_nif/data/shaders/default.vert
new file mode 100644
index 0000000..90cccd3
--- /dev/null
+++ b/libs/preview_nif/data/shaders/default.vert
@@ -0,0 +1,50 @@
+#version 120
+
+uniform mat4 modelViewMatrix;
+uniform mat4 mvpMatrix;
+uniform mat3 normalMatrix;
+uniform vec3 lightDirection;
+uniform vec4 ambientColor;
+uniform vec4 diffuseColor;
+
+attribute vec3 position;
+attribute vec3 normal;
+attribute vec3 tangent;
+attribute vec3 bitangent;
+attribute vec2 texCoord;
+attribute vec4 color;
+
+varying vec2 TexCoord;
+varying vec3 LightDir;
+varying vec3 ViewDir;
+
+varying vec3 N;
+varying vec3 t;
+varying vec3 b;
+varying vec3 v;
+
+varying vec4 A;
+varying vec4 C;
+varying vec4 D;
+
+void main( void )
+{
+    gl_Position = mvpMatrix * vec4(position, 1.0);
+    TexCoord = texCoord;
+
+    N = normalize(normalMatrix * normal);
+    t = normalize(normalMatrix * tangent);
+    b = normalize(normalMatrix * bitangent);
+    v = vec3(modelViewMatrix * vec4(position, 1.0));
+
+    mat3 tbnMatrix = mat3(b.x, t.x, N.x,
+                          b.y, t.y, N.y,
+                          b.z, t.z, N.z);
+
+    ViewDir = tbnMatrix * -v;
+    LightDir = tbnMatrix * lightDirection;
+
+    A = ambientColor;
+    C = color;
+    D = diffuseColor;
+}
diff --git a/libs/preview_nif/data/shaders/fo4_default.frag b/libs/preview_nif/data/shaders/fo4_default.frag
new file mode 100644
index 0000000..2b1d6b8
--- /dev/null
+++ b/libs/preview_nif/data/shaders/fo4_default.frag
@@ -0,0 +1,341 @@
+#version 120
+#extension GL_ARB_shader_texture_lod : require
+
+uniform sampler2D BaseMap;
+uniform sampler2D NormalMap;
+uniform sampler2D GlowMap;
+uniform sampler2D BacklightMap;
+uniform sampler2D SpecularMap;
+uniform sampler2D GreyscaleMap;
+uniform sampler2D EnvironmentMap;
+uniform samplerCube CubeMap;
+
+uniform vec3 specColor;
+uniform float specStrength;
+uniform float specGlossiness; // "Smoothness" in FO4; 0-1
+uniform float fresnelPower;
+
+uniform float paletteScale;
+
+uniform vec3 glowColor;
+uniform float glowMult;
+
+uniform float alpha;
+
+uniform vec3 tintColor;
+
+uniform vec2 uvScale;
+uniform vec2 uvOffset;
+
+uniform bool hasEmit;
+uniform bool hasGlowMap;
+uniform bool hasSoftlight;
+uniform bool hasBacklight;
+uniform bool hasRimlight;
+uniform bool hasTintColor;
+uniform bool hasCubeMap;
+uniform bool hasEnvMask;
+uniform bool hasSpecularMap;
+uniform bool greyscaleColor;
+uniform bool doubleSided;
+
+uniform float subsurfaceRolloff;
+uniform float rimPower;
+uniform float backlightPower;
+
+uniform float envReflection;
+
+uniform mat4 modelViewMatrixInverse;
+uniform mat4 worldMatrix;
+
+varying vec2 TexCoord;
+varying vec3 LightDir;
+varying vec3 ViewDir;
+
+varying vec4 A;
+varying vec4 C;
+varying vec4 D;
+
+varying vec3 N;
+varying vec3 t;
+varying vec3 b;
+
+#ifndef M_PI
+    #define M_PI 3.1415926535897932384626433832795
+#endif
+
+#define FLT_EPSILON 1.192092896e-07F // smallest such that 1.0 + FLT_EPSILON != 1.0
+
+float OrenNayar( vec3 L, vec3 V, vec3 N, float roughness, float NdotL )
+{
+    //float NdotL = dot(N, L);
+    float NdotV = dot(N, V);
+    float LdotV = dot(L, V);
+
+    float rough2 = roughness * roughness;
+
+    float A = 1.0 - 0.5 * (rough2 / (rough2 + 0.57));
+    float B = 0.45 * (rough2 / (rough2 + 0.09));
+
+    float a = min( NdotV, NdotL );
+    float b = max( NdotV, NdotL );
+    b = (sign(b) == 0.0) ? FLT_EPSILON : sign(b) * max( 0.01, abs(b) ); // For fudging the smoothness of C
+    float C = sqrt( (1.0 - a * a) * (1.0 - b * b) ) / b;
+
+    float gamma = LdotV - NdotL * NdotV;
+    float L1 = A + B * max( gamma, FLT_EPSILON ) * C;
+
+    return L1 * max( NdotL, FLT_EPSILON );
+}
+
+float OrenNayarFull( vec3 L, vec3 V, vec3 N, float roughness, float NdotL )
+{
+    //float NdotL = dot(N, L);
+    float NdotV = dot(N, V);
+    float LdotV = dot(L, V);
+
+    float angleVN = acos(max(NdotV, FLT_EPSILON));
+    float angleLN = acos(max(NdotL, FLT_EPSILON));
+
+    float alpha = max(angleVN, angleLN);
+    float beta = min(angleVN, angleLN);
+    float gamma = LdotV - NdotL * NdotV;
+
+    float roughnessSquared = roughness * roughness;
+    float roughnessSquared9 = (roughnessSquared / (roughnessSquared + 0.09));
+
+    // C1, C2, and C3
+    float C1 = 1.0 - 0.5 * (roughnessSquared / (roughnessSquared + 0.33));
+    float C2 = 0.45 * roughnessSquared9;
+
+    if( gamma >= 0.0 ) {
+        C2 *= sin(alpha);
+    } else {
+        C2 *= (sin(alpha) - pow((2.0 * beta) / M_PI, 3.0));
+    }
+
+    float powValue = (4.0 * alpha * beta) / (M_PI * M_PI);
+    float C3 = 0.125 * roughnessSquared9 * powValue * powValue;
+
+    // Avoid asymptote at pi/2
+    float asym = M_PI / 2.0;
+    float lim1 = asym + 0.01;
+    float lim2 = asym - 0.01;
+
+    float ab2 = (alpha + beta) / 2.0;
+
+    if ( beta >= asym && beta < lim1 )
+        beta = lim1;
+    else if ( beta < asym && beta >= lim2 )
+        beta = lim2;
+
+    if ( ab2 >= asym && ab2 < lim1 )
+        ab2 = lim1;
+    else if ( ab2 < asym && ab2 >= lim2 )
+        ab2 = lim2;
+
+    // Reflection
+    float A = gamma * C2 * tan(beta);
+    float B = (1.0 - abs(gamma)) * C3 * tan(ab2);
+
+    float L1 = max(FLT_EPSILON, NdotL) * (C1 + A + B);
+
+    // Interreflection
+    float twoBetaPi = 2.0 * beta / M_PI;
+    float L2 = 0.17 * max(FLT_EPSILON, NdotL) * (roughnessSquared / (roughnessSquared + 0.13)) * (1.0 - gamma * twoBetaPi * twoBetaPi);
+
+    return L1 + L2;
+}
+
+// Schlick's Fresnel approximation
+float fresnelSchlick( float VdotH, float F0 )
+{
+    float base = 1.0 - VdotH;
+    float exp = pow( base, fresnelPower );
+    return clamp( exp + F0 * (1.0 - exp), 0.0, 1.0 );
+}
+
+// The Torrance-Sparrow visibility factor, G
+float VisibDiv( float NdotL, float NdotV, float VdotH, float NdotH )
+{
+    float denom = max( VdotH, FLT_EPSILON );
+    float numL = min( NdotV, NdotL );
+    float numR = 2.0 * NdotH;
+    if ( denom >= (numL * numR) ) {
+        numL = (numL == NdotV) ? 1.0 : (NdotL / NdotV);
+        return (numL * numR) / denom;
+    }
+    return 1.0 / NdotV;
+}
+
+// this is a normalized Phong model used in the Torrance-Sparrow model
+vec3 TorranceSparrow(float NdotL, float NdotH, float NdotV, float VdotH, vec3 color, float power, float F0)
+{
+    // D: Normalized phong model
+    float D = ((power + 2.0) / (2.0 * M_PI)) * pow( NdotH, power );
+
+    // G: Torrance-Sparrow visibility term divided by NdotV
+    float G_NdotV = VisibDiv( NdotL, NdotV, VdotH, NdotH );
+
+    // F: Schlick's approximation
+    float F = fresnelSchlick( VdotH, F0 );
+
+    // Torrance-Sparrow:
+    // (F * G * D) / (4 * NdotL * NdotV)
+    // Division by NdotV is done in VisibDiv()
+    // and division by NdotL is removed since
+    // outgoing radiance is determined by:
+    // BRDF * NdotL * L()
+    float spec = (F * G_NdotV * D) / 4.0;
+
+    return color * spec * M_PI;
+}
+
+vec3 tonemap(vec3 x)
+{
+    float _A = 0.15;
+    float _B = 0.50;
+    float _C = 0.10;
+    float _D = 0.20;
+    float _E = 0.02;
+    float _F = 0.30;
+
+    return ((x*(_A*x+_C*_B)+_D*_E)/(x*(_A*x+_B)+_D*_F))-_E/_F;
+}
+
+vec4 colorLookup( float x, float y ) {
+
+    return texture2D( GreyscaleMap, vec2( clamp(x, 0.0, 1.0), clamp(y, 0.0, 1.0) ) );
+}
+
+void main( void )
+{
+    vec2 offset = TexCoord * uvScale + uvOffset;
+
+    vec4 baseMap = texture2D( BaseMap, offset );
+    vec4 normalMap = texture2D( NormalMap, offset );
+    vec4 specMap = texture2D( SpecularMap, offset );
+    vec4 glowMap = texture2D( GlowMap, offset );
+
+    vec3 normal = normalize(normalMap.rgb * 2.0 - 1.0);
+    // Calculate missing blue channel
+    normal.b = sqrt(1.0 - dot(normal.rg, normal.rg));
+    if ( !gl_FrontFacing && doubleSided ) {
+        normal *= -1.0;
+    }
+    // For _msn (Test with FSF1_Face)
+    //normal.z = sqrt( 1.0 - dot( normal.xy, normal.xy ) );
+
+    vec3 L = normalize(LightDir);
+    vec3 V = normalize(ViewDir);
+    vec3 R = reflect(-L, normal);
+    vec3 H = normalize( L + V );
+
+    float NdotL = dot(normal, L);
+    float NdotL0 = max( NdotL, FLT_EPSILON );
+    float NdotH = max( dot(normal, H), FLT_EPSILON );
+    float NdotV = max( dot(normal, V), FLT_EPSILON );
+    float VdotH = max( dot(V, H), FLT_EPSILON );
+    float NdotNegL = max( dot(normal, -L), FLT_EPSILON );
+
+    vec3 reflected = reflect( V, normal );
+    vec3 reflectedVS = b * reflected.x + t * reflected.y + N * reflected.z;
+    vec3 reflectedWS = vec3( worldMatrix * (modelViewMatrixInverse * vec4( reflectedVS, 0.0 )) );
+
+    vec4 color;
+    vec3 albedo = baseMap.rgb * C.rgb;
+    vec3 diffuse = A.rgb + D.rgb * NdotL0;
+    if ( greyscaleColor ) {
+        vec4 luG = colorLookup( baseMap.g, paletteScale - (1 - C.r) );
+
+        albedo = luG.rgb;
+    }
+
+    // Emissive
+    vec3 emissive = vec3(0.0);
+    if ( hasEmit ) {
+        emissive += glowColor * glowMult;
+
+        if ( hasGlowMap ) {
+            emissive *= glowMap.rgb;
+        }
+    }
+
+    // Specular
+    float g = 1.0;
+    float s = 1.0;
+    float smoothness = clamp( specGlossiness, 0.0, 1.0 );
+    float specMask = 1.0;
+    vec3 spec = vec3(0.0);
+    if ( hasSpecularMap ) {
+        g = specMap.g;
+        s = specMap.r;
+        smoothness = g * smoothness;
+        float fSpecularPower = exp2( smoothness * 10 + 1 );
+        specMask = s * specStrength;
+
+        spec = TorranceSparrow( NdotL0, NdotH, NdotV, VdotH, vec3(specMask), fSpecularPower, 0.2 ) * NdotL0 * D.rgb * specColor;
+    }
+
+    // Environment
+    vec4 cube = textureCubeLod( CubeMap, reflectedWS, 8.0 - smoothness * 8.0 );
+    vec4 env = texture2D( EnvironmentMap, offset );
+    if ( hasCubeMap ) {
+        cube.rgb *= envReflection * specStrength;
+        if ( hasEnvMask ) {
+            cube.rgb *= env.r;
+        } else {
+            cube.rgb *= s;
+        }
+
+        spec += cube.rgb * diffuse;
+    }
+
+    vec3 backlight = vec3(0.0);
+    if ( backlightPower > 0.0 ) {
+        backlight = albedo * NdotNegL * clamp( backlightPower, 0.0, 1.0 );
+
+        emissive += backlight * D.rgb;
+    }
+
+    vec3 rim = vec3(0.0);
+    if ( hasRimlight ) {
+        rim = vec3(pow((1.0 - NdotV), rimPower));
+        rim *= smoothstep( -0.2, 1.0, dot(-L, V) );
+
+        //emissive += rim * D.rgb * specMask;
+    }
+
+    // Diffuse
+    float diff = OrenNayarFull( L, V, normal, 1.0 - smoothness, NdotL );
+    diffuse = vec3(diff);
+
+    vec3 soft = vec3(0.0);
+    float wrap = NdotL;
+    if ( hasSoftlight || subsurfaceRolloff > 0.0 ) {
+        wrap = (wrap + subsurfaceRolloff) / (1.0 + subsurfaceRolloff);
+        soft = albedo * max( 0.0, wrap ) * smoothstep( 1.0, 0.0, sqrt(diff) );
+
+        diffuse += soft;
+    }
+
+    if ( hasTintColor ) {
+        albedo *= tintColor;
