-" myhalf4 bouncegrid_coeff1 = myhalf4(dp_texture3D(Texture_BounceGrid, BounceGridTexCoord )) * 2.0 + myhalf4(-1.0, -1.0, -1.0, -1.0);\n"
-" myhalf4 bouncegrid_coeff2 = myhalf4(dp_texture3D(Texture_BounceGrid, BounceGridTexCoord + vec3(0.0, 0.0, 0.25))) * 2.0 + myhalf4(-1.0, -1.0, -1.0, -1.0);\n"
-" myhalf4 bouncegrid_coeff3 = myhalf4(dp_texture3D(Texture_BounceGrid, BounceGridTexCoord + vec3(0.0, 0.0, 0.50))) * 2.0 + myhalf4(-1.0, -1.0, -1.0, -1.0);\n"
-" // bouncegrid_coeff4 is the bentnormal (average light direction), if that is useful for anything (can be used for specular)\n"
-"// myhalf4 bouncegrid_coeff4 = myhalf4(dp_texture3D(Texture_BounceGrid, BounceGridTexCoord + vec3(0.0, 0.0, 0.75))) * 2.0 + myhalf4(-1.0, -1.0, -1.0, -1.0);\n"
-" myhalf4 bouncegrid_dir = myhalf4((surfacenormal.x * VectorS.xyz + surfacenormal.y * VectorT.xyz + surfacenormal.z * VectorR.xyz), 1.0);\n"
-" myhalf3 bouncegrid_light = myhalf3(dot(bouncegrid_coeff1, bouncegrid_dir), dot(bouncegrid_coeff2, bouncegrid_dir), dot(bouncegrid_coeff3, bouncegrid_dir));\n"
+"// myhalf4 bouncegrid_coeff1 = cast_myhalf4(dp_texture3D(Texture_BounceGrid, BounceGridTexCoord ));\n"
+"// myhalf4 bouncegrid_coeff2 = cast_myhalf4(dp_texture3D(Texture_BounceGrid, BounceGridTexCoord + vec3(0.0, 0.0, 0.125))) * 2.0 + cast_myhalf4(-1.0, -1.0, -1.0, -1.0);\n"
+" myhalf4 bouncegrid_coeff3 = cast_myhalf4(dp_texture3D(Texture_BounceGrid, BounceGridTexCoord + vec3(0.0, 0.0, 0.250)));\n"
+" myhalf4 bouncegrid_coeff4 = cast_myhalf4(dp_texture3D(Texture_BounceGrid, BounceGridTexCoord + vec3(0.0, 0.0, 0.375)));\n"
+" myhalf4 bouncegrid_coeff5 = cast_myhalf4(dp_texture3D(Texture_BounceGrid, BounceGridTexCoord + vec3(0.0, 0.0, 0.500)));\n"
+" myhalf4 bouncegrid_coeff6 = cast_myhalf4(dp_texture3D(Texture_BounceGrid, BounceGridTexCoord + vec3(0.0, 0.0, 0.625)));\n"
+" myhalf4 bouncegrid_coeff7 = cast_myhalf4(dp_texture3D(Texture_BounceGrid, BounceGridTexCoord + vec3(0.0, 0.0, 0.750)));\n"
+" myhalf4 bouncegrid_coeff8 = cast_myhalf4(dp_texture3D(Texture_BounceGrid, BounceGridTexCoord + vec3(0.0, 0.0, 0.875)));\n"
+" myhalf3 bouncegrid_dir = normalize(mat3(BounceGridMatrix) * (surfacenormal.x * VectorS.xyz + surfacenormal.y * VectorT.xyz + surfacenormal.z * VectorR.xyz));\n"
+" myhalf3 bouncegrid_dirp = max(cast_myhalf3(0.0, 0.0, 0.0), bouncegrid_dir);\n"
+" myhalf3 bouncegrid_dirn = max(cast_myhalf3(0.0, 0.0, 0.0), -bouncegrid_dir);\n"
+"// bouncegrid_dirp = bouncegrid_dirn = cast_myhalf3(1.0,1.0,1.0);\n"
+" myhalf3 bouncegrid_light = cast_myhalf3(\n"
+" dot(bouncegrid_coeff3.xyz, bouncegrid_dirp) + dot(bouncegrid_coeff6.xyz, bouncegrid_dirn),\n"
+" dot(bouncegrid_coeff4.xyz, bouncegrid_dirp) + dot(bouncegrid_coeff7.xyz, bouncegrid_dirn),\n"
+" dot(bouncegrid_coeff5.xyz, bouncegrid_dirp) + dot(bouncegrid_coeff8.xyz, bouncegrid_dirn));\n"