Irrlicht Engine

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 //  - F O G -
 // Fragment Snippet for inspiration..
 
 varying vec2 UVCoordsXY;              // Vanilla..
 varying vec2 UVCoordsXYLIGHTMAP;      // Possible with "*.irrmesh" from Blender with Tubras's IRRB..
                                       // I ignored the scene and just loaded the "*.irrmesh" and gav it this material ID..
 varying vec3 VNormal;                 
 
 varying vec3 VertexGLPosition;
 varying vec3 VertexGLColour;          // Could be used as another method of Image Mixing i.e. Splatting..
                                       // But then your 3D format must support Vertex Colours like "*.stl" (Stanford Polys)
 
 // -------- ---- -- -  other code  
 
 uniform vec3 CameraPos;               // The Position of the camera i.e. the EYE..
                                       
 // *** F O G ***
 float FragCamDist;
 float DBFogFact;     // The key..
 vec3  FragCamDeltas; // Used in Camera to Vertex Distance which matters in Fog..
 
 // =  M A I N  = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = 
 void main()
  {float FOG_MAX_DIST = 150.0;
   vec3 FOG_COLOUR = vec3(0.529, 0.627, 0.608);
   FragCamDeltas = VertexGLPosition - CameraPos;
   // *** other code  *** 
   // Must do a GPU bitshift!!??
   FragCamDist = sqrt ((FragCamDeltas.x * FragCamDeltas.x) + (FragCamDeltas.y * FragCamDeltas.y) + (FragCamDeltas.z * FragCamDeltas.z));
   if (FragCamDist <= FOG_MAX_DIST)
    {DBFogFact =   (1.0 / FOG_MAX_DIST ) *  FragCamDist;
    }
  // It's either Linear Fog with a Further Distance or Squared Fog with a closer distance..
  // DBFogFact *= DBFogFact;       // Bring about a Squared Curve or keep it linear..
 
   if (FragCamDist >= FOG_MAX_DIST) {DBFogFact = 1.0;} // Otherwise fragments sudenly appear beyond the Fog Radius..
   // *** other code  *** 
   // Where MappedMixImageOnLightmapUV.x and y is Mixing Determinant, best painted on vertii and baked on Bitmap Image..
   vec3 PreFogOutput = ((MappedMixImageOnLightmapUV.x * MappedDiffuseOnDiffuseUV.xyz)
                        + (MappedMixImageOnLightmapUV.y * MappedSpecular.xyz))
                        * MappedLightMap.xyz;
                        
   PreFogOutput *= 1.25; // Just an Amp..
   gl_FragColor.xyz = lerp(PreFogOutput  , FOG_COLOUR, DBFogFact); 
 
   gl_FragColor.w = MappedDiffuse.w; // Our "Clip" mapping (not transparency) 
   // "The_Glitch".. This is GLSL but maybe you can convert to HLSL!
  }// -- END -- 
 
 
 
 
 
 
 

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   <buffer>
      <material bmat="001_WORLD:001_D_WORLD_GRASS_A.tga:Untitled.001">
         <enum name="Type" value="lightmap"/>
         <color name="Ambient" value="ffffffff"/>
         <color name="Diffuse" value="ffcccccc"/>
         <color name="Emissive" value="ff000000"/>
         <color name="Specular" value="ffffffff"/>
         <float name="Shininess" value="0"/>
         <float name="Param1" value="0"/>
         <float name="Param2" value="0"/>
         <bool name="Wireframe" value="false"/>
         <bool name="GouraudShading" value="true"/>
         <bool name="Lighting" value="true"/>
         <bool name="ZWriteEnable" value="true"/>
         <int name="ZBuffer" value="1"/>
         <bool name="BackfaceCulling" value="true"/>
         <bool name="FrontfaceCulling" value="false"/>
         <bool name="FogEnable" value="false"/>
         <bool name="NormalizeNormals" value="false"/>
         <bool name="UseMipMaps" value="true"/>
         <int name="AntiAliasing" value="1"/>
         <int name="ColorMask" value="15"/>
         <int name="PolygonOffsetFactor" value="0"/>
         <enum name="PolygonOffsetDirection" value="Front"/>
         <texture name="Texture1" value="DATA/0158_OAK_FOREST/001_D_WORLD_GRASS_A.tga"/>
         <enum name="TextureWrapU1" value="texture_clamp_repeat"/>
         <enum name="TextureWrapV1" value="texture_clamp_repeat"/>
         <bool name="BilinearFilter1" value="true"/>
         <bool name="TrilinearFilter1" value="false"/>
         <int name="AnisotropicFilter1" value="0"/>
         <int name="LODBias1" value="0"/>
         <texture name="Texture2" value="DATA/0158_OAK_FOREST/001_A_WORLD_A.tga"/>
         <enum name="TextureWrapU2" value="texture_clamp_repeat"/>
         <enum name="TextureWrapV2" value="texture_clamp_repeat"/>
         <bool name="BilinearFilter2" value="true"/>
         <bool name="TrilinearFilter2" value="false"/>
         <int name="AnisotropicFilter2" value="0"/>
         <int name="LODBias2" value="0"/>
         <texture name="Texture3" value="DATA/0158_OAK_FOREST/001_D_WORLD_ROCKS_A.tga"/>
         <enum name="TextureWrapU3" value="texture_clamp_repeat"/>
         <enum name="TextureWrapV3" value="texture_clamp_repeat"/>
         <bool name="BilinearFilter3" value="true"/>
         <bool name="TrilinearFilter3" value="false"/>
         <int name="AnisotropicFilter3" value="0"/>
         <int name="LODBias3" value="0"/>
         <texture name="Texture4" value="DATA/0158_OAK_FOREST/001_M_WORLD_A.tga"/>
         <enum name="TextureWrapU4" value="texture_clamp_repeat"/>
         <enum name="TextureWrapV4" value="texture_clamp_repeat"/>
         <bool name="BilinearFilter4" value="true"/>
         <bool name="TrilinearFilter4" value="false"/>
         <int name="AnisotropicFilter4" value="0"/>
         <int name="LODBias4" value="0"/>
      </material>
      <vertices type="2tcoords" vertexCount="387">
         16.314362 7.8625 -2.083676 0.110965 0.993103 etc etc etc ......