+    }
+
+    // Diffuse
+    color.rgb = diffuse * albedo * D.rgb;
+    // Ambient
+    color.rgb += A.rgb * albedo;
+    // Specular
+    color.rgb += spec;
+    color.rgb += A.rgb * specMask * fresnelSchlick( VdotH, 0.2 ) * (1.0 - NdotV) * D.rgb;
+    // Emissive
+    color.rgb += emissive;
+
+    color.rgb = tonemap( color.rgb ) / tonemap( vec3(1.0) );
+    color.a = C.a * baseMap.a;
+
+    gl_FragColor = color;
+    gl_FragColor.a *= alpha;
+}
diff --git a/libs/preview_nif/data/shaders/fo4_effectshader.frag b/libs/preview_nif/data/shaders/fo4_effectshader.frag
new file mode 100644
index 0000000..31b241f
--- /dev/null
+++ b/libs/preview_nif/data/shaders/fo4_effectshader.frag
@@ -0,0 +1,148 @@
+#version 120
+
+uniform sampler2D BaseMap;
+uniform sampler2D GreyscaleMap;
+uniform samplerCube CubeMap;
+uniform sampler2D NormalMap;
+uniform sampler2D SpecularMap;
+
+uniform bool doubleSided;
+
+uniform bool hasSourceTexture;
+uniform bool hasGreyscaleMap;
+uniform bool hasCubeMap;
+uniform bool hasNormalMap;
+uniform bool hasEnvMask;
+
+uniform bool greyscaleAlpha;
+uniform bool greyscaleColor;
+
+uniform bool useFalloff;
+uniform bool hasRGBFalloff;
+
+uniform bool hasWeaponBlood;
+
+uniform vec4 glowColor;
+uniform float glowMult;
+
+uniform vec2 uvScale;
+uniform vec2 uvOffset;
+
+uniform vec4 falloffParams;
+uniform float falloffDepth;
+
+uniform float lightingInfluence;
+uniform float envReflection;
+
+uniform mat4 modelViewMatrixInverse;
+uniform mat4 worldMatrix;
+
+varying vec2 TexCoord;
+varying vec3 LightDir;
+varying vec3 ViewDir;
+
+varying vec4 A;
+varying vec4 C;
+varying vec4 D;
+
+varying vec3 N;
+varying vec3 t;
+varying vec3 b;
+varying vec3 v;
+
+vec4 colorLookup( float x, float y ) {
+
+    return texture2D( GreyscaleMap, vec2( clamp(x, 0.0, 1.0), clamp(y, 0.0, 1.0)) );
+}
+
+void main( void )
+{
+    vec2 offset = TexCoord * uvScale + uvOffset;
+
+    vec4 baseMap = texture2D( BaseMap, offset );
+    vec4 normalMap = texture2D( NormalMap, offset );
+    vec4 specMap = texture2D( SpecularMap, offset );
+
+    vec3 normal = normalize(normalMap.rgb * 2.0 - 1.0);
+    // Calculate missing blue channel
+    normal.b = sqrt(1.0 - dot(normal.rg, normal.rg));
+    if ( !gl_FrontFacing && doubleSided ) {
+        normal *= -1.0;
+    }
+
+    vec3 L = normalize(LightDir);
+    vec3 V = normalize(ViewDir);
+    vec3 R = reflect(-L, normal);
+    vec3 H = normalize( L + V );
+
+    float NdotL = max( dot(normal, L), 0.000001 );
+    float NdotH = max( dot(normal, H), 0.000001 );
+    float NdotV = max( dot(normal, V), 0.000001 );
+    float LdotH = max( dot(L, H), 0.000001 );
+    float NdotNegL = max( dot(normal, -L), 0.000001 );
+
+    vec3 reflected = reflect( V, normal );
+    vec3 reflectedVS = b * reflected.x + t * reflected.y + N * reflected.z;
+    vec3 reflectedWS = vec3( worldMatrix * (modelViewMatrixInverse * vec4( reflectedVS, 0.0 )) );
+
+    if ( greyscaleAlpha )
+        baseMap.a = 1.0;
+
+    vec4 baseColor = glowColor;
+    if ( !greyscaleColor )
+        baseColor.rgb *= glowMult;
+
+    // Falloff
+    float falloff = 1.0;
+    if ( useFalloff || hasRGBFalloff ) {
+        falloff = smoothstep( falloffParams.x, falloffParams.y, abs(dot(normal, V)) );
+        falloff = mix( max(falloffParams.z, 0.0), min(falloffParams.w, 1.0), falloff );
+
+        if ( useFalloff )
+            baseMap.a *= falloff;
+
+        if ( hasRGBFalloff )
+            baseMap.rgb *= falloff;
+    }
+
+    float alphaMult = baseColor.a * baseColor.a;
+
+    vec4 color;
+    color.rgb = baseMap.rgb * C.rgb * baseColor.rgb;
+    color.a = alphaMult * C.a * baseMap.a;
+
+    if ( greyscaleColor ) {
+        vec4 luG = colorLookup( texture2D( BaseMap, offset ).g, baseColor.r * C.r * falloff );
+
+        color.rgb = luG.rgb;
+    }
+
+    if ( greyscaleAlpha ) {
+        vec4 luA = colorLookup( texture2D( BaseMap, offset ).a, color.a );
+
+        color.a = luA.a;
+    }
+
+    vec3 diffuse = A.rgb + (D.rgb * NdotL);
+    color.rgb = mix( color.rgb, color.rgb * D.rgb, lightingInfluence );
+
+    // Specular
+    float g = 1.0;
+    float s = 1.0;
+    if ( hasEnvMask ) {
+        g = specMap.r;
+        s = specMap.g;
+    }
+
+    // Environment
+    vec4 cube = textureCube( CubeMap, reflectedWS );
+    if ( hasCubeMap ) {
+        cube.rgb *= envReflection * s;
+        cube.rgb = mix( cube.rgb, cube.rgb * D.rgb, lightingInfluence );
+
+        color.rgb += cube.rgb * falloff;
+    }
+
+    gl_FragColor.rgb = color.rgb;
+    gl_FragColor.a = color.a;
+}
diff --git a/libs/preview_nif/data/shaders/sk_default.frag b/libs/preview_nif/data/shaders/sk_default.frag
new file mode 100644
index 0000000..7cd0dcf
--- /dev/null
+++ b/libs/preview_nif/data/shaders/sk_default.frag
@@ -0,0 +1,180 @@
+#version 120
+
+uniform sampler2D BaseMap;
+uniform sampler2D NormalMap;
+uniform sampler2D GlowMap;
+uniform sampler2D HeightMap;
+uniform sampler2D LightMask;
+uniform sampler2D BacklightMap;
+uniform sampler2D EnvironmentMap;
+uniform samplerCube CubeMap;
+
+uniform vec3 specColor;
+uniform float specStrength;
+uniform float specGlossiness;
+
+uniform bool hasGlowMap;
+uniform vec3 glowColor;
+uniform float glowMult;
+
+uniform float alpha;
+
+uniform vec3 tintColor;
+
+uniform bool hasHeightMap;
+uniform vec2 uvScale;
+uniform vec2 uvOffset;
+
+uniform bool hasEmit;
+uniform bool hasSoftlight;
+uniform bool hasBacklight;
+uniform bool hasRimlight;
+uniform bool hasTintColor;
+uniform bool hasCubeMap;
+uniform bool hasEnvMask;
+
+uniform float softlight;
+uniform float rimPower;
+
+uniform float envReflection;
+
+uniform mat4 modelViewMatrixInverse;
+uniform mat4 worldMatrix;
+
+varying vec2 TexCoord;
+varying vec3 LightDir;
+varying vec3 ViewDir;
+
+varying vec4 A;
+varying vec4 C;
+varying vec4 D;
+
+varying vec3 N;
+varying vec3 t;
+varying vec3 b;
+
+vec3 tonemap(vec3 x)
+{
+    float _A = 0.15;
+    float _B = 0.50;
+    float _C = 0.10;
+    float _D = 0.20;
+    float _E = 0.02;
+    float _F = 0.30;
+
+    return ((x*(_A*x+_C*_B)+_D*_E)/(x*(_A*x+_B)+_D*_F))-_E/_F;
+}
+
+vec3 toGrayscale(vec3 color)
+{
+    return vec3(dot(vec3(0.3, 0.59, 0.11), color));
+}
+
+void main( void )
+{
+    vec2 offset = TexCoord * uvScale + uvOffset;
+
+    vec3 E = normalize(ViewDir);
+
+    if ( hasHeightMap ) {
+        float height = texture2D( HeightMap, offset ).r;
+        offset += E.xy * (height * 0.08 - 0.04);
+    }
+
+    vec4 baseMap = texture2D( BaseMap, offset );
+    vec4 normalMap = texture2D( NormalMap, offset );
+    vec4 glowMap = texture2D( GlowMap, offset );
+
+    vec3 normal = normalize(normalMap.rgb * 2.0 - 1.0);
+
+    vec3 L = normalize(LightDir);
+    vec3 R = reflect(-L, normal);
+    vec3 H = normalize( L + E );
+
+    float NdotL = max( dot(normal, L), 0.0 );
+    float NdotH = max( dot(normal, H), 0.0 );
+    float EdotN = max( dot(normal, E), 0.0 );
+    float NdotNegL = max( dot(normal, -L), 0.0 );
+
+    vec3 reflected = reflect( -E, normal );
+    vec3 reflectedVS = b * reflected.x + t * reflected.y + N * reflected.z;
+    vec3 reflectedWS = vec3( worldMatrix * (modelViewMatrixInverse * vec4( reflectedVS, 0.0 )) );
+
+
+    vec4 color;
+    vec3 albedo = baseMap.rgb * C.rgb;
+    vec3 diffuse = A.rgb + (D.rgb * NdotL);
+
+
+    // Environment
+    if ( hasCubeMap ) {
+        vec4 cube = textureCube( CubeMap, reflectedWS );
+        cube.rgb *= envReflection;
+
+        if ( hasEnvMask ) {
+            vec4 env = texture2D( EnvironmentMap, offset );
+            cube.rgb *= env.r;
+        } else {
+            cube.rgb *= normalMap.a;
+        }
+
+
+        albedo += cube.rgb;
+    }
+
+    // Emissive & Glow
+    vec3 emissive = vec3(0.0);
+    if ( hasEmit ) {
+        emissive += glowColor * glowMult;
+
+        if ( hasGlowMap ) {
+            emissive *= glowMap.rgb;
+        }
+    }
+
+    // Specular
+    vec3 spec = clamp( specColor * specStrength * normalMap.a * pow(NdotH, specGlossiness), 0.0, 1.0 );
+    spec *= D.rgb;
+
+    vec3 backlight = vec3(0.0);
+    if ( hasBacklight ) {
+        backlight = texture2D( BacklightMap, offset ).rgb;
+        backlight *= NdotNegL;
+
+        emissive += backlight * D.rgb;
+    }
+
+    vec4 mask = vec4(0.0);
+    if ( hasRimlight || hasSoftlight ) {
+        mask = texture2D( LightMask, offset );
+    }
+
+    vec3 rim = vec3(0.0);
+    if ( hasRimlight ) {
+        rim = mask.rgb * pow(vec3((1.0 - EdotN)), vec3(rimPower));
+        rim *= smoothstep( -0.2, 1.0, dot(-L, E) );
+
+        emissive += rim * D.rgb;
+    }
+
+    vec3 soft = vec3(0.0);
+    if ( hasSoftlight ) {
+        float wrap = (dot(normal, L) + softlight) / (1.0 + softlight);
+
+        soft = max( wrap, 0.0 ) * mask.rgb * smoothstep( 1.0, 0.0, NdotL );
+        soft *= sqrt( clamp( softlight, 0.0, 1.0 ) );
+
+        emissive += soft * D.rgb;
+    }
+
+    if ( hasTintColor ) {
+        albedo *= tintColor;
+    }
+
+    color.rgb = albedo * (diffuse + emissive) + spec;
+    color.rgb = tonemap( color.rgb ) / tonemap( vec3(1.0) );
+    color.a = C.a * baseMap.a;
+
+    gl_FragColor = color;
+    gl_FragColor.a *= alpha;
+}
diff --git a/libs/preview_nif/data/shaders/sk_effectshader.frag b/libs/preview_nif/data/shaders/sk_effectshader.frag
new file mode 100644
index 0000000..3a22388
--- /dev/null
+++ b/libs/preview_nif/data/shaders/sk_effectshader.frag
@@ -0,0 +1,101 @@
+#version 120
+
+uniform sampler2D BaseMap;
+uniform sampler2D GreyscaleMap;
+
+uniform bool doubleSided;
+
+uniform bool hasSourceTexture;
+uniform bool hasGreyscaleMap;
+uniform bool greyscaleAlpha;
+uniform bool greyscaleColor;
+
+uniform bool useFalloff;
+uniform bool vertexColors;
+uniform bool vertexAlpha;
+
+uniform bool hasWeaponBlood;
+
+uniform vec4 glowColor;
+uniform float glowMult;
+
+uniform vec2 uvScale;
+uniform vec2 uvOffset;
+
+uniform vec4 falloffParams;
+uniform float falloffDepth;
+
+varying vec2 TexCoord;
+varying vec3 LightDir;
+varying vec3 ViewDir;
+
+varying vec4 C;
+
+varying vec3 N;
+varying vec3 v;
+
+vec4 colorLookup( float x, float y ) {
+
+    return texture2D( GreyscaleMap, vec2( clamp(x, 0.0, 1.0), clamp(y, 0.0, 1.0)) );
+}
+
+void main( void )
+{
+    vec4 baseMap = texture2D( BaseMap, TexCoord.st * uvScale + uvOffset );
+
+    vec4 color;
+
+    vec3 normal = N;
+
+    // Reconstructed normal
+    //normal = normalize(cross(dFdy(v.xyz), dFdx(v.xyz)));
+
+    //if ( !doubleSided && !gl_FrontFacing ) { return; }
+
+    vec3 E = normalize(ViewDir);
+
+    float tmp2 = falloffDepth; // Unused right now
+
+    // Falloff
+    float falloff = 1.0;
+    if ( useFalloff ) {
+        float startO = min(falloffParams.z, 1.0);
+        float stopO = max(falloffParams.w, 0.0);
+
+        // TODO: When X and Y are both 0.0 or both 1.0 the effect is reversed.
