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0031135: Visualization, TKOpenGl - texture sRGB -> linear conversion is applied twice by Path Tracer

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Removed from PathtraceBase.fs redundant gamma correction applied to texture.
This commit is contained in:
kgv 2019-11-06 16:59:27 +03:00 committed by bugmaster
parent f979709590
commit a1a9b24952
3 changed files with 21 additions and 22 deletions
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15
src/Shaders/PathtraceBase.fs
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@ -831,20 +831,13 @@ vec4 PathTrace (in SRay theRay, in vec3 theInverse, in int theNbSamples)
if (aBSDF.Kd.w >= 0.f)
{
vec4 aTexCoord = vec4 (SmoothUV (aHit.UV, aTriIndex), 0.f, 1.f);
vec4 aTrsfRow1 = texelFetch (
uRaytraceMaterialTexture, MATERIAL_TRS1 (aTriIndex.w));
vec4 aTrsfRow2 = texelFetch (
uRaytraceMaterialTexture, MATERIAL_TRS2 (aTriIndex.w));
vec4 aTrsfRow1 = texelFetch (uRaytraceMaterialTexture, MATERIAL_TRS1 (aTriIndex.w));
vec4 aTrsfRow2 = texelFetch (uRaytraceMaterialTexture, MATERIAL_TRS2 (aTriIndex.w));
aTexCoord.st = vec2 (dot (aTrsfRow1, aTexCoord),
dot (aTrsfRow2, aTexCoord));
vec4 aTexColor = textureLod (
sampler2D (uTextureSamplers[int (aBSDF.Kd.w)]), aTexCoord.st, 0.f);
aBSDF.Kd.rgb *= (aTexColor.rgb * aTexColor.rgb) * aTexColor.w; // de-gamma correction (for gamma = 2)
vec4 aTexColor = textureLod (sampler2D (uTextureSamplers[int (aBSDF.Kd.w)]), aTexCoord.st, 0.f);
aBSDF.Kd.rgb *= aTexColor.rgb * aTexColor.w;
if (aTexColor.w != 1.0f)
{
// mix transparency BTDF with texture alpha-channel

15
src/Shaders/Shaders_PathtraceBase_fs.pxx
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@ -834,20 +834,13 @@ static const char Shaders_PathtraceBase_fs[] =
" if (aBSDF.Kd.w >= 0.f)\n"
" {\n"
" vec4 aTexCoord = vec4 (SmoothUV (aHit.UV, aTriIndex), 0.f, 1.f);\n"
"\n"
" vec4 aTrsfRow1 = texelFetch (\n"
" uRaytraceMaterialTexture, MATERIAL_TRS1 (aTriIndex.w));\n"
" vec4 aTrsfRow2 = texelFetch (\n"
" uRaytraceMaterialTexture, MATERIAL_TRS2 (aTriIndex.w));\n"
"\n"
" vec4 aTrsfRow1 = texelFetch (uRaytraceMaterialTexture, MATERIAL_TRS1 (aTriIndex.w));\n"
" vec4 aTrsfRow2 = texelFetch (uRaytraceMaterialTexture, MATERIAL_TRS2 (aTriIndex.w));\n"
" aTexCoord.st = vec2 (dot (aTrsfRow1, aTexCoord),\n"
" dot (aTrsfRow2, aTexCoord));\n"
"\n"
" vec4 aTexColor = textureLod (\n"
" sampler2D (uTextureSamplers[int (aBSDF.Kd.w)]), aTexCoord.st, 0.f);\n"
"\n"
" aBSDF.Kd.rgb *= (aTexColor.rgb * aTexColor.rgb) * aTexColor.w; // de-gamma correction (for gamma = 2)\n"
"\n"
" vec4 aTexColor = textureLod (sampler2D (uTextureSamplers[int (aBSDF.Kd.w)]), aTexCoord.st, 0.f);\n"
" aBSDF.Kd.rgb *= aTexColor.rgb * aTexColor.w;\n"
" if (aTexColor.w != 1.0f)\n"
" {\n"
" // mix transparency BTDF with texture alpha-channel\n"

13
tests/v3d/raytrace/sample_ball_wood Normal file
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@ -0,0 +1,13 @@
puts "============"
puts "0031135: Visualization, TKOpenGl - texture sRGB -> linear conversion is applied twice by Path Tracer"
puts "============"
puts ""
source $env(CSF_OCCTSamplesPath)/tcl/pathtrace_ball.tcl
vtexture ball 11 -scale 0.1 0.1
vsetmaterial ball plaster
vbsdf ball -coatFresnel Constant 0.0
vfps 100
vdump $imagedir/${casename}_zoom.png