forked from bartvdbraak/blender
Fix T38615: cycles rendering beckmann/GGX refraction wrong with IOR equal to 1.
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@ -219,7 +219,7 @@ ccl_device int bsdf_microfacet_ggx_sample(const ShaderClosure *sc, float3 Ng, fl
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*domega_in_dy = dTdy;
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#endif
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if (m_ag <= 1e-4f) {
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if (m_ag <= 1e-4f || fabsf(m_eta - 1.0f) < 1e-4f) {
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// some high number for MIS
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*pdf = 1e6f;
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*eval = make_float3(1e6f, 1e6f, 1e6f);
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@ -450,7 +450,7 @@ ccl_device int bsdf_microfacet_beckmann_sample(const ShaderClosure *sc, float3 N
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*domega_in_dx = dTdx;
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*domega_in_dy = dTdy;
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#endif
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if (m_ab <= 1e-4f) {
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if (m_ab <= 1e-4f || fabsf(m_eta - 1.0f) < 1e-4f) {
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// some high number for MIS
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*pdf = 1e6f;
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*eval = make_float3(1e6f, 1e6f, 1e6f);
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