+        falloff = smoothstep( falloffParams.y, falloffParams.x, abs(E.b));
+
+        falloff = mix( max(falloffParams.w, 0.0), min(falloffParams.z, 1.0), falloff );
+    }
+
+    float alphaMult = glowColor.a * glowColor.a;
+
+    color.rgb = baseMap.rgb;
+    color.a = baseMap.a;
+
+    if ( hasWeaponBlood ) {
+        color.rgb = vec3( 1.0, 0.0, 0.0 ) * baseMap.r;
+        color.a = baseMap.a * baseMap.g;
+    }
+
+    color.rgb *= C.rgb * glowColor.rgb;
+    color.a *= C.a * falloff * alphaMult;
+
+    if ( greyscaleColor ) {
+        // Only Red emissive channel is used
+        float emRGB = glowColor.r;
+
+        vec4 luG = colorLookup( baseMap.g, C.g * falloff * emRGB );
+
+        color.rgb = luG.rgb;
+    }
+
+    if ( greyscaleAlpha ) {
+        vec4 luA = colorLookup( baseMap.a, C.a * falloff * alphaMult );
+
+        color.a = luA.a;
+    }
+
+    gl_FragColor.rgb = color.rgb * glowMult;
+    gl_FragColor.a = color.a;
+}
diff --git a/libs/preview_nif/data/shaders/sk_effectshader.vert b/libs/preview_nif/data/shaders/sk_effectshader.vert
new file mode 100644
index 0000000..3204cba
--- /dev/null
+++ b/libs/preview_nif/data/shaders/sk_effectshader.vert
@@ -0,0 +1,46 @@
+#version 120
+
+uniform mat4 modelViewMatrix;
+uniform mat4 mvpMatrix;
+uniform mat3 normalMatrix;
+uniform vec3 lightDirection;
+uniform vec4 ambientColor;
+uniform vec4 diffuseColor;
+
+attribute vec3 position;
+attribute vec3 normal;
+attribute vec3 tangent;
+attribute vec3 bitangent;
+attribute vec2 texCoord;
+attribute vec4 color;
+
+varying vec2 TexCoord;
+varying vec3 LightDir;
+varying vec3 ViewDir;
+
+varying vec4 C;
+
+varying vec3 N;
+varying vec3 t;
+varying vec3 b;
+varying vec3 v;
+
+void main( void )
+{
+    gl_Position = mvpMatrix * vec4(position, 1);
+    TexCoord = texCoord;
+
+    N = normalize(normalMatrix * normal);
+    t = normalize(normalMatrix * tangent);
+    b = normalize(normalMatrix * bitangent);
+    v = vec3(modelViewMatrix * vec4(position, 1));
+
+    mat3 tbnMatrix = mat3(b.x, t.x, N.x,
+                          b.y, t.y, N.y,
+                          b.z, t.z, N.z);
+
+    ViewDir = tbnMatrix * -v.xyz;
+    LightDir = tbnMatrix * lightDirection.xyz;
+
+    C = color;
+}
diff --git a/libs/preview_nif/data/shaders/sk_msn.frag b/libs/preview_nif/data/shaders/sk_msn.frag
new file mode 100644
index 0000000..3ebbf93
--- /dev/null
+++ b/libs/preview_nif/data/shaders/sk_msn.frag
@@ -0,0 +1,194 @@
+#version 120
+
+uniform sampler2D BaseMap;
+uniform sampler2D NormalMap;
+uniform sampler2D SpecularMap;
+uniform sampler2D LightMask;
+uniform sampler2D TintMask;
+uniform sampler2D DetailMask;
+uniform sampler2D BacklightMap;
+
+uniform vec3 specColor;
+uniform float specStrength;
+uniform float specGlossiness;
+
+uniform vec3 glowColor;
+uniform float glowMult;
+
+uniform float alpha;
+
+uniform vec3 tintColor;
+
+uniform vec2 uvScale;
+uniform vec2 uvOffset;
+
+uniform bool hasEmit;
+uniform bool hasSoftlight;
+uniform bool hasBacklight;
+uniform bool hasRimlight;
+uniform bool hasSpecularMap;
+uniform bool hasDetailMask;
+uniform bool hasTintMask;
+uniform bool hasTintColor;
+
+uniform float softlight;
+uniform float rimPower;
+
+uniform mat4 viewMatrix;
+
+varying vec3 v;
+
+varying vec2 TexCoord;
+varying vec3 LightDir;
+varying vec3 ViewDir;
+
+varying vec4 A;
+varying vec4 C;
+varying vec4 D;
+
+
+vec3 tonemap(vec3 x)
+{
+    float _A = 0.15;
+    float _B = 0.50;
+    float _C = 0.10;
+    float _D = 0.20;
+    float _E = 0.02;
+    float _F = 0.30;
+
+    return ((x*(_A*x+_C*_B)+_D*_E)/(x*(_A*x+_B)+_D*_F))-_E/_F;
+}
+
+vec3 toGrayscale(vec3 color)
+{
+    return vec3(dot(vec3(0.3, 0.59, 0.11), color));
+}
+
+float overlay( float base, float blend )
+{
+    float result;
+    if ( base < 0.5 ) {
+        result = 2.0 * base * blend;
+    } else {
+        result = 1.0 - 2.0 * (1.0 - blend) * (1.0 - base);
+    }
+    return result;
+}
+
+vec3 overlay( vec3 ba, vec3 bl )
+{
+    return vec3( overlay(ba.r, bl.r), overlay(ba.g, bl.g), overlay( ba.b, bl.b ) );
+}
+
+void main( void )
+{
+    vec2 offset = TexCoord.st * uvScale + uvOffset;
+
+    vec4 baseMap = texture2D( BaseMap, offset );
+    vec4 normalMap = texture2D( NormalMap, offset );
+
+    vec3 normal = normalMap.rgb * 2.0 - 1.0;
+
+    // Convert model space to view space
+    //    Swizzled G/B values!
+    normal = normalize( vec3( viewMatrix * vec4( normal.rbg, 0.0 )));
+
+    // Face Normals
+    //vec3 X = dFdx(v);
+    //vec3 Y = dFdy(v);
+    //vec3 constructedNormal = normalize(cross(X,Y));
+
+
+    vec3 L = normalize(LightDir);
+    vec3 E = normalize(ViewDir);
+    vec3 R = reflect(-L, normal);
+    vec3 H = normalize( L + E );
+
+    float NdotL = max( dot(normal, L), 0.0 );
+    float NdotH = max( dot(normal, H), 0.0 );
+    float EdotN = max( dot(normal, E), 0.0 );
+    float NdotNegL = max( dot(normal, -L), 0.0 );
+
+
+    vec4 color;
+    vec3 albedo = baseMap.rgb * C.rgb;
+    vec3 diffuse = A.rgb + (D.rgb * NdotL);
+
+
+    // Emissive
+    vec3 emissive = vec3(0.0);
+    if ( hasEmit ) {
+        emissive += glowColor * glowMult;
+    }
+
+    // Specular
+
+    float s = texture2D( SpecularMap, offset ).r;
+    if ( !hasSpecularMap || hasBacklight ) {
+        s = normalMap.a;
+    }
+
+    vec3 spec = clamp( specColor * specStrength * s * pow(NdotH, specGlossiness), 0.0, 1.0 );
+    spec *= D.rgb;
+
+
+    vec3 backlight = vec3(0.0);
+    if ( hasBacklight ) {
+        backlight = texture2D( BacklightMap, offset ).rgb;
+        backlight *= NdotNegL;
+
+        emissive += backlight * D.rgb;
+    }
+
+    vec4 mask = vec4(0.0);
+    if ( hasRimlight || hasSoftlight ) {
+        mask = texture2D( LightMask, offset );
+    }
+
+    vec3 rim = vec3(0.0);
+    if ( hasRimlight ) {
+        rim = mask.rgb * pow(vec3((1.0 - EdotN)), vec3(rimPower));
+        rim *= smoothstep( -0.2, 1.0, dot(-L, E) );
+
+        emissive += rim * D.rgb;
+    }
+
+    vec3 soft = vec3(0.0);
+    if ( hasSoftlight ) {
+        float wrap = (dot(normal, L) + softlight) / (1.0 + softlight);
+
+        soft = max( wrap, 0.0 ) * mask.rgb * smoothstep( 1.0, 0.0, NdotL );
+        soft *= sqrt( clamp( softlight, 0.0, 1.0 ) );
+
+        emissive += soft * D.rgb;
+    }
+
+    vec3 detail = vec3(0.0);
+    if ( hasDetailMask ) {
+        detail = texture2D( DetailMask, offset ).rgb;
+
+        albedo = overlay( albedo, detail );
+    }
+
+    vec3 tint = vec3(0.0);
+    if ( hasTintMask ) {
+        tint = texture2D( TintMask, offset ).rgb;
+
+        albedo = overlay( albedo, tint );
+    }
+
+    if ( hasDetailMask ) {
+        albedo += albedo;
+    }
+
+    if ( hasTintColor ) {
+        albedo *= tintColor;
+    }
+
+    color.rgb = albedo * (diffuse + emissive) + spec;
+    color.rgb = tonemap( color.rgb ) / tonemap( vec3(1.0) );
+    color.a = C.a * baseMap.a;
+
+    gl_FragColor = color;
+    gl_FragColor.a *= alpha;
+}
diff --git a/libs/preview_nif/data/shaders/sk_msn.vert b/libs/preview_nif/data/shaders/sk_msn.vert
new file mode 100644
index 0000000..755605f
--- /dev/null
+++ b/libs/preview_nif/data/shaders/sk_msn.vert
@@ -0,0 +1,41 @@
+#version 120
+
+uniform mat4 modelViewMatrix;
+uniform mat4 mvpMatrix;
+uniform mat3 normalMatrix;
+uniform vec3 lightDirection;
+uniform vec4 ambientColor;
+uniform vec4 diffuseColor;
+
+attribute vec3 position;
+attribute vec3 normal;
+attribute vec3 tangent;
+attribute vec3 bitangent;
+attribute vec2 texCoord;
+attribute vec4 color;
+
+varying vec2 TexCoord;
+varying vec3 LightDir;
+varying vec3 ViewDir;
+
+varying vec3 v;
+
+varying vec4 A;
+varying vec4 C;
+varying vec4 D;
+
+
+void main( void )
+{
+    gl_Position = mvpMatrix * vec4(position, 1);
+    TexCoord = texCoord;
+
+    v = vec3(modelViewMatrix * vec4(position, 1));
+
+    ViewDir = -v.xyz;
+    LightDir = lightDirection;
+
+    A = ambientColor;
+    C = color;
+    D = diffuseColor;
+}
diff --git a/libs/preview_nif/data/shaders/sk_multilayer.frag b/libs/preview_nif/data/shaders/sk_multilayer.frag
new file mode 100644
index 0000000..fc4afdb
--- /dev/null
+++ b/libs/preview_nif/data/shaders/sk_multilayer.frag
@@ -0,0 +1,216 @@
+#version 120
+
+uniform sampler2D BaseMap;
+uniform sampler2D NormalMap;
+uniform sampler2D LightMask;
+uniform sampler2D BacklightMap;
+uniform sampler2D InnerMap;
+uniform sampler2D EnvironmentMap;
+uniform samplerCube CubeMap;
+
+uniform vec3 specColor;
+uniform float specStrength;
+uniform float specGlossiness;
+
+uniform vec3 glowColor;
+uniform float glowMult;
+
+uniform float alpha;
+
+uniform vec2 uvScale;
+uniform vec2 uvOffset;
+
+uniform bool hasEmit;
+uniform bool hasSoftlight;
+uniform bool hasBacklight;
+uniform bool hasRimlight;
+uniform bool hasCubeMap;
+uniform bool hasEnvMask;
+
+uniform float softlight;
+uniform float rimPower;
+
+uniform vec2 innerScale;
+uniform float innerThickness;
+uniform float outerRefraction;
+uniform float outerReflection;
+
+uniform mat4 modelViewMatrixInverse;
+uniform mat4 worldMatrix;
+
+varying vec2 TexCoord;
+varying vec3 LightDir;
+varying vec3 ViewDir;
+
+varying vec4 A;
+varying vec4 C;
+varying vec4 D;
+
+varying vec3 N;
+varying vec3 t;
+varying vec3 b;
+
+
+vec3 tonemap(vec3 x)
+{
+    float _A = 0.15;
+    float _B = 0.50;
+    float _C = 0.10;
+    float _D = 0.20;
+    float _E = 0.02;
+    float _F = 0.30;
+
+    return ((x*(_A*x+_C*_B)+_D*_E)/(x*(_A*x+_B)+_D*_F))-_E/_F;
+}
+
+vec3 toGrayscale(vec3 color)
+{
+    return vec3(dot(vec3(0.3, 0.59, 0.11), color));
+}
+
+// Compute inner layer�s texture coordinate and transmission depth
+// vTexCoord: Outer layer�s texture coordinate
+// vInnerScale: Tiling of inner texture
+// vViewTS: View vector in tangent space
+// vNormalTS: Normal in tangent space (sampled normal map)
+// fLayerThickness: Distance from outer layer to inner layer
+vec3 ParallaxOffsetAndDepth( vec2 vTexCoord, vec2 vInnerScale, vec3 vViewTS, vec3 vNormalTS, float fLayerThickness )
+{
+    // Tangent space reflection vector
+    vec3 vReflectionTS = reflect( -vViewTS, vNormalTS );
+    // Tangent space transmission vector (reflect about surface plane)
+    vec3 vTransTS = vec3( vReflectionTS.xy, -vReflectionTS.z );
+
+    // Distance along transmission vector to intersect inner layer
+    float fTransDist = fLayerThickness / abs(vTransTS.z);
+
+    // Texel size
+    //     Bethesda's version does indeed seem to assume 1024, which is why they
+    //    introduced the additional parameter.
+    vec2 vTexelSize = vec2( 1.0/(1024.0 * vInnerScale.x), 1.0/(1024.0 * vInnerScale.y) );
+
+    // Inner layer�s texture coordinate due to parallax
+    vec2 vOffset = vTexelSize * fTransDist * vTransTS.xy;
+    vec2 vOffsetTexCoord = vTexCoord + vOffset;
+
+    // Return offset texture coordinate in xy and transmission dist in z
+    return vec3( vOffsetTexCoord, fTransDist );
+}
+
+void main( void )
+{
+    vec2 offset = TexCoord * uvScale + uvOffset;
+
+    vec4 baseMap = texture2D( BaseMap, offset );
+    vec4 normalMap = texture2D( NormalMap, offset );
+
+    vec3 normal = normalize(normalMap.rgb * 2.0 - 1.0);
+
+    // Sample the non-parallax offset alpha channel of the inner map
+    //    Used to modulate the innerThickness
+    float innerMapAlpha = texture2D( InnerMap, offset ).a;
+
+
+    vec3 L = normalize(LightDir);
+    vec3 E = normalize(ViewDir);
+    vec3 R = reflect(-L, normal);
+    vec3 H = normalize( L + E );
+
+    float NdotL = max( dot(normal, L), 0.0 );
+    float NdotH = max( dot(normal, H), 0.0 );
+    float EdotN = max( dot(normal, E), 0.0 );
+    float NdotNegL = max( dot(normal, -L), 0.0 );
+
+
+    // Mix between the face normal and the normal map based on the refraction scale
+    vec3 mixedNormal = mix( vec3(0.0, 0.0, 1.0), normal, clamp( outerRefraction, 0.0, 1.0 ) );
+    vec3 parallax = ParallaxOffsetAndDepth( offset, innerScale, E, mixedNormal, innerThickness * innerMapAlpha );
+
+    // Sample the inner map at the offset coords
+    vec4 innerMap = texture2D( InnerMap, parallax.xy * innerScale );
+
+    vec3 reflected = reflect( -E, normal );
+    vec3 reflectedVS = b * reflected.x + t * reflected.y + N * reflected.z;
+    vec3 reflectedWS = vec3( worldMatrix * (modelViewMatrixInverse * vec4( reflectedVS, 0.0 )) );
+
+
+    vec4 color;
+    vec3 albedo;
+    vec3 diffuse = A.rgb + (D.rgb * NdotL);
+    vec3 inner = innerMap.rgb * C.rgb;
+    vec3 outer = baseMap.rgb * C.rgb;
+
+
+    // Mix inner/outer layer based on fresnel
+    float outerMix = max( 1.0 - EdotN, baseMap.a );
+    albedo = mix( inner, outer, outerMix );
+
+
+    // Environment
+    if ( hasCubeMap ) {
+        vec4 cube = textureCube( CubeMap, reflectedWS );
+        cube.rgb *= outerReflection;
+
+        if ( hasEnvMask ) {
+            vec4 env = texture2D( EnvironmentMap, offset );
+            cube.rgb *= env.r;
+        } else {
+            cube.rgb *= normalMap.a;
+        }
+
+        albedo += cube.rgb;
+    }
+
+    // Specular
+    vec3 spec = clamp( specColor * specStrength * normalMap.a * pow(NdotH, specGlossiness), 0.0, 1.0 );
+    spec *= D.rgb;
+
+    // Emissive
+    //    Mixed with outer map
+    vec3 emissive = vec3(0.0);
+    if ( hasEmit ) {
+        emissive += glowColor * glowMult;
+    }
+
+    // Backlight
+    //     Mixed with inner and outer map
+    vec3 backlight = vec3(0.0);
+    if ( hasBacklight ) {
+        backlight = texture2D( BacklightMap, offset ).rgb;
+        backlight *= NdotNegL;
+
+        emissive += backlight * D.rgb;
+    }
+
+    // TODO: Test rim and soft light mixing with inner/outer layer
+
+    vec4 mask = vec4(0.0);
+    if ( hasRimlight || hasSoftlight ) {
+        mask = texture2D( LightMask, offset );
+    }
+
+    vec3 rim = vec3(0.0);
+    if ( hasRimlight ) {
+        rim = mask.rgb * pow(vec3((1.0 - EdotN)), vec3(rimPower));
+        rim *= smoothstep( -0.2, 1.0, dot(-L, E) );
+
+        emissive += rim * D.rgb;
+    }
+
+    vec3 soft = vec3(0.0);
+    if ( hasSoftlight ) {
+        float wrap = (dot(normal, L) + softlight) / (1.0 + softlight);
+
+        soft = max( wrap, 0.0 ) * mask.rgb * smoothstep( 1.0, 0.0, NdotL );
+        soft *= sqrt( clamp( softlight, 0.0, 1.0 ) );
+
+        emissive += soft * D.rgb;
+    }
+
+    color.rgb = albedo * (diffuse + emissive) + spec;
+    color.rgb = tonemap( color.rgb ) / tonemap( vec3(1.0) );
+    color.a = C.a * baseMap.a;
+
+    gl_FragColor = color;
+    gl_FragColor.a *= alpha;
+}
diff --git a/libs/preview_nif/plugindefinition.json b/libs/preview_nif/plugindefinition.json
new file mode 100644
index 0000000..d0d25c2
--- /dev/null
+++ b/libs/preview_nif/plugindefinition.json
@@ -0,0 +1,42 @@
+{
+    "Name": "Preview NIF",
+    "Author": "Parapets",
+    "Description": "Supports previewing NIF files",
+    "DocsUrl": "",
+    "GithubUrl": "https://github.com/Exit-9B/modorganizer-preview_nif",
+    "NexusUrl": "https://www.nexusmods.com/skyrimspecialedition/mods/69813",
+    "Versions": [
+        {
+            "Version": "0.2.0b",
+            "Released": "2023-11-27",
+            "MinSupport": "2.5.0",
+            "MaxSupport": "2.5.0",
+            "MinWorking": "2.5.0",
+            "MaxWorking": "",
+            "DownloadUrl": "https://github.com/Exit-9B/modorganizer-preview_nif/releases/download/v0.2.0/preview_nif-0.2.0.7z",
+            "PluginPath": [
+                "preview_nif.dll",
+                "data"
+            ],
+            "LocalePath": [],
+            "DataPath": [],
+            "ReleaseNotes": []
+        },
+        {
+            "Version": "0.1.8.1b",
+            "Released": "2022-06-24",
+            "MinSupport": "2.4.3",
+            "MaxSupport": "2.4.4",
+            "MinWorking": "2.4.3",
+            "MaxWorking": "2.4.5a3",
+            "DownloadUrl": "https://github.com/Exit-9B/modorganizer-preview_nif/releases/download/v0.1.8/preview_nif-0.1.8.1.7z",
+            "PluginPath": [
+                "preview_nif.dll",
+                "data"
+            ],
+            "LocalePath": [],
+            "DataPath": [],
+            "ReleaseNotes": []
+        }
+    ]
+}
diff --git a/libs/preview_nif/src/CMakeLists.txt b/libs/preview_nif/src/CMakeLists.txt
new file mode 100644
index 0000000..28bb30f
--- /dev/null
+++ b/libs/preview_nif/src/CMakeLists.txt
@@ -0,0 +1,36 @@
+cmake_minimum_required(VERSION 3.22)
+
+find_package(Qt6 CONFIG REQUIRED COMPONENTS Widgets OpenGL OpenGLWidgets)
+find_package(fmt CONFIG REQUIRED)
+
+file(GLOB preview_nif_SOURCES CONFIGURE_DEPENDS
+    ${CMAKE_CURRENT_SOURCE_DIR}/*.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/*.h
+)
+
+add_library(preview_nif SHARED ${preview_nif_SOURCES})
+
+mo2_configure_plugin(preview_nif NO_SOURCES WARNINGS OFF)
+
+target_include_directories(preview_nif PRIVATE
+    ${CMAKE_SOURCE_DIR}/libs/uibase/include/uibase/game_features
+    ${CMAKE_SOURCE_DIR}/libs/libbsarch/include/libbsarch
+)
+
+target_link_libraries(preview_nif PRIVATE
+    mo2::uibase
+    libbsarch
+    Qt6::Widgets
+    Qt6::OpenGL
+    Qt6::OpenGLWidgets
+    fmt::fmt
+)
+
+mo2_install_plugin(preview_nif)
+
+# Stage shader files next to the plugin under plugins/data/shaders/.
