[Bf-blender-cvs] [2e2c24b] master: Cycles: Update some comments in volume code.

[Thomas Dinges]

Commit: 2e2c24bec1b7529c027f61b3d012b78c8c6605b2
Author: Thomas Dinges
Date:   Thu Nov 13 11:29:54 2014 +0100
Branches: master
https://developer.blender.org/rB2e2c24bec1b7529c027f61b3d012b78c8c6605b2

Cycles: Update some comments in volume code.

===================================================================

M	intern/cycles/kernel/kernel_volume.h

===================================================================

diff --git a/intern/cycles/kernel/kernel_volume.h b/intern/cycles/kernel/kernel_volume.h
index dabe403..6a39ba9 100644
--- a/intern/cycles/kernel/kernel_volume.h
+++ b/intern/cycles/kernel/kernel_volume.h
@@ -581,7 +581,8 @@ ccl_device_noinline VolumeIntegrateResult kernel_volume_integrate(KernelGlobals
  * through a volume. This can then latter be used for decoupled sampling as in:
  * "Importance Sampling Techniques for Path Tracing in Participating Media"
  *
- * On the GPU this is only supported for homogeneous volumes (1 step), due to
+ * On the GPU this is only supported (but currently not enabled)
+ * for homogeneous volumes (1 step), due to
  * no support for malloc/free and too much stack usage with a fix size array. */
 
 typedef struct VolumeStep {
@@ -735,12 +736,8 @@ ccl_device void kernel_volume_decoupled_free(KernelGlobals *kg, VolumeSegment *s
 }
 
 /* scattering for homogeneous and heterogeneous volumes, using decoupled ray
- * marching. unlike the non-decoupled functions, these do not do probalistic
- * scattering, they always scatter if there is any non-zero scattering
- * coefficient.
+ * marching. this function does not do emission or modify throughput. 
  *
- * these also do not do emission or modify throughput. 
- * 
  * function is expected to return VOLUME_PATH_SCATTERED when probalistic_scatter is false */
 ccl_device VolumeIntegrateResult kernel_volume_decoupled_scatter(
 	KernelGlobals *kg, PathState *state, Ray *ray, ShaderData *sd,