Fix #36620: sss + indirect light rendering artifacts, due to wrong correlation in

the random numbers.

2 files changed, 4 insertions, 4 deletions

diff --git a/intern/cycles/kernel/kernel_path.h b/intern/cycles/kernel/kernel_path.h
index 8cb83e0797e..36aaba2aac5 100644
--- a/intern/cycles/kernel/kernel_path.h
+++ b/intern/cycles/kernel/kernel_path.h
@@ -791,10 +791,10 @@ __device float4 kernel_path_integrate(KernelGlobals *kg, RNG *rng, int sample, R
 						hit_state.flag |= PATH_RAY_BSSRDF_ANCESTOR;
 						
 						if(kernel_path_integrate_lighting(kg, rng, sample, num_samples, &bssrdf_sd[hit],
-							&tp, &hit_min_ray_pdf, &hit_ray_pdf, &hit_state, rng_offset, &L, &hit_ray, &hit_ray_t)) {
+							&tp, &hit_min_ray_pdf, &hit_ray_pdf, &hit_state, rng_offset+PRNG_BOUNCE_NUM, &L, &hit_ray, &hit_ray_t)) {
 							kernel_path_indirect(kg, rng, sample, hit_ray, buffer,
 								tp, num_samples, num_samples,
-								hit_min_ray_pdf, hit_ray_pdf, hit_state, rng_offset+PRNG_BOUNCE_NUM, &L);
+								hit_min_ray_pdf, hit_ray_pdf, hit_state, rng_offset+PRNG_BOUNCE_NUM*2, &L);
 
 							/* for render passes, sum and reset indirect light pass variables
 							 * for the next samples */
@@ -1265,7 +1265,7 @@ __device float4 kernel_branched_path_integrate(KernelGlobals *kg, RNG *rng, int
 							kernel_branched_path_integrate_lighting(kg, rng, sample*num_samples + j,
 								aa_samples*num_samples,
 								&bssrdf_sd[hit], throughput, num_samples_inv,
-								ray_pdf, ray_pdf, state, rng_offset, &L, buffer);
+								ray_pdf, ray_pdf, state, rng_offset+PRNG_BOUNCE_NUM, &L, buffer);
 					}
 				}
 
diff --git a/intern/cycles/render/integrator.cpp b/intern/cycles/render/integrator.cpp
index 47b1930e27c..88466f24ec5 100644
--- a/intern/cycles/render/integrator.cpp
+++ b/intern/cycles/render/integrator.cpp
@@ -126,7 +126,7 @@ void Integrator::device_update(Device *device, DeviceScene *dscene, Scene *scene
 		max_samples = max(max_samples, max(ao_samples, max(mesh_light_samples, subsurface_samples)));
 	}
 
-	max_samples *= (max_bounce + transparent_max_bounce + 2);
+	max_samples *= (max_bounce + transparent_max_bounce + 3);
 
 	int dimensions = PRNG_BASE_NUM + max_samples*PRNG_BOUNCE_NUM;
 	dimensions = min(dimensions, SOBOL_MAX_DIMENSIONS);