+install(
+    DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/../data/shaders
+    DESTINATION plugins/data
+    FILES_MATCHING PATTERN "*.vert" PATTERN "*.frag"
+)
diff --git a/libs/preview_nif/src/Camera.cpp b/libs/preview_nif/src/Camera.cpp
new file mode 100644
index 0000000..0a9ce73
--- /dev/null
+++ b/libs/preview_nif/src/Camera.cpp
@@ -0,0 +1,50 @@
+#include "Camera.h"
+
+#include <cmath>
+
+void Camera::setDistance(float distance)
+{
+    m_Distance = qBound(MinDistance, distance, MaxDistance);
+    cameraMoved();
+}
+
+void Camera::setLookAt(QVector3D lookAt)
+{
+    m_LookAt = lookAt;
+    cameraMoved();
+}
+
+void Camera::pan(QVector3D distance)
+{
+    m_LookAt += distance;
+    cameraMoved();
+}
+
+void Camera::rotate(float yaw, float pitch)
+{
+    m_Yaw = repeat(m_Yaw + yaw, 0.0f, 360.0f);
+    m_Pitch = repeat(m_Pitch + pitch, 0.0f, 360.0f);
+
+    cameraMoved();
+}
+
+void Camera::zoomDistance(float distance)
+{
+    m_Distance += distance;
+    m_Distance = qBound(MinDistance, m_Distance, MaxDistance);
+
+    cameraMoved();
+}
+
+void Camera::zoomFactor(float factor)
+{
+    m_Distance *= factor;
+    m_Distance = qBound(MinDistance, m_Distance, MaxDistance);
+
+    cameraMoved();
+}
+
+float Camera::repeat(float value, float min, float max)
+{
+    return fmod(fmod(value, max - min) + (max - min), max - min) + min;
+}
diff --git a/libs/preview_nif/src/Camera.h b/libs/preview_nif/src/Camera.h
new file mode 100644
index 0000000..3d685ea
--- /dev/null
+++ b/libs/preview_nif/src/Camera.h
@@ -0,0 +1,37 @@
+#pragma once
+
+#include <QObject>
+#include <QVector3D>
+
+class Camera : public QObject
+{
+    Q_OBJECT
+
+public:
+    QVector3D lookAt() { return m_LookAt; }
+    float pitch() { return m_Pitch; }
+    float yaw() { return m_Yaw; }
+    float distance() { return m_Distance; }
+
+    void setDistance(float distance);
+    void setLookAt(QVector3D lookAt);
+
+    void pan(QVector3D delta);
+    void rotate(float yaw, float pitch);
+    void zoomDistance(float distance);
+    void zoomFactor(float factor);
+
+private:
+    inline static constexpr float MinDistance = 1.0f;
+    inline static constexpr float MaxDistance = 5000.0f;
+
+    static float repeat(float value, float min, float max);
+
+    QVector3D m_LookAt;
+    float m_Pitch = 0.0f;
+    float m_Yaw = 0.0f;
+    float m_Distance = 100.0f;
+
+signals:
+    void cameraMoved();
+};
diff --git a/libs/preview_nif/src/NifExtensions.h b/libs/preview_nif/src/NifExtensions.h
new file mode 100644
index 0000000..cd529e5
--- /dev/null
+++ b/libs/preview_nif/src/NifExtensions.h
@@ -0,0 +1,236 @@
+#pragma once
+
+#include <QOpenGLFunctions>
+#include <NifFile.hpp>
+#include <cstdint>
+#include <cstring>
+
+struct SLSF1
+{
+    SLSF1() = delete;
+
+    enum BSLightingShaderFlags1 : std::uint32_t
+    {
+        Specular                = 1U << 0,
+        Skinned                 = 1U << 1,
+        TempRefraction          = 1U << 2,
+        VertexAlpha             = 1U << 3,
+        GreyscaleToPaletteColor = 1U << 4,
+        GreyscaleToPaletteAlpha = 1U << 5,
+        UseFalloff              = 1U << 6,
+        EnvironmentMapping      = 1U << 7,
+        ReceiveShadows          = 1U << 8,
+        CastShadows             = 1U << 9,
+        FacegenDetailMap        = 1U << 10,
+        Parallax                = 1U << 11,
+        ModelSpaceNormals       = 1U << 12,
+        NonProjectiveShadows    = 1U << 13,
+        Landscape               = 1U << 14,
+        Refraction              = 1U << 15,
+        FireRefraction          = 1U << 16,
+        EyeEnvironmentMapping   = 1U << 17,
+        HairSoftLighting        = 1U << 18,
+        ScreendoorAlphaFade     = 1U << 19,
+        LocalmapHideSecret      = 1U << 20,
+        FaceGenRGBTint          = 1U << 21,
+        OwnEmit                 = 1U << 22,
+        ProjectedUV             = 1U << 23,
+        MultipleTextures        = 1U << 24,
+        RemappableTextures      = 1U << 25,
+        Decal                   = 1U << 26,
+        DynamicDecal            = 1U << 27,
+        ParallaxOcclusion       = 1U << 28,
+        ExternalEmittance       = 1U << 29,
+        SoftEffect              = 1U << 30,
+        ZBufferTest             = 1U << 31,
+    };
+};
+
+struct SLSF2
+{
+    SLSF2() = delete;
+
+    enum BSLightingShaderFlags2 : std::uint32_t
+    {
+        ZBufferWrite                = 1U << 0,
+        LODLandscape                = 1U << 1,
+        LODObjects                  = 1U << 2,
+        NoFade                      = 1U << 3,
+        DoubleSided                 = 1U << 4,
+        VertexColors                = 1U << 5,
+        GlowMap                     = 1U << 6,
+        AssumeShadowmask            = 1U << 7,
+        PackedTangent               = 1U << 8,
+        MultiIndexSnow              = 1U << 9,
+        VertexLighting              = 1U << 10,
+        UniformScale                = 1U << 11,
+        FitSlope                    = 1U << 12,
+        Billboard                   = 1U << 13,
+        NoLODLandBlend              = 1U << 14,
+        EnvMapLightFade             = 1U << 15,
+        Wireframe                   = 1U << 16,
+        WeaponBlood                 = 1U << 17,
+        HideOnLocalMap              = 1U << 18,
+        PremultAlpha                = 1U << 19,
+        CloudLOD                    = 1U << 20,
+        AnisotropicLighting         = 1U << 21,
+        NoTransparencyMultisampling = 1U << 22,
+        Unused01                    = 1U << 23,
+        MultiLayerParallax          = 1U << 24,
+        SoftLighting                = 1U << 25,
+        RimLighting                 = 1U << 26,
+        BackLighting                = 1U << 27,
+        Unused02                    = 1U << 28,
+        TreeAnim                    = 1U << 29,
+        EffectLighting              = 1U << 30,
+        HDLODObjects                = 1U << 31,
+    };
+};
+
+struct TriShape
+{
+    TriShape() = delete;
+
+    enum NiAVObjectFlags : std::uint32_t
+    {
+        Hidden                            = 1U << 0,
+        SelectiveUpdate                   = 1U << 1,
+        SelectiveUpdateTransforms         = 1U << 2,
+        SelectiveUpdateController         = 1U << 3,
+        SelectiveUpdateRigid              = 1U << 4,
+        DisplayUIObject                   = 1U << 5,
+        DisableSorting                    = 1U << 6,
+        SelectiveUpdateTransformsOverride = 1U << 7,
+        SaveExternalGeomData              = 1U << 9,
+        NoDecals                          = 1U << 10,
+        AlwaysDraw                        = 1U << 11,
+        MeshLODFO4                        = 1U << 12,
+        FixedBound                        = 1U << 13,
+        TopFadeNode                       = 1U << 14,
+        IgnoreFade                        = 1U << 15,
+        NoAnimSyncX                       = 1U << 16,
+        NoAnimSyncY                       = 1U << 17,
+        NoAnimSyncZ                       = 1U << 18,
+        NoAnimSyncS                       = 1U << 19,
+        NoDismember                       = 1U << 20,
+        NoDismemberValidity               = 1U << 21,
+        RenderUse                         = 1U << 22,
+        MaterialsApplied                  = 1U << 23,
+        HighDetail                        = 1U << 24,
+        ForceUpdate                       = 1U << 25,
+        PreProcessedNode                  = 1U << 26,
+        MeshLODSkyrim                     = 1U << 27,
+    };
+};
+
+struct NiAlphaPropertyFlags
+{
+public:
+    NiAlphaPropertyFlags(std::uint16_t flags = 0)
+    {
+        std::memcpy(this, &flags, sizeof(NiAlphaPropertyFlags));
+    }
+
+    bool isAlphaBlendEnabled()
+    {
+        return m_AlphaBlendEnable;
+    }
+
+    GLenum sourceBlendingFactor()
+    {
+        return getBlendMode(m_SrcBlendMode);
+    }
+
+    GLenum destinationBlendingFactor()
+    {
+        return getBlendMode(m_DstBlendMode);
+    }
+
+    bool isAlphaTestEnabled()
+    {
+        return m_AlphaTestEnable;
+    }
+
+    GLenum alphaTestMode()
+    {
+        return getTestMode(m_AlphaTestMode);
+    }
+
+    bool isTriangleSortDisabled()
+    {
+        return m_NoSort;
+    }
+
+private:
+    static std::uint32_t getBlendMode(std::uint16_t flags)
+    {
+        switch (flags) {
+            case 0: return GL_ONE;
+            case 1: return GL_ZERO;
+            case 2: return GL_SRC_COLOR;
+            case 3: return GL_ONE_MINUS_SRC_COLOR;
+            case 4: return GL_DST_COLOR;
+            case 5: return GL_ONE_MINUS_DST_COLOR;
+            case 6: return GL_SRC_ALPHA;
+            case 7: return GL_ONE_MINUS_SRC_ALPHA;
+            case 8: return GL_DST_ALPHA;
+            case 9: return GL_ONE_MINUS_DST_ALPHA;
+            default: return GL_ONE;
+        };
+    }
+
+    static std::uint32_t getTestMode(std::uint16_t flags)
+    {
+        switch (flags) {
+            case 0: return GL_ALWAYS;
+            case 1: return GL_LESS;
+            case 2: return GL_EQUAL;
+            case 3: return GL_LEQUAL;
+            case 4: return GL_GREATER;
+            case 5: return GL_NOTEQUAL;
+            case 6: return GL_GEQUAL;
+            case 7: return GL_NEVER;
+            default: return GL_ALWAYS;
+        }
+    };
+
+    std::uint16_t m_AlphaBlendEnable : 1;
+    std::uint16_t m_SrcBlendMode : 4;
+    std::uint16_t m_DstBlendMode : 4;
+    std::uint16_t m_AlphaTestEnable : 1;
+    std::uint16_t m_AlphaTestMode : 3;
+    std::uint16_t m_NoSort : 1;
+};
+static_assert(sizeof(NiAlphaPropertyFlags) == 2);
+
+inline nifly::MatTransform GetShapeTransformToGlobal(
+    nifly::NifFile* nifFile,
+    nifly::NiShape* niShape)
+{
+    nifly::MatTransform xform = niShape->GetTransformToParent();
+    nifly::NiNode* parent = nifFile->GetParentNode(niShape);
+    while (parent) {
+        xform = parent->GetTransformToParent().ComposeTransforms(xform);
+        parent = nifFile->GetParentNode(parent);
+    }
+
+    return xform;
+}
+
+inline nifly::BoundingSphere GetBoundingSphere(
+    nifly::NifFile* nifFile,
+    nifly::NiShape* niShape)
+{
+    if (auto vertices = nifFile->GetVertsForShape(niShape)) {
+        auto bounds = nifly::BoundingSphere(*vertices);
+
+        auto xform = GetShapeTransformToGlobal(nifFile, niShape);
+
+        bounds.center = xform.ApplyTransform(bounds.center);
+        bounds.radius = xform.ApplyTransformToDist(bounds.radius);
+        return bounds;
+    }
+    else {
+        return nifly::BoundingSphere();
+    }
+}
diff --git a/libs/preview_nif/src/NifWidget.cpp b/libs/preview_nif/src/NifWidget.cpp
new file mode 100644
index 0000000..d224d04
--- /dev/null
+++ b/libs/preview_nif/src/NifWidget.cpp
@@ -0,0 +1,254 @@
+#include "NifWidget.h"
+#include "NifExtensions.h"
+
+#include <QMouseEvent>
+#include <QWheelEvent>
+#include <QOpenGLContext>
+#include <QOpenGLFunctions_2_1>
+#include <QOpenGLVersionFunctionsFactory>
+using OpenGLFunctions = QOpenGLFunctions_2_1;
+
+NifWidget::NifWidget(
+    std::shared_ptr<nifly::NifFile> nifFile,
+    MOBase::IOrganizer* moInfo,
+    bool debugContext,
+    QWidget* parent,
+    Qt::WindowFlags f)
+    : QOpenGLWidget(parent, f),
+      m_NifFile{ nifFile },
+      m_MOInfo{ moInfo },
+      m_TextureManager{ std::make_unique<TextureManager>(moInfo) },
+      m_ShaderManager{ std::make_unique<ShaderManager>(moInfo) }
+{
+    QSurfaceFormat format;
+    // CompatibilityProfile — CoreProfile only exists for 3.2+, so the old
+    // CoreProfile+2.1 combo was getting silently downgraded, leaving Qt
+    // to pick a driver path we don't control. Compatibility 2.1 is the
+    // actual legal pair for the fixed-function bits this widget uses.
