Commit: 8047aecf4bd713070646c521859fd13d3f6919db
Author: Sergey Sharybin
Date: Mon Jun 6 15:56:22 2016 +0200
Branches: compositor-2016
https://developer.blender.org/rB8047aecf4bd713070646c521859fd13d3f6919db
Fix T48571: Cycles/GPU - A lot of fireflies on SSS+Volume
Was some accumulated precision error happening.
===================================================================
M intern/cycles/kernel/kernel_volume.h
===================================================================
diff --git a/intern/cycles/kernel/kernel_volume.h
b/intern/cycles/kernel/kernel_volume.h
index e1ea60f..0e313b8 100644
--- a/intern/cycles/kernel/kernel_volume.h
+++ b/intern/cycles/kernel/kernel_volume.h
@@ -1216,6 +1216,7 @@ ccl_device void
kernel_volume_stack_update_for_subsurface(KernelGlobals *kg,
# else
Intersection isect;
int step = 0;
+ float3 Pend = ray->P + ray->D*ray->t;
while(step < 2 * VOLUME_STACK_SIZE &&
scene_intersect_volume(kg,
&volume_ray,
@@ -1227,7 +1228,9 @@ ccl_device void
kernel_volume_stack_update_for_subsurface(KernelGlobals *kg,
/* Move ray forward. */
volume_ray.P = ray_offset(stack_sd->P, -stack_sd->Ng);
- volume_ray.t -= stack_sd->ray_length;
+ if(volume_ray.t != FLT_MAX) {
+ volume_ray.D = normalize_len(Pend - volume_ray.P,
&volume_ray.t);
+ }
++step;
}
# endif
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