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Fix Cycles bevel normal baking having some random incorrect pixels. 

The bevel and SSS code could result in NaNs in some cases, tweak the
formulas so this can't happen.
This commit is contained in:
Brecht Van Lommel 2018-01-11 22:25:40 +01:00
parent 6b3d85fa51
commit 2dbcc17897
Notes: blender-bot 2023-02-14 07:31:32 +01:00 
Referenced by issue #53791, shape keys looks different between viewport and render
2 changed files with 24 additions and 23 deletions
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34
intern/cycles/kernel/kernel_subsurface.h
View File

@ -283,22 +283,23 @@ ccl_device_inline int subsurface_scatter_multi_intersect(
object_normal_transform(kg, sd, &hit_Ng);
}
/* probability densities for local frame axes */
/* Probability densities for local frame axes. */
float pdf_N = pick_pdf_N * fabsf(dot(disk_N, hit_Ng));
float pdf_T = pick_pdf_T * fabsf(dot(disk_T, hit_Ng));
float pdf_B = pick_pdf_B * fabsf(dot(disk_B, hit_Ng));
/* multiple importance sample between 3 axes, power heuristic
* found to be slightly better than balance heuristic */
float mis_weight = power_heuristic_3(pdf_N, pdf_T, pdf_B);
/* Multiple importance sample between 3 axes, power heuristic
* found to be slightly better than balance heuristic. pdf_N
* in the MIS weight and denominator cancelled out. */
float w = pdf_N / (sqr(pdf_N) + sqr(pdf_T) + sqr(pdf_B));
if(ss_isect->num_hits > BSSRDF_MAX_HITS) {
w *= ss_isect->num_hits/(float)BSSRDF_MAX_HITS;
}
/* real distance to sampled point */
/* Real distance to sampled point. */
float r = len(hit_P - sd->P);
/* evaluate */
float w = mis_weight / pdf_N;
if(ss_isect->num_hits > BSSRDF_MAX_HITS)
w *= ss_isect->num_hits/(float)BSSRDF_MAX_HITS;
/* Evaluate profiles. */
float3 eval = subsurface_scatter_eval(sd, sc, disk_r, r, all) * w;
ss_isect->weight[hit] = eval;
@ -417,20 +418,21 @@ ccl_device void subsurface_scatter_step(KernelGlobals *kg, ShaderData *sd, ccl_a
/* setup new shading point */
shader_setup_from_subsurface(kg, sd, &ss_isect.hits[0], &ray);
/* probability densities for local frame axes */
/* Probability densities for local frame axes. */
float pdf_N = pick_pdf_N * fabsf(dot(disk_N, sd->Ng));
float pdf_T = pick_pdf_T * fabsf(dot(disk_T, sd->Ng));
float pdf_B = pick_pdf_B * fabsf(dot(disk_B, sd->Ng));
/* multiple importance sample between 3 axes, power heuristic
* found to be slightly better than balance heuristic */
float mis_weight = power_heuristic_3(pdf_N, pdf_T, pdf_B);
/* Multiple importance sample between 3 axes, power heuristic
* found to be slightly better than balance heuristic. pdf_N
* in the MIS weight and denominator cancelled out. */
float w = pdf_N / (sqr(pdf_N) + sqr(pdf_T) + sqr(pdf_B));
w *= ss_isect.num_hits;
/* real distance to sampled point */
/* Real distance to sampled point. */
float r = len(sd->P - origP);
/* evaluate */
float w = (mis_weight * ss_isect.num_hits) / pdf_N;
/* Evaluate profiles. */
eval = subsurface_scatter_eval(sd, sc, disk_r, r, all) * w;
}

13
intern/cycles/kernel/svm/svm_bevel.h
View File

@ -174,18 +174,17 @@ ccl_device_noinline float3 svm_bevel(
float pdf_B = pick_pdf_B * fabsf(dot(disk_B, hit_Ng));
/* Multiple importance sample between 3 axes, power heuristic
* found to be slightly better than balance heuristic. */
float mis_weight = power_heuristic_3(pdf_N, pdf_T, pdf_B);
* found to be slightly better than balance heuristic. pdf_N
* in the MIS weight and denominator cancelled out. */
float w = pdf_N / (sqr(pdf_N) + sqr(pdf_T) + sqr(pdf_B));
if(isect.num_hits > LOCAL_MAX_HITS) {
w *= isect.num_hits/(float)LOCAL_MAX_HITS;
}
/* Real distance to sampled point. */
float r = len(hit_P - sd->P);
/* Compute weight. */
float w = mis_weight / pdf_N;
if(isect.num_hits > LOCAL_MAX_HITS) {
w *= isect.num_hits/(float)LOCAL_MAX_HITS;
}
float pdf = bssrdf_cubic_pdf(radius, 0.0f, r);
float disk_pdf = bssrdf_cubic_pdf(radius, 0.0f, disk_r);