+    format.setVersion(2, 1);
+    format.setProfile(QSurfaceFormat::CompatibilityProfile);
+    format.setSwapBehavior(QSurfaceFormat::DoubleBuffer);
+    format.setSwapInterval(1);
+    format.setDepthBufferSize(24);
+    // RGBX framebuffer — no alpha channel so compositor can't see through.
+    format.setAlphaBufferSize(0);
+
+    if (debugContext) {
+        format.setOption(QSurfaceFormat::DebugContext);
+        m_Logger = new QOpenGLDebugLogger(this);
+    }
+
+    setFormat(format);
+}
+
+NifWidget::~NifWidget()
+{
+    cleanup();
+}
+
+void NifWidget::mousePressEvent(QMouseEvent* event)
+{
+    m_MousePos = event->globalPosition().toPoint();
+}
+
+void NifWidget::mouseMoveEvent(QMouseEvent* event)
+{
+    auto pos = event->globalPosition().toPoint();
+    auto delta = pos - m_MousePos;
+    m_MousePos = pos;
+
+    switch (event->buttons()) {
+    case Qt::LeftButton:
+    {
+        m_Camera->rotate(delta.x() * 0.5, delta.y() * 0.5);
+    } break;
+    case Qt::MiddleButton:
+    {
+        float viewDX = m_Camera->distance() / m_ViewportWidth;
+        float viewDY = m_Camera->distance() / m_ViewportHeight;
+
+        QMatrix4x4 r;
+        r.rotate(-m_Camera->yaw(), 0.0f, 1.0f, 0.0f);
+        r.rotate(-m_Camera->pitch(), 1.0f, 0.0f, 0.0f);
+
+        auto pan = r * QVector4D(-delta.x() * viewDX, delta.y() * viewDY, 0.0f, 0.0f);
+
+        m_Camera->pan(QVector3D(pan));
+    } break;
+    case Qt::RightButton:
+    {
+        if (event->modifiers() == Qt::ShiftModifier) {
+            m_Camera->zoomDistance(delta.y() * 0.1f);
+        }
+    } break;
+    }
+}
+
+void NifWidget::wheelEvent(QWheelEvent* event)
+{
+    m_Camera->zoomFactor(1.0f - (event->angleDelta().y() / 120.0f * 0.38f));
+}
+
+void NifWidget::initializeGL()
+{
+    if (m_Logger) {
+        m_Logger->initialize();
+        connect(
+            m_Logger,
+            &QOpenGLDebugLogger::messageLogged,
+            this,
+            [](const QOpenGLDebugMessage& debugMessage){
+                auto msg = tr("OpenGL debug message: %1").arg(debugMessage.message());
+                qDebug(qUtf8Printable(msg));
+            });
+    }
+
+    auto shapes = m_NifFile->GetShapes();
+    for (auto& shape : shapes) {
+        if (shape->flags & TriShape::Hidden) {
+            continue;
+        }
+
+        m_GLShapes.emplace_back(m_NifFile.get(), shape, m_TextureManager.get());
+    }
+
+    m_Camera = SharedCamera;
+    if (m_Camera.isNull()) {
+        m_Camera = { new Camera(), &Camera::deleteLater };
+        SharedCamera = m_Camera;
+
+        float largestRadius = 0.0f;
+        for (auto& shape : shapes) {
+            auto bounds = GetBoundingSphere(m_NifFile.get(), shape);
+
+            if (bounds.radius > largestRadius) {
+                largestRadius = bounds.radius;
+
+                m_Camera->setDistance(bounds.radius * 2.4f);
+                m_Camera->setLookAt({ -bounds.center.x, bounds.center.z, bounds.center.y });
+            }
+        }
+    }
+
+    updateCamera();
+
+    connect(
+        m_Camera.get(),
+        &Camera::cameraMoved,
+        this,
+        [this](){
+            updateCamera();
+            update();
+        });
+
+    auto f = QOpenGLVersionFunctionsFactory::get<QOpenGLFunctions_2_1>(
+        QOpenGLContext::currentContext());
+
+    f->glEnable(GL_DEPTH_TEST);
+    f->glDepthFunc(GL_LEQUAL);
+    f->glClearColor(0.18, 0.18, 0.18, 1.0);
+
+    // Persistent polygon offset state — actual per-shape bias is set in
+    // paintGL() by draw order so coplanar overlays tie-break deterministically.
+    f->glEnable(GL_POLYGON_OFFSET_FILL);
+}
+
+void NifWidget::paintGL()
+{
+    auto f = QOpenGLVersionFunctionsFactory::get<QOpenGLFunctions_2_1>(
+        QOpenGLContext::currentContext());
+
+    // Force the framebuffer to be fully opaque. Sequence:
+    //   1. Unmask alpha + clear → writes RGB=dark grey, A=1.0
+    //   2. Mask alpha off → subsequent shape draws can't touch FB alpha
+    // Without this, alpha-blended shapes mutate FB alpha and Qt composites
+    // the dialog background through the preview area (see-through bug).
+    f->glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
+    f->glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    f->glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_FALSE);
+
+    for (auto& shape : m_GLShapes) {
+        // Small polygon offset only on decal-flagged shapes to break z-ties
+        // with their coincident base mesh. Progressive/large offsets push
+        // depth out of the valid [0,1] range at far camera distances,
+        // which culls decals (the moss/road at zoom-out bug).
+        if (shape.isDecal) {
+            f->glPolygonOffset(-1.0f, -1.0f);
+        } else {
+            f->glPolygonOffset(0.0f, 0.0f);
+        }
+
+        auto program = m_ShaderManager->getProgram(shape.shaderType);
+        if (program && program->isLinked() && program->bind()) {
+            auto binder = QOpenGLVertexArrayObject::Binder(shape.vertexArray);
+
+            auto& modelMatrix = shape.modelMatrix;
+            auto modelViewMatrix = m_ViewMatrix * modelMatrix;
+            auto mvpMatrix = m_ProjectionMatrix * modelViewMatrix;
+
+            program->setUniformValue("worldMatrix", modelMatrix);
+            program->setUniformValue("viewMatrix", m_ViewMatrix);
+            program->setUniformValue("modelViewMatrix", modelViewMatrix);
+            program->setUniformValue("modelViewMatrixInverse", modelViewMatrix.inverted());
+            program->setUniformValue("normalMatrix", modelViewMatrix.normalMatrix());
+            program->setUniformValue("mvpMatrix", mvpMatrix);
+            program->setUniformValue("lightDirection", QVector3D(0, 0, 1));
+
+            shape.setupShaders(program);
+
+            if (shape.indexBuffer && shape.indexBuffer->isCreated()) {
+                shape.indexBuffer->bind();
+                f->glDrawElements(GL_TRIANGLES, shape.elements, GL_UNSIGNED_SHORT, nullptr);
+                shape.indexBuffer->release();
+            }
+
+            program->release();
+        }
+    }
+}
+
+void NifWidget::resizeGL(int w, int h)
+{
+    QMatrix4x4 m;
+    m.perspective(40.0f, static_cast<float>(w) / h, 0.1f, 10000.0f);
+
+    m_ProjectionMatrix = m;
+    m_ViewportWidth = w;
+    m_ViewportHeight = h;
+}
+
+void NifWidget::cleanup()
+{
+    // Must run from ~NifWidget (not from the QOpenGLContext::aboutToBeDestroyed
+    // signal), because the signal fires after derived-class members have
+    // already been torn down — iterating m_GLShapes from a signal slot then
+    // walks freed memory. Keep cleanup synchronous in the dtor.
+    if (!context()) {
+        return;
+    }
+
+    makeCurrent();
+
+    for (auto& shape : m_GLShapes) {
+        shape.destroy();
+    }
+    m_GLShapes.clear();
+
+    m_TextureManager->cleanup();
+}
+
+void NifWidget::updateCamera()
+{
+    QMatrix4x4 m;
+    m.translate(0.0f, 0.0f, -m_Camera->distance());
+    m.rotate(m_Camera->pitch(), 1.0f, 0.0f, 0.0f);
+    m.rotate(m_Camera->yaw(), 0.0f, 1.0f, 0.0f);
+    m.translate(-m_Camera->lookAt());
+    m *= QMatrix4x4{
+        -1, 0, 0, 0,
+         0, 0, 1, 0,
+         0, 1, 0, 0,
+         0, 0, 0, 1,
+    };
+    m_ViewMatrix = m;
+}
diff --git a/libs/preview_nif/src/NifWidget.h b/libs/preview_nif/src/NifWidget.h
new file mode 100644
index 0000000..34f2de0
--- /dev/null
+++ b/libs/preview_nif/src/NifWidget.h
@@ -0,0 +1,71 @@
+#pragma once
+
+#include "Camera.h"
+#include "OpenGLShape.h"
+#include "ShaderManager.h"
+#include "TextureManager.h"
+
+#include <QOpenGLBuffer>
+#include <QOpenGLDebugLogger>
+#include <QOpenGLShaderProgram>
+#include <QOpenGLVertexArrayObject>
+#include <QOpenGLWidget>
+#include <QSharedPointer>
+
+#include <imoinfo.h>
+#include <NifFile.hpp>
+
+#include <memory>
+
+class NifWidget : public QOpenGLWidget
+{
+    Q_OBJECT
+
+public:
+    NifWidget(
+        std::shared_ptr<nifly::NifFile> nifFile,
+        MOBase::IOrganizer* organizer,
+        bool debugContext = false,
+        QWidget* parent = nullptr,
+        Qt::WindowFlags f = {0});
+
+    ~NifWidget();
+    NifWidget(const NifWidget&) = delete;
+    NifWidget(NifWidget&&) = delete;
+    NifWidget& operator=(const NifWidget&) = delete;
+    NifWidget& operator=(NifWidget&&) = delete;
+
+protected:
+    void mousePressEvent(QMouseEvent* event) override;
+    void mouseMoveEvent(QMouseEvent* event) override;
+    void wheelEvent(QWheelEvent* event) override;
+
+    void initializeGL() override;
+    void paintGL() override;
+    void resizeGL(int w, int h) override;
+
+private:
+    void cleanup();
+    void updateCamera();
+
+    inline static QWeakPointer<Camera> SharedCamera;
+
+    std::shared_ptr<nifly::NifFile> m_NifFile;
+    MOBase::IOrganizer* m_MOInfo = nullptr;
+
+    std::unique_ptr<TextureManager> m_TextureManager;
+    std::unique_ptr<ShaderManager> m_ShaderManager;
+
+    QOpenGLDebugLogger* m_Logger = nullptr;
+
+    std::vector<OpenGLShape> m_GLShapes;
+
+    QSharedPointer<Camera> m_Camera;
+
+    QMatrix4x4 m_ViewMatrix;
+    QMatrix4x4 m_ProjectionMatrix;
+
+    int m_ViewportWidth;
+    int m_ViewportHeight;
+    QPoint m_MousePos;
+};
diff --git a/libs/preview_nif/src/OpenGLShape.cpp b/libs/preview_nif/src/OpenGLShape.cpp
new file mode 100644
index 0000000..ac7e678
--- /dev/null
+++ b/libs/preview_nif/src/OpenGLShape.cpp
@@ -0,0 +1,403 @@
+#include "OpenGLShape.h"
+#include "NifExtensions.h"
+
+#include <QOpenGLContext>
+#include <QOpenGLFunctions_2_1>
+#include <QOpenGLVersionFunctionsFactory>
+
+template <typename T>
+inline static QOpenGLBuffer* makeVertexBuffer(const std::vector<T>* data, GLuint attrib)
+{
+    QOpenGLBuffer* buffer = nullptr;
+
+    if (data) {
+        buffer = new QOpenGLBuffer(QOpenGLBuffer::VertexBuffer);
+        if (buffer->create() && buffer->bind()) {
+            buffer->allocate(data->data(), data->size() * sizeof(T));
+
+            auto f = QOpenGLVersionFunctionsFactory::get<QOpenGLFunctions_2_1>(
+                QOpenGLContext::currentContext());
+
+            f->glEnableVertexAttribArray(attrib);
+
+            f->glVertexAttribPointer(attrib, sizeof(T) / sizeof(float), GL_FLOAT,
+                                     GL_FALSE, sizeof(T), nullptr);
+
+            buffer->release();
+        }
+    }
+
+    return buffer;
+}
+
+OpenGLShape::OpenGLShape(nifly::NifFile* nifFile, nifly::NiShape* niShape,
+                         TextureManager* textureManager)
+{
+    auto f = QOpenGLVersionFunctionsFactory::get<QOpenGLFunctions_2_1>(
+        QOpenGLContext::currentContext());
+
+    auto shader   = nifFile->GetShader(niShape);
+    auto& version = nifFile->GetHeader().GetVersion();
+    if (version.IsFO4()) {
+        if (shader && shader->HasType<nifly::BSEffectShaderProperty>()) {
+            shaderType = ShaderManager::FO4EffectShader;
+        }
+        else {
+            shaderType = ShaderManager::FO4Default;
+        }
+    }
+    else {
+        if (shader && shader->HasType<nifly::BSEffectShaderProperty>()) {
+            shaderType = ShaderManager::SKEffectShader;
+        }
+        else {
+            if (shader && shader->IsModelSpace()) {
+                shaderType = ShaderManager::SKMSN;
+            }
+            else if (shader &&
+                     shader->GetShaderType() == nifly::BSLSP_MULTILAYERPARALLAX) {
+                shaderType = ShaderManager::SKMultilayer;
+            }
+            else {
+                shaderType = ShaderManager::SKDefault;
+            }
