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Cycles: Consider GGX/Beckmann/Ashikhmin of 0 roughness a singular ray

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This matches behavior of Multiscatter GGX and could become handy later on
when/if we decide it would be beneficial to replace on closure with another.

Reviewers: lukasstockner97, brecht

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D2413
This commit is contained in:
Sergey Sharybin 2016-12-06 15:57:16 +01:00
parent 72d18c195e
commit c4d6fd3ec0
2 changed files with 17 additions and 3 deletions
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4
intern/cycles/kernel/closure/bsdf_ashikhmin_shirley.h
View File

@ -143,6 +143,7 @@ ccl_device int bsdf_ashikhmin_shirley_sample(const ShaderClosure *sc, float3 Ng,
{
const MicrofacetBsdf *bsdf = (const MicrofacetBsdf*)sc;
float3 N = bsdf->N;
int label = LABEL_REFLECT | LABEL_GLOSSY;
float NdotI = dot(N, I);
if(NdotI > 0.0f) {
@ -211,6 +212,7 @@ ccl_device int bsdf_ashikhmin_shirley_sample(const ShaderClosure *sc, float3 Ng,
/* Some high number for MIS. */
*pdf = 1e6f;
*eval = make_float3(1e6f, 1e6f, 1e6f);
label = LABEL_REFLECT | LABEL_SINGULAR;
}
else {
/* leave the rest to eval_reflect */
@ -224,7 +226,7 @@ ccl_device int bsdf_ashikhmin_shirley_sample(const ShaderClosure *sc, float3 Ng,
#endif
}
return LABEL_REFLECT|LABEL_GLOSSY;
return label;
}

16
intern/cycles/kernel/closure/bsdf_microfacet.h
View File

@ -452,6 +452,7 @@ ccl_device int bsdf_microfacet_ggx_sample(KernelGlobals *kg, const ShaderClosure
float alpha_y = bsdf->alpha_y;
bool m_refractive = bsdf->type == CLOSURE_BSDF_MICROFACET_GGX_REFRACTION_ID;
float3 N = bsdf->N;
int label;
float cosNO = dot(N, I);
if(cosNO > 0) {
@ -477,6 +478,7 @@ ccl_device int bsdf_microfacet_ggx_sample(KernelGlobals *kg, const ShaderClosure
/* reflection or refraction? */
if(!m_refractive) {
float cosMO = dot(m, I);
label = LABEL_REFLECT | LABEL_GLOSSY;
if(cosMO > 0) {
/* eq. 39 - compute actual reflected direction */
@ -487,6 +489,7 @@ ccl_device int bsdf_microfacet_ggx_sample(KernelGlobals *kg, const ShaderClosure
/* some high number for MIS */
*pdf = 1e6f;
*eval = make_float3(1e6f, 1e6f, 1e6f);
label = LABEL_REFLECT | LABEL_SINGULAR;
}
else {
/* microfacet normal is visible to this ray */
@ -549,6 +552,8 @@ ccl_device int bsdf_microfacet_ggx_sample(KernelGlobals *kg, const ShaderClosure
}
}
else {
label = LABEL_TRANSMIT | LABEL_GLOSSY;
/* CAUTION: the i and o variables are inverted relative to the paper
* eq. 39 - compute actual refractive direction */
float3 R, T;
@ -576,6 +581,7 @@ ccl_device int bsdf_microfacet_ggx_sample(KernelGlobals *kg, const ShaderClosure
/* some high number for MIS */
*pdf = 1e6f;
*eval = make_float3(1e6f, 1e6f, 1e6f);
label = LABEL_TRANSMIT | LABEL_SINGULAR;
}
else {
/* eq. 33 */
@ -607,7 +613,7 @@ ccl_device int bsdf_microfacet_ggx_sample(KernelGlobals *kg, const ShaderClosure
}
}
}
return (m_refractive) ? LABEL_TRANSMIT|LABEL_GLOSSY : LABEL_REFLECT|LABEL_GLOSSY;
return label;
}
/* Beckmann microfacet with Smith shadow-masking from:
@ -815,6 +821,7 @@ ccl_device int bsdf_microfacet_beckmann_sample(KernelGlobals *kg, const ShaderCl
float alpha_y = bsdf->alpha_y;
bool m_refractive = bsdf->type == CLOSURE_BSDF_MICROFACET_BECKMANN_REFRACTION_ID;
float3 N = bsdf->N;
int label;
float cosNO = dot(N, I);
if(cosNO > 0) {
@ -839,6 +846,7 @@ ccl_device int bsdf_microfacet_beckmann_sample(KernelGlobals *kg, const ShaderCl
/* reflection or refraction? */
if(!m_refractive) {
label = LABEL_REFLECT | LABEL_GLOSSY;
float cosMO = dot(m, I);
if(cosMO > 0) {
@ -850,6 +858,7 @@ ccl_device int bsdf_microfacet_beckmann_sample(KernelGlobals *kg, const ShaderCl
/* some high number for MIS */
*pdf = 1e6f;
*eval = make_float3(1e6f, 1e6f, 1e6f);
label = LABEL_REFLECT | LABEL_SINGULAR;
}
else {
/* microfacet normal is visible to this ray
@ -904,6 +913,8 @@ ccl_device int bsdf_microfacet_beckmann_sample(KernelGlobals *kg, const ShaderCl
}
}
else {
label = LABEL_TRANSMIT | LABEL_GLOSSY;
/* CAUTION: the i and o variables are inverted relative to the paper
* eq. 39 - compute actual refractive direction */
float3 R, T;
@ -931,6 +942,7 @@ ccl_device int bsdf_microfacet_beckmann_sample(KernelGlobals *kg, const ShaderCl
/* some high number for MIS */
*pdf = 1e6f;
*eval = make_float3(1e6f, 1e6f, 1e6f);
label = LABEL_TRANSMIT | LABEL_SINGULAR;
}
else {
/* eq. 33 */
@ -963,7 +975,7 @@ ccl_device int bsdf_microfacet_beckmann_sample(KernelGlobals *kg, const ShaderCl
}
}
}
return (m_refractive) ? LABEL_TRANSMIT|LABEL_GLOSSY : LABEL_REFLECT|LABEL_GLOSSY;
return label;
}
CCL_NAMESPACE_END