+        }
+    }
+
+    vertexArray = new QOpenGLVertexArrayObject();
+    vertexArray->create();
+    auto binder = QOpenGLVertexArrayObject::Binder(vertexArray);
+
+    auto xform  = GetShapeTransformToGlobal(nifFile, niShape);
+    modelMatrix = convertTransform(xform);
+
+    f->glVertexAttrib2f(AttribTexCoord, 0.0f, 0.0f);
+    f->glVertexAttrib4f(AttribColor, 1.0f, 1.0f, 1.0f, 1.0f);
+
+    // AMD GPU fails to render without vertex data
+    if (!niShape->HasNormals()) {
+        niShape->SetNormals(true);
+        if (auto geomData = niShape->GetGeomData()) {
+            geomData->RecalcNormals();
+        }
+    }
+
+    if (!niShape->HasTangents()) {
+        niShape->SetTangents(true);
+        if (auto geomData = niShape->GetGeomData()) {
+            geomData->CalcTangentSpace();
+        }
+    }
+
+    if (!niShape->HasUVs()) {
+        niShape->SetUVs(true);
+    }
+
+    if (!niShape->HasVertexColors()) {
+        niShape->SetVertexColors(true);
+    }
+
+    if (auto verts = nifFile->GetVertsForShape(niShape)) {
+        vertexBuffers[AttribPosition] = makeVertexBuffer(verts, AttribPosition);
+    }
+
+    if (auto normals = nifFile->GetNormalsForShape(niShape)) {
+        vertexBuffers[AttribNormal] = makeVertexBuffer(normals, AttribNormal);
+    }
+
+    if (auto tangents = nifFile->GetTangentsForShape(niShape)) {
+        vertexBuffers[AttribTangent] = makeVertexBuffer(tangents, AttribTangent);
+    }
+
+    if (auto bitangents = nifFile->GetBitangentsForShape(niShape)) {
+        vertexBuffers[AttribBitangent] = makeVertexBuffer(bitangents, AttribBitangent);
+    }
+
+    if (auto uvs = nifFile->GetUvsForShape(niShape)) {
+        vertexBuffers[AttribTexCoord] = makeVertexBuffer(uvs, AttribTexCoord);
+    }
+
+    if (std::vector<nifly::Color4> colors;
+        nifFile->GetColorsForShape(niShape, colors)) {
+        vertexBuffers[AttribColor] = makeVertexBuffer(&colors, AttribColor);
+    }
+
+    indexBuffer = new QOpenGLBuffer(QOpenGLBuffer::IndexBuffer);
+    if (indexBuffer->create() && indexBuffer->bind()) {
+
+        if (std::vector<nifly::Triangle> tris; niShape->GetTriangles(tris)) {
+            indexBuffer->allocate(tris.data(), tris.size() * sizeof(nifly::Triangle));
+        }
+
+        elements = niShape->GetNumTriangles() * 3;
+        indexBuffer->release();
+    }
+
+    if (shader) {
+        if (shader->HasTextureSet()) {
+            auto textureSetRef = shader->TextureSetRef();
+            auto textureSet    = nifFile->GetHeader().GetBlock(textureSetRef);
+
+            for (std::size_t i = 0; i < textureSet->textures.size(); i++) {
+                auto texturePath = textureSet->textures[i].get();
+                if (!texturePath.empty()) {
+                    textures[i] = textureManager->getTexture(texturePath);
+                }
+
+                if (textures[i] == nullptr) {
+                    switch (i) {
+                    case TextureSlot::BaseMap:
+                        textures[i] = textureManager->getErrorTexture();
+                        break;
+                    case TextureSlot::NormalMap:
+                        textures[i] = textureManager->getFlatNormalTexture();
+                        break;
+                    case TextureSlot::GlowMap:
+                        if (shader->HasGlowmap()) {
+                            textures[i] = textureManager->getBlackTexture();
+                        }
+                        else {
+                            textures[i] = textureManager->getWhiteTexture();
+                        }
+                        break;
+                    default:
+                        textures[i] = nullptr;
+                        break;
+                    }
+                }
+            }
+        }
+
+        specColor      = convertVector3(shader->GetSpecularColor());
+        specStrength   = shader->GetSpecularStrength();
+        specGlossiness = qBound(0.0f, shader->GetGlossiness(), 128.0f);
+        fresnelPower   = shader->GetFresnelPower();
+        paletteScale   = shader->GetGrayscaleToPaletteScale();
+
+        hasGlowMap = shader->HasGlowmap();
+        glowColor  = convertColor(shader->GetEmissiveColor());
+        glowMult   = shader->GetEmissiveMultiple();
+
+        alpha    = shader->GetAlpha();
+        uvScale  = convertVector2(shader->GetUVScale());
+        uvOffset = convertVector2(shader->GetUVOffset());
+
+        hasEmit      = shader->IsEmissive();
+        hasSoftlight = shader->HasSoftlight();
+        hasBacklight = shader->HasBacklight();
+        hasRimlight  = shader->HasRimlight();
+
+        softlight      = shader->GetSoftlight();
+        backlightPower = shader->GetBacklightPower();
+        rimPower       = shader->GetRimlightPower();
+        doubleSided    = shader->IsDoubleSided();
+        envReflection  = shader->GetEnvironmentMapScale();
+
+        if (auto alphaProperty = nifFile->GetAlphaProperty(niShape)) {
+
+            NiAlphaPropertyFlags flags = alphaProperty->flags;
+
+            alphaBlendEnable = flags.isAlphaBlendEnabled();
+            srcBlendMode     = flags.sourceBlendingFactor();
+            dstBlendMode     = flags.destinationBlendingFactor();
+            alphaTestEnable  = flags.isAlphaTestEnabled();
+            alphaTestMode    = flags.alphaTestMode();
+
+            alphaThreshold = alphaProperty->threshold / 255.0f;
+        }
+
+        if (auto bslsp = dynamic_cast<nifly::BSLightingShaderProperty*>(shader)) {
+            zBufferTest  = bslsp->shaderFlags1 & SLSF1::ZBufferTest;
+            zBufferWrite = bslsp->shaderFlags2 & SLSF2::ZBufferWrite;
+            // SLSF1_Decal = 0x04000000, SLSF1_Dynamic_Decal = 0x08000000.
+            // Bethesda marks decals (roads, blood splats, graffiti) with
+            // these flags. We use them to drive polygon offset so decals
+            // don't z-fight with the coincident base mesh.
+            isDecal = bslsp->shaderFlags1 & 0x0C000000;
+
+            auto bslspType = bslsp->GetShaderType();
+            if (bslspType == nifly::BSLSP_SKINTINT || bslspType == nifly::BSLSP_FACE) {
+                tintColor    = convertVector3(bslsp->skinTintColor);
+                hasTintColor = true;
+            }
+            else if (bslspType == nifly::BSLSP_HAIRTINT) {
+                tintColor    = convertVector3(bslsp->hairTintColor);
+                hasTintColor = true;
+            }
+
+            if (bslspType == nifly::BSLSP_MULTILAYERPARALLAX) {
+                innerScale      = convertVector2(bslsp->parallaxInnerLayerTextureScale);
+                innerThickness  = bslsp->parallaxInnerLayerThickness;
+                outerRefraction = bslsp->parallaxRefractionScale;
+                outerReflection = bslsp->parallaxEnvmapStrength;
+            }
+        }
+
+        if (auto effectShader = dynamic_cast<nifly::BSEffectShaderProperty*>(shader)) {
+            hasWeaponBlood = effectShader->shaderFlags2 & SLSF2::WeaponBlood;
+        }
+    }
+    else {
+        textures[BaseMap]   = textureManager->getWhiteTexture();
+        textures[NormalMap] = textureManager->getFlatNormalTexture();
+    }
+}
+
+void OpenGLShape::destroy()
+{
+    for (std::size_t i = 0; i < ATTRIB_COUNT; i++) {
+        if (vertexBuffers[i]) {
+            vertexBuffers[i]->destroy();
+            delete vertexBuffers[i];
+            vertexBuffers[i] = nullptr;
+        }
+    }
+
+    if (indexBuffer) {
+        indexBuffer->destroy();
+        delete indexBuffer;
+        indexBuffer = nullptr;
+    }
+
+    if (vertexArray) {
+        vertexArray->destroy();
+        vertexArray->deleteLater();
+    }
+}
+
+void OpenGLShape::setupShaders(QOpenGLShaderProgram* program)
+{
+    program->setUniformValue("BaseMap", BaseMap + 1);
+    program->setUniformValue("NormalMap", NormalMap + 1);
+    program->setUniformValue("GlowMap", GlowMap + 1);
+    program->setUniformValue("LightMask", LightMask + 1);
+    program->setUniformValue("hasGlowMap", hasGlowMap && textures[GlowMap] != nullptr);
+    program->setUniformValue("HeightMap", HeightMap + 1);
+    program->setUniformValue("hasHeightMap", textures[HeightMap] != nullptr);
+    program->setUniformValue("DetailMask", DetailMask + 1);
+    program->setUniformValue("hasDetailMask", textures[DetailMask] != nullptr);
+    program->setUniformValue("CubeMap", EnvironmentMap + 1);
+    program->setUniformValue("hasCubeMap", textures[EnvironmentMap] != nullptr);
+    program->setUniformValue("EnvironmentMap", EnvironmentMask + 1);
+    program->setUniformValue("hasEnvMask", textures[EnvironmentMask] != nullptr);
+    program->setUniformValue("TintMask", TintMask + 1);
+    program->setUniformValue("hasTintMask", textures[TintMask] != nullptr);
+    program->setUniformValue("InnerMap", InnerMap + 1);
+    program->setUniformValue("BacklightMap", BacklightMap + 1);
+    program->setUniformValue("SpecularMap", SpecularMap + 1);
+    program->setUniformValue("hasSpecularMap", textures[SpecularMap] != nullptr);
+
+    for (int i = 0; i < textures.size(); i++) {
+        if (textures[i]) {
+            textures[i]->bind(i + 1);
+        }
+    }
+
+    program->setUniformValue("ambientColor", QVector4D(0.2f, 0.2f, 0.2f, 1.0f));
+    program->setUniformValue("diffuseColor", QVector4D(1.0f, 1.0f, 1.0f, 1.0f));
+
+    program->setUniformValue("alpha", alpha);
+    program->setUniformValue("tintColor", tintColor);
+    program->setUniformValue("uvScale", uvScale);
+    program->setUniformValue("uvOffset", uvOffset);
+    program->setUniformValue("specColor", specColor);
+    program->setUniformValue("specStrength", specStrength);
+    program->setUniformValue("specGlossiness", specGlossiness);
+    program->setUniformValue("fresnelPower", fresnelPower);
+
+    program->setUniformValue("paletteScale", paletteScale);
+
+    program->setUniformValue("hasEmit", hasEmit);
+    program->setUniformValue("hasSoftlight", hasSoftlight);
+    program->setUniformValue("hasBacklight", hasBacklight);
+    program->setUniformValue("hasRimlight", hasRimlight);
+    program->setUniformValue("hasTintColor", hasTintColor);
+    program->setUniformValue("hasWeaponBlood", hasWeaponBlood);
+
+    program->setUniformValue("softlight", softlight);
+    program->setUniformValue("backlightPower", backlightPower);
+    program->setUniformValue("rimPower", rimPower);
+    program->setUniformValue("subsurfaceRolloff", subsurfaceRolloff);
+    program->setUniformValue("doubleSided", doubleSided);
+
+    program->setUniformValue("envReflection", envReflection);
+
+    if (shaderType == ShaderManager::SKMultilayer) {
+        program->setUniformValue("innerScale", innerScale);
+        program->setUniformValue("innerThickness", innerThickness);
+        program->setUniformValue("outerRefraction", outerRefraction);
+        program->setUniformValue("outerReflection", outerReflection);
+    }
+
+    auto f = QOpenGLVersionFunctionsFactory::get<QOpenGLFunctions_2_1>(
+        QOpenGLContext::currentContext());
+
+    for (std::size_t i = 0; i < ATTRIB_COUNT; i++) {
+        if (vertexBuffers[i]) {
+            f->glEnableVertexAttribArray(i);
+        }
+        else {
+            f->glDisableVertexAttribArray(i);
+        }
+    }
+
+    f->glDepthMask(zBufferWrite ? GL_TRUE : GL_FALSE);
+
+    if (zBufferTest) {
+        f->glEnable(GL_DEPTH_TEST);
+    }
+    else {
+        f->glDisable(GL_DEPTH_TEST);
+    }
+
+    // Polygon offset bias is set per-shape by the draw loop in
+    // NifWidget::paintGL — don't touch it here.
+
+    if (doubleSided) {
+        f->glDisable(GL_CULL_FACE);
+    }
+    else {
+        f->glEnable(GL_CULL_FACE);
+        f->glCullFace(GL_BACK);
+    }
+
+    if (alphaBlendEnable) {
+        f->glEnable(GL_BLEND);
+        f->glBlendFunc(srcBlendMode, dstBlendMode);
+    }
+    else {
+        f->glDisable(GL_BLEND);
+    }
+
+    if (alphaTestEnable) {
+        f->glEnable(GL_ALPHA_TEST);
+        f->glAlphaFunc(alphaTestMode, alphaThreshold);
+    }
+    else {
+        f->glDisable(GL_ALPHA_TEST);
+    }
+}
+
+QVector2D OpenGLShape::convertVector2(nifly::Vector2 vector)
+{
+    return {vector.u, vector.v};
+}
+
+QVector3D OpenGLShape::convertVector3(nifly::Vector3 vector)
+{
+    return {vector.x, vector.y, vector.z};
+}
+
+QColor OpenGLShape::convertColor(nifly::Color4 color)
+{
+    return QColor::fromRgbF(color.r, color.g, color.b, color.a);
+}
+
+QMatrix4x4 OpenGLShape::convertTransform(nifly::MatTransform transform)
+{
+    auto mat = transform.ToMatrix();
+    return QMatrix4x4{
+        mat[0], mat[1], mat[2],  mat[3],  mat[4],  mat[5],  mat[6],  mat[7],
+        mat[8], mat[9], mat[10], mat[11], mat[12], mat[13], mat[14], mat[15],
+    };
+}
diff --git a/libs/preview_nif/src/OpenGLShape.h b/libs/preview_nif/src/OpenGLShape.h
new file mode 100644
index 0000000..b53e96d
--- /dev/null
+++ b/libs/preview_nif/src/OpenGLShape.h
@@ -0,0 +1,105 @@
+#pragma once
+
+#include "ShaderManager.h"
+#include "TextureManager.h"
+
+#include <Geometry.hpp>
+#include <NifFile.hpp>
+
+#include <QOpenGLBuffer>
+#include <QOpenGLShaderProgram>
+#include <QOpenGLTexture>
+#include <QOpenGLVertexArrayObject>
+#include <QWidget>
+
+enum TextureSlot
+{
+    BaseMap = 0,
+    NormalMap = 1,
+    GlowMap = 2,
+    LightMask = 2,
+    HeightMap = 3,
+    DetailMask = 3,
+    EnvironmentMap = 4,
+    EnvironmentMask = 5,
+    TintMask = 6,
+    InnerMap = 6,
+    BacklightMap = 7,
+    SpecularMap = 7,
+};
+
+struct OpenGLShape
+{
+public:
+    OpenGLShape(
+        nifly::NifFile* nifFile,
+        nifly::NiShape* niShape,
+        TextureManager* textureManager);
+
+    void destroy();
+    void setupShaders(QOpenGLShaderProgram* program);
+
+    static QVector2D convertVector2(nifly::Vector2 vector);
+    static QVector3D convertVector3(nifly::Vector3 vector);
+    static QColor convertColor(nifly::Color4 color);
+    static QMatrix4x4 convertTransform(nifly::MatTransform transform);
+
+    ShaderManager::ShaderType shaderType = ShaderManager::SKDefault;
+
+    QOpenGLVertexArrayObject* vertexArray = nullptr;
+
+    QOpenGLBuffer* vertexBuffers[ATTRIB_COUNT] { nullptr };
+
+    QOpenGLBuffer* indexBuffer = nullptr;
+    GLsizei elements = 0;
+
+    std::array<QOpenGLTexture*, 13> textures { nullptr };
+
+    QMatrix4x4 modelMatrix;
+    QVector3D specColor{ 1.0f, 1.0f, 1.0f };
+    float specStrength = 1.0f ;
+    float specGlossiness = 1.0f;
+    float fresnelPower;
+
+    float paletteScale;
+
+    bool hasGlowMap = false;
+    QColor glowColor = QColorConstants::White;
+    float glowMult = 1.0f;
+
+    float alpha = 1.0f;
+    QVector3D tintColor{ 1.0f, 1.0f, 1.0f };
+
+    QVector2D uvScale{ 1.0f, 1.0f };
+    QVector2D uvOffset{ 0.0f, 0.0f };
+
+    bool hasEmit = false;
+    bool hasSoftlight = false;
+    bool hasBacklight = false;
+    bool hasRimlight = false;
+    bool hasTintColor = false;
+    bool hasWeaponBlood = false;
+
+    bool doubleSided = false;
+    float softlight = 0.3f;
+    float backlightPower = 0.0f;
+    float rimPower = 2.0f;
+    float subsurfaceRolloff;
+    float envReflection = 1.0f;
+
+    QVector2D innerScale;
+    float innerThickness;
+    float outerRefraction;
+    float outerReflection;
+
+    bool zBufferWrite = true;
+    bool zBufferTest = true;
+    bool isDecal = false;
+
+    bool alphaBlendEnable = false;
+    GLenum srcBlendMode = GL_ONE;
+    GLenum dstBlendMode = GL_ONE;
+    bool alphaTestEnable = false;
+    GLenum alphaTestMode = GL_GREATER;
+    float alphaThreshold = 0.0f;
+};
diff --git a/libs/preview_nif/src/PreviewNif.cpp b/libs/preview_nif/src/PreviewNif.cpp
new file mode 100644
index 0000000..8e7e03a
--- /dev/null
+++ b/libs/preview_nif/src/PreviewNif.cpp
@@ -0,0 +1,114 @@
+#include <NifFile.hpp>
+
+#include "PreviewNif.h"
+#include "NifExtensions.h"
+#include "NifWidget.h"
+
+#include <QGridLayout>
+#include <filesystem>
+#include <sstream>
+#include <string>
+
+bool PreviewNif::init(MOBase::IOrganizer* moInfo)
+{
+    m_MOInfo = moInfo;
+    return true;
+}
+
+QString PreviewNif::name() const
+{
+    return "Preview NIF";
+}
+
+QString PreviewNif::author() const
+{
+    return "Parapets";
+}
+
+QString PreviewNif::description() const
+{
+    return "Supports previewing NIF files";
+}
+
+MOBase::VersionInfo PreviewNif::version() const
+{
+    return MOBase::VersionInfo(0, 2, 0, 0, MOBase::VersionInfo::RELEASE_BETA);
+}
+
+QList<MOBase::PluginSetting> PreviewNif::settings() const
+{
+    return QList<MOBase::PluginSetting>();
+}
+
+bool PreviewNif::enabledByDefault() const
+{
+    return true;
+}
+
+std::set<QString> PreviewNif::supportedExtensions() const
+{
+    return { "bto", "btr", "nif" };
+}
+
+QWidget* PreviewNif::genFilePreview(const QString& fileName, const QSize&) const
+{
+    auto path    = std::filesystem::path(fileName.toStdString());
+    auto nifFile = std::make_shared<nifly::NifFile>(path);
+
+    if (!nifFile->IsValid()) {
+        qWarning(qUtf8Printable(tr("Failed to load file: %1").arg(fileName)));
+        return nullptr;
+    }
+
+    return makeWidget(nifFile);
+}
+
+QWidget* PreviewNif::genDataPreview(const QByteArray& fileData,
+                                    const QString& fileName, const QSize&) const
+{
+    std::string data(fileData.constData(), fileData.size());
+    std::istringstream stream(std::move(data), std::ios::binary);
+
+    auto nifFile = std::make_shared<nifly::NifFile>();
+    if (nifFile->Load(stream) != 0 || !nifFile->IsValid()) {
+        qWarning(qUtf8Printable(tr("Failed to load file: %1").arg(fileName)));
+        return nullptr;
+    }
+
+    return makeWidget(nifFile);
+}
+
+QWidget* PreviewNif::makeWidget(std::shared_ptr<nifly::NifFile> nifFile) const
+{
+    auto layout = new QGridLayout();
+    layout->setRowStretch(0, 1);
+    layout->setColumnStretch(0, 1);
+
+    layout->addWidget(makeLabel(nifFile.get()), 1, 0, 1, 1);
+
+    auto nifWidget = new NifWidget(nifFile, m_MOInfo);
+    layout->addWidget(nifWidget, 0, 0, 1, 1);
+
+    auto widget = new QWidget();
+    widget->setLayout(layout);
+    return widget;
+}
+
+QLabel* PreviewNif::makeLabel(nifly::NifFile* nifFile) const
+{
+    int shapes = 0;
+    int faces = 0;
+    int verts = 0;
+
+    for (auto& shape : nifFile->GetShapes()) {
+        shapes++;
+        faces += shape->GetNumTriangles();
+        verts += shape->GetNumVertices();
+    }
+
+    auto text = tr("Verts: %1 | Faces: %2 | Shapes: %3").arg(verts).arg(faces).arg(shapes);
+    auto label = new QLabel(text);
+    label->setWordWrap(true);
+    label->setTextInteractionFlags(Qt::TextSelectableByMouse);
+    return label;
+}
diff --git a/libs/preview_nif/src/PreviewNif.h b/libs/preview_nif/src/PreviewNif.h
new file mode 100644
index 0000000..cd5175d
--- /dev/null
+++ b/libs/preview_nif/src/PreviewNif.h
@@ -0,0 +1,39 @@
+#pragma once
+
+#include <ipluginpreview.h>
+#include <QLabel>
+#include <NifFile.hpp>
+
+class PreviewNif : public MOBase::IPluginPreview
+{
+    Q_OBJECT
+    Q_INTERFACES(MOBase::IPlugin MOBase::IPluginPreview)
+    Q_PLUGIN_METADATA(IID "org.tannin.PreviewNif" FILE "previewnif.json")
+
+public:
+    PreviewNif() = default;
+
+    // IPlugin Interface
+
+    bool init(MOBase::IOrganizer* moInfo) override;
+    QString name() const override;
+    QString author() const override;
+    QString description() const override;
+    MOBase::VersionInfo version() const override;
+    QList<MOBase::PluginSetting> settings() const override;
+    bool enabledByDefault() const override;
+
+    // IPluginPreview interface
+
+    std::set<QString> supportedExtensions() const override;
+    bool supportsArchives() const override { return true; }
+    QWidget* genFilePreview(const QString& fileName, const QSize& maxSize) const override;
+    QWidget* genDataPreview(const QByteArray& fileData, const QString& fileName,
+                            const QSize& maxSize) const override;
+
+private:
+    QWidget* makeWidget(std::shared_ptr<nifly::NifFile> nifFile) const;
+    QLabel* makeLabel(nifly::NifFile* nifFile) const;
+
+    MOBase::IOrganizer* m_MOInfo;
+};
diff --git a/libs/preview_nif/src/ShaderManager.cpp b/libs/preview_nif/src/ShaderManager.cpp
new file mode 100644
index 0000000..2109b44
--- /dev/null
+++ b/libs/preview_nif/src/ShaderManager.cpp
@@ -0,0 +1,74 @@
+#include "ShaderManager.h"
+
+#include <QOpenGLContext>
+
+ShaderManager::ShaderManager(MOBase::IOrganizer* moInfo) : m_MOInfo{ moInfo }
+{}
+
+QOpenGLShaderProgram* ShaderManager::getProgram(ShaderType type)
+{
+    if (type == None) {
+        return nullptr;
+    }
+
+    if (m_Programs[type] == nullptr) {
+        m_Programs[type] = loadProgram(type);
+    }
+
+    return m_Programs[type];
+}
+
+QOpenGLShaderProgram* ShaderManager::loadProgram(ShaderType type)
+{
+    QString vert;
+    QString frag;
+
+    switch (type) {
+    case SKDefault:
+        vert = "default.vert";
+        frag = "sk_default.frag";
+        break;
+    case SKMSN:
+        vert = "sk_msn.vert";
+        frag = "sk_msn.frag";
+        break;
+    case SKMultilayer:
+        vert = "default.vert";
+        frag = "sk_multilayer.frag";
+        break;
+    case SKEffectShader:
+        vert = "sk_effectshader.vert";
+        frag = "sk_effectshader.frag";
+        break;
+    case FO4Default:
+        vert = "default.vert";
+        frag = "fo4_default.frag";
+        break;
+    case FO4EffectShader:
+        vert = "default.vert";
+        frag = "fo4_effectshader.frag";
+        break;
+    default:
+        return nullptr;
+    }
+
+    auto game = m_MOInfo->managedGame();
+    auto dataPath = MOBase::IOrganizer::getPluginDataPath();
+    auto vertexShader = QString("%1/shaders/%2").arg(dataPath).arg(vert);
+    auto fragmentShader = QString("%1/shaders/%2").arg(dataPath).arg(frag);
+
+    auto program = new QOpenGLShaderProgram(QOpenGLContext::currentContext());
+    program->addShaderFromSourceFile(QOpenGLShader::Vertex, vertexShader);
+    program->addShaderFromSourceFile(QOpenGLShader::Fragment, fragmentShader);
+
+    program->bindAttributeLocation("position", AttribPosition);
+    program->bindAttributeLocation("normal", AttribNormal);
+    program->bindAttributeLocation("tangent", AttribTangent);
+    program->bindAttributeLocation("bitangent", AttribBitangent);
+    program->bindAttributeLocation("texCoord", AttribTexCoord);
+    program->bindAttributeLocation("color", AttribColor);
+
+    program->link();
+
+    return program;
+}
diff --git a/libs/preview_nif/src/ShaderManager.h b/libs/preview_nif/src/ShaderManager.h
new file mode 100644
index 0000000..3c38ba1
--- /dev/null
+++ b/libs/preview_nif/src/ShaderManager.h
@@ -0,0 +1,48 @@
+#pragma once
+
+#include <imoinfo.h>
+#include <QOpenGLShaderProgram>
+
+enum VertexAttrib
+{
+    AttribPosition = 0,
+    AttribNormal = 1,
+    AttribTangent = 2,
+    AttribBitangent = 3,
+    AttribTexCoord = 4,
+    AttribColor = 5,
+
+    ATTRIB_COUNT,
+};
+
+class ShaderManager
+{
+public:
+    enum ShaderType
+    {
+        None = -1,
+        SKDefault,
+        SKMSN,
+        SKMultilayer,
+        SKEffectShader,
+        FO4Default,
+        FO4EffectShader,
+
+        SHADER_COUNT,
+    };
+
+    ShaderManager(MOBase::IOrganizer* moInfo);
+    ~ShaderManager() = default;
+    ShaderManager(const ShaderManager&) = delete;
+    ShaderManager(ShaderManager&&) = delete;
+    ShaderManager& operator=(const ShaderManager&) = delete;
+    ShaderManager& operator=(ShaderManager&&) = delete;
+
+    QOpenGLShaderProgram* getProgram(ShaderType type);
+
+private:
+    QOpenGLShaderProgram* loadProgram(ShaderType type);
+
+    MOBase::IOrganizer* m_MOInfo;
+    QOpenGLShaderProgram* m_Programs[SHADER_COUNT] { nullptr };
+};
diff --git a/libs/preview_nif/src/TextureManager.cpp b/libs/preview_nif/src/TextureManager.cpp
new file mode 100644
index 0000000..2135ec6
--- /dev/null
+++ b/libs/preview_nif/src/TextureManager.cpp
@@ -0,0 +1,448 @@
+#include "TextureManager.h"
+#include "PreviewNif.h"
+
+#include <dataarchives.h>
+#include <igamefeatures.h>
+#include <imodinterface.h>
+#include <imodlist.h>
+#include <imoinfo.h>
+#include <ipluginlist.h>
+#include <iplugingame.h>
+
+#include <gli/gli.hpp>
+#include <libbsarch.h>
+
+#include <QDir>
+#include <QDirIterator>
+#include <QFileInfo>
+#include <QSet>
+
+#include <QOpenGLContext>
+#include <QOpenGLFunctions_2_1>
+#include <QOpenGLVersionFunctionsFactory>
+#include <QVector4D>
+
+#include <exception>
+#include <memory>
+
+TextureManager::TextureManager(MOBase::IOrganizer* moInfo) : m_MOInfo{moInfo} {}
+
+void TextureManager::cleanup()
+{
+    for (auto it = m_Textures.cbegin(); it != m_Textures.cend();) {
+        auto texture = it->second;
+        m_Textures.erase(it++);
+        delete texture;
+    }
+
+    if (m_ErrorTexture) {
+        delete m_ErrorTexture;
+        m_ErrorTexture = nullptr;
+    }
+
+    if (m_BlackTexture) {
+        delete m_BlackTexture;
+        m_BlackTexture = nullptr;
+    }
+
+    if (m_WhiteTexture) {
+        delete m_WhiteTexture;
+        m_WhiteTexture = nullptr;
+    }
+
+    if (m_FlatNormalTexture) {
+        delete m_FlatNormalTexture;
+        m_FlatNormalTexture = nullptr;
+    }
+}
+
+QOpenGLTexture* TextureManager::getTexture(const std::string& texturePath)
+{
+    return getTexture(QString::fromStdString(texturePath));
+}
+
+QOpenGLTexture* TextureManager::getTexture(QString texturePath)
+{
+    if (texturePath.isEmpty()) {
+        return nullptr;
+    }
+
+    auto key = texturePath.toLower().toStdWString();
+
+    auto cached = m_Textures.find(key);
+    if (cached != m_Textures.end()) {
+        return cached->second;
+    }
+
+    auto texture = loadTexture(texturePath);
+
+    m_Textures[key] = texture;
+    return texture;
+}
+
+QOpenGLTexture* TextureManager::getErrorTexture()
+{
+    if (!m_ErrorTexture) {
+        m_ErrorTexture = makeSolidColor({1.0f, 0.0f, 1.0f, 1.0f});
+    }
+
+    return m_ErrorTexture;
+}
+
+QOpenGLTexture* TextureManager::getBlackTexture()
+{
+    if (!m_BlackTexture) {
+        m_BlackTexture = makeSolidColor({0.0f, 0.0f, 0.0f, 1.0f});
+    }
+
+    return m_BlackTexture;
+}
+
+QOpenGLTexture* TextureManager::getWhiteTexture()
+{
+    if (!m_WhiteTexture) {
+        m_WhiteTexture = makeSolidColor({1.0f, 1.0f, 1.0f, 1.0f});
+    }
+
+    return m_WhiteTexture;
+}
+
+QOpenGLTexture* TextureManager::getFlatNormalTexture()
+{
+    if (!m_FlatNormalTexture) {
+        m_FlatNormalTexture = makeSolidColor({0.5f, 0.5f, 1.0f, 1.0f});
+    }
+
+    return m_FlatNormalTexture;
+}
+
+QOpenGLTexture* TextureManager::loadTexture(QString texturePath)
+{
+    if (texturePath.isEmpty()) {
+        return nullptr;
+    }
+
+    auto game = m_MOInfo->managedGame();
+
+    if (!game) {
+        return nullptr;
+    }
+
+    // 1) Loose file via MO2's virtual tree (honors mod priority + Overwrite).
+    auto realPath = resolvePath(game, texturePath);
+    if (!realPath.isEmpty()) {
+        return makeTexture(gli::load(realPath.toStdString()));
+    }
+
+    // 2) BSA fallback. Walk cached priority-sorted candidate list.
+    auto tryExtract = [&](const QString& bsaPath) -> QOpenGLTexture* {
+        using bsa_ptr = std::unique_ptr<void, decltype(&bsa_free)>;
+        auto bsa      = bsa_ptr(bsa_create(), bsa_free);
+
+        const std::wstring bsaPathW     = bsaPath.toStdWString();
+        const std::wstring texturePathW = texturePath.toStdWString();
+
+        bsa_result_message_t result =
+            bsa_load_from_file(bsa.get(), bsaPathW.c_str());
+        if (result.code == BSA_RESULT_EXCEPTION) {
+            return nullptr;
+        }
+
+        auto result_buffer =
+            bsa_extract_file_data_by_filename(bsa.get(), texturePathW.c_str());
+        if (result_buffer.message.code == BSA_RESULT_EXCEPTION ||
+            !result_buffer.buffer.data) {
+            return nullptr;
+        }
+
+        auto buffer_free = [&bsa](bsa_result_buffer_t* buffer) {
+            bsa_file_data_free(bsa.get(), *buffer);
+        };
+        using buffer_ptr =
+            std::unique_ptr<bsa_result_buffer_t, decltype(buffer_free)>;
+        auto buffer = buffer_ptr(&result_buffer.buffer, buffer_free);
+
+        return makeTexture(
+            gli::load(static_cast<char*>(buffer->data), buffer->size));
+    };
+
+    for (const QString& bsaPath : bsaCandidates()) {
+        if (auto* tex = tryExtract(bsaPath)) {
+            return tex;
+        }
+    }
+
+    return nullptr;
+}
+
+// Process-wide BSA candidate cache. Keyed by profile directory path so
+// switching instances invalidates automatically. Built once, reused across
+// every NIF preview until the profile changes.
+namespace {
+    QString g_cachedProfileKey;
+    QStringList g_cachedBsaCandidates;
+}
+
+const QStringList& TextureManager::bsaCandidates()
+{
+    QString profileKey;
+    if (auto profile = m_MOInfo->profile()) {
+        profileKey = profile->absolutePath();
+    }
+
+    if (profileKey == g_cachedProfileKey && !g_cachedBsaCandidates.isEmpty()) {
+        return g_cachedBsaCandidates;
+    }
+
+    g_cachedBsaCandidates.clear();
+    rebuildBsaCandidates();
+    g_cachedProfileKey = profileKey;
+    return g_cachedBsaCandidates;
+}
+
+void TextureManager::rebuildBsaCandidates()
+{
+    QSet<QString> seen;
+
+    auto addCandidate = [&](const QString& p) {
+        QString norm = QDir::cleanPath(p);
+        if (!norm.isEmpty() && !seen.contains(norm)) {
+            seen.insert(norm);
+            g_cachedBsaCandidates.append(norm);
+        }
+    };
+
+    try {
+        auto game = m_MOInfo->managedGame();
+
+        if (auto* modList = m_MOInfo->modList()) {
+            auto profile = m_MOInfo->profile();
+            QStringList modNames =
+                modList->allModsByProfilePriority(profile.get());
+
+            for (auto it = modNames.rbegin(); it != modNames.rend(); ++it) {
+                if (!(modList->state(*it) & MOBase::IModList::STATE_ACTIVE))
+                    continue;
+
+                MOBase::IModInterface* mod = modList->getMod(*it);
+                if (!mod) continue;
+
+                QDir modDir(mod->absolutePath());
+                if (!modDir.exists()) continue;
+
+                const QStringList bsas =
+                    modDir.entryList(QStringList{"*.bsa", "*.ba2"},
+                                     QDir::Files | QDir::NoDotAndDotDot);
+                for (const QString& name : bsas) {
+                    addCandidate(modDir.absoluteFilePath(name));
+                }
+            }
+        }
+
+        // Vanilla/game archives from DataArchives ini list.
+        if (auto* features = m_MOInfo->gameFeatures()) {
+            if (auto gameArchives =
+                    features->gameFeature<MOBase::DataArchives>()) {
+                auto profile  = m_MOInfo->profile();
+                auto archives = gameArchives->archives(profile.get());
+                for (auto it = archives.rbegin(); it != archives.rend(); ++it) {
+                    QString resolved = resolvePath(game, *it);
+                    if (!resolved.isEmpty()) addCandidate(resolved);
+                }
+            }
+        }
+    } catch (...) {
+    }
+}
+
+
+QOpenGLTexture* TextureManager::makeTexture(const gli::texture& texture)
+{
+    if (texture.empty()) {
+        return nullptr;
+    }
+
+    gli::gl GL(gli::gl::PROFILE_GL32);
+    const gli::gl::format format = GL.translate(texture.format(), texture.swizzles());
+    GLenum target                = GL.translate(texture.target());
+
+    auto f = QOpenGLVersionFunctionsFactory::get<QOpenGLFunctions_2_1>(
+        QOpenGLContext::currentContext());
+    QOpenGLTexture* glTexture =
+        new QOpenGLTexture(static_cast<QOpenGLTexture::Target>(target));
+
+    glTexture->create();
+    glTexture->bind();
+    glTexture->setMipLevels(texture.levels());
+    glTexture->setMipBaseLevel(0);
+    glTexture->setMipMaxLevel(texture.levels() - 1);
+    glTexture->setMinMagFilters(QOpenGLTexture::LinearMipMapLinear,
+                                QOpenGLTexture::Linear);
+    glTexture->setSwizzleMask(
+        static_cast<QOpenGLTexture::SwizzleValue>(format.Swizzles[0]),
+        static_cast<QOpenGLTexture::SwizzleValue>(format.Swizzles[1]),
+        static_cast<QOpenGLTexture::SwizzleValue>(format.Swizzles[2]),
+        static_cast<QOpenGLTexture::SwizzleValue>(format.Swizzles[3]));
+
+    glTexture->setWrapMode(QOpenGLTexture::Repeat);
+
+    auto extent             = texture.extent();
+    const GLsizei faceTotal = texture.layers() * texture.faces();
+
+    glTexture->setSize(extent.x, extent.y, extent.z);
+    glTexture->setFormat(static_cast<QOpenGLTexture::TextureFormat>(format.Internal));
+    glTexture->allocateStorage(
+        static_cast<QOpenGLTexture::PixelFormat>(format.External),
+        static_cast<QOpenGLTexture::PixelType>(format.Type));
+
+    for (std::size_t layer = 0; layer < texture.layers(); layer++)
+        for (std::size_t face = 0; face < texture.faces(); face++)
+            for (std::size_t level = 0; level < texture.levels(); level++) {
+                auto extent = texture.extent(level);
+
+                target =
+                    gli::is_target_cube(texture.target())
+                        ? static_cast<GLenum>(GL_TEXTURE_CUBE_MAP_POSITIVE_X + face)
+                        : target;
+
+                // Qt's upload functions lag badly so we just use the GL API
+                switch (texture.target()) {
+                case gli::TARGET_1D:
+                    if (gli::is_compressed(texture.format())) {
+                        f->glCompressedTexSubImage1D(
+                            target, level, 0, extent.x, format.Internal,
+                            texture.size(level), texture.data(layer, face, level));
+                    }
+                    else {
+                        f->glTexSubImage1D(target, level, 0, extent.x, format.External,
+                                           format.Type,
+                                           texture.data(layer, face, level));
+                    }
+                    break;
+                case gli::TARGET_1D_ARRAY:
+                case gli::TARGET_2D:
+                case gli::TARGET_CUBE:
+                    if (gli::is_compressed(texture.format())) {
+                        f->glCompressedTexSubImage2D(
+                            target, level, 0, 0, extent.x,
+                            texture.target() == gli::TARGET_1D_ARRAY ? layer : extent.y,
+                            format.Internal, texture.size(level),
+                            texture.data(layer, face, level));
+                    }
+                    else {
+                        f->glTexSubImage2D(
+                            target, level, 0, 0, extent.x,
+                            texture.target() == gli::TARGET_1D_ARRAY ? layer : extent.y,
+                            format.External, format.Type,
+                            texture.data(layer, face, level));
+                    }
+                    break;
+                case gli::TARGET_2D_ARRAY:
+                case gli::TARGET_3D:
+                case gli::TARGET_CUBE_ARRAY:
+                    if (gli::is_compressed(texture.format())) {
+                        f->glCompressedTexSubImage3D(
+                            target, level, 0, 0, 0, extent.x, extent.y,
+                            texture.target() == gli::TARGET_3D ? extent.z : layer,
+                            format.Internal, texture.size(level),
+                            texture.data(layer, face, level));
+                    }
+                    else {
+                        f->glTexSubImage3D(target, level, 0, 0, 0, extent.x, extent.y,
+                                           texture.target() == gli::TARGET_3D ? extent.z
+                                                                              : layer,
+                                           format.External, format.Type,
+                                           texture.data(layer, face, level));
+                    }
+                    break;
+                }
+            }
+
+    glTexture->release();
+
+    return glTexture;
+}
+
+QOpenGLTexture* TextureManager::makeSolidColor(QVector4D color)
+{
+    QOpenGLTexture* glTexture = new QOpenGLTexture(QOpenGLTexture::Target2D);
+    glTexture->create();
+    glTexture->bind();
+
+    glTexture->setSize(1, 1);
+    glTexture->setFormat(QOpenGLTexture::RGBA32F);
+    glTexture->allocateStorage(QOpenGLTexture::RGBA, QOpenGLTexture::Float32);
+
+    glTexture->setData(QOpenGLTexture::RGBA, QOpenGLTexture::Float32, &color);
+
+    glTexture->release();
+
+    return glTexture;
+}
+
+// Case-insensitive walk of a path relative to a root dir. Used because the
+// Linux FS is case-sensitive but Bethesda NIFs reference textures with
+// arbitrary case. We fix the case component-by-component against the real
+// on-disk filenames.
+static QString resolveCaseInsensitive(const QString& rootAbs, const QString& relPath)
+{
+    QStringList parts = QDir::cleanPath(relPath).split('/', Qt::SkipEmptyParts);
+    QString cursor    = rootAbs;
+    for (const QString& part : parts) {
+        QDir cur(cursor);
+        if (!cur.exists()) return "";
+        const QStringList entries =
+            cur.entryList(QDir::Files | QDir::Dirs | QDir::NoDotAndDotDot);
+        QString match;
+        for (const QString& entry : entries) {
+            if (entry.compare(part, Qt::CaseInsensitive) == 0) {
+                match = entry;
+                break;
+            }
+        }
+        if (match.isEmpty()) return "";
+        cursor = cur.absoluteFilePath(match);
+    }
+    return QFileInfo::exists(cursor) ? cursor : QString();
+}
+
+QString TextureManager::resolvePath(const MOBase::IPluginGame* game, QString path)
+{
+    // NIF texture paths use Windows backslashes. On Linux, IOrganizer's
+    // virtual tree keys on forward-slash paths, so normalize here before
+    // lookup. BSA lookups keep the raw backslash form separately.
+    QString normalized = path;
+    normalized.replace('\\', '/');
+
+    // MO2's virtual tree may return a path that matches case-insensitively
+    // against its internal index but doesn't match the real on-disk case.
+    // Verify existence — if the returned path doesn't actually exist, do a
+    // case-insensitive walk against the containing mod directory to recover
+    // the correct case.
+    auto virtPath = m_MOInfo->resolvePath(normalized);
+    if (!virtPath.isEmpty()) {
+        if (QFileInfo::exists(virtPath)) {
+            return virtPath;
+        }
+        // Path wasn't valid — walk up to find the mod root, then re-resolve
+        // case-insensitively under it. We detect the mod root by looking for
+        // the "textures/" segment (NIF texture paths are always rooted at
+        // textures/).
+        const int texIdx = virtPath.indexOf("/textures/", 0, Qt::CaseInsensitive);
+        if (texIdx > 0) {
+            const QString modRoot = virtPath.left(texIdx);
+            const QString rel     = virtPath.mid(texIdx + 1);
+            const QString fixed   = resolveCaseInsensitive(modRoot, rel);
+            if (!fixed.isEmpty()) return fixed;
+        }
+    }
+
+    auto dataDir  = game->dataDirectory();
+    auto dataPath = dataDir.absoluteFilePath(QDir::cleanPath(normalized));
+    if (QFileInfo::exists(dataPath)) {
+        return dataPath;
+    }
+
+    // Final fallback: case-insensitive walk under the game data directory.
+    return resolveCaseInsensitive(dataDir.absolutePath(), normalized);
+}
diff --git a/libs/preview_nif/src/TextureManager.h b/libs/preview_nif/src/TextureManager.h
new file mode 100644
index 0000000..7ba1c9a
--- /dev/null
+++ b/libs/preview_nif/src/TextureManager.h
@@ -0,0 +1,53 @@
+#pragma once
+
+#include <imoinfo.h>
+#include <gli/gli.hpp>
+#include <QOpenGLTexture>
+#include <QSet>
+#include <QStringList>
+#include <map>
+
+class TextureManager
+{
+public:
+    TextureManager(MOBase::IOrganizer* organizer);
+    ~TextureManager() = default;
+    TextureManager(const TextureManager&) = delete;
+    TextureManager(TextureManager&&) = delete;
+    TextureManager& operator=(const TextureManager&) = delete;
+    TextureManager& operator=(TextureManager&&) = delete;
+
+    void cleanup();
+
+    QOpenGLTexture* getTexture(const std::string& texturePath);
+    QOpenGLTexture* getTexture(QString texturePath);
+
+    QOpenGLTexture* getErrorTexture();
+    QOpenGLTexture* getBlackTexture();
+    QOpenGLTexture* getWhiteTexture();
+    QOpenGLTexture* getFlatNormalTexture();
+
+private:
+    QOpenGLTexture* loadTexture(QString texturePath);
+    QOpenGLTexture* makeTexture(const gli::texture& texture);
+    QOpenGLTexture* makeSolidColor(QVector4D color);
+
+    QString resolvePath(const MOBase::IPluginGame* game, QString path);
+
+    // Build priority-sorted BSA candidate list. Shared process-wide, keyed by
+    // the current instance's profile path so switching instances rebuilds.
+    // Conflict semantics: only active mods contribute, highest profile
+    // priority first, then vanilla archives. No plugin-attachment filter —
+    // matches BodySlide's "load all BSAs" approach which is what MO2's
+    // virtual data tree effectively does.
+    const QStringList& bsaCandidates();
+    void rebuildBsaCandidates();
+
+    MOBase::IOrganizer* m_MOInfo;
+    QOpenGLTexture* m_ErrorTexture = nullptr;
+    QOpenGLTexture* m_BlackTexture = nullptr;
+    QOpenGLTexture* m_WhiteTexture = nullptr;
+    QOpenGLTexture* m_FlatNormalTexture = nullptr;
+
+    std::map<std::wstring, QOpenGLTexture*> m_Textures;
+};
diff --git a/libs/preview_nif/src/preview_nif_en.ts b/libs/preview_nif/src/preview_nif_en.ts
new file mode 100644
index 0000000..10b8b07
--- /dev/null
+++ b/libs/preview_nif/src/preview_nif_en.ts
@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE TS>
+<TS version="2.1" language="en_US">
+<context>
+    <name>NifWidget</name>
+    <message>
+        <location filename="NifWidget.cpp" line="92"/>
+        <source>OpenGL debug message: %1</source>
+        <translation type="unfinished"></translation>
+    </message>
+</context>
+<context>
+    <name>PreviewNif</name>
+    <message>
+        <location filename="PreviewNif.cpp" line="57"/>
+        <source>Failed to load file: %1</source>
+        <translation type="unfinished"></translation>
+    </message>
+    <message>
+        <location filename="PreviewNif.cpp" line="87"/>
+        <source>Verts: %1 | Faces: %2 | Shapes: %3</source>
+        <translation type="unfinished"></translation>
+    </message>
+</context>
+<context>
+    <name>QObject</name>
+    <message>
+        <location filename="TextureManager.cpp" line="118"/>
+        <source>Failed to interface with managed game plugin</source>
+        <translation type="unfinished"></translation>
+    </message>
+</context>
+</TS>
diff --git a/libs/preview_nif/src/previewnif.json b/libs/preview_nif/src/previewnif.json
new file mode 100644
index 0000000..0967ef4
--- /dev/null
+++ b/libs/preview_nif/src/previewnif.json
@@ -0,0 +1 @@
+{}