Cycles Volume Render: heterogeneous (textured) volumes support.

Volumes can now have textured colors and density. There is a Volume Sampling
panel in the Render properties with these settings:

* Step size: distance between volume shader samples when rendering the volume.
  Lower values give more accurate and detailed results but also increased render
  time.
* Max steps: maximum number of steps through the volume before giving up, to
  protect from extremely long render times with big objects or small step sizes.

This is much more compute intensive than homogeneous volume, so when you are not
using a texture you should enable the Homogeneous Volume option in the material
or world for faster rendering.

One important missing feature is that Generated texture coordinates are not yet
working in volumes, and they are the default coordinates for nearly all texture
nodes. So until that works you need to plug in object texture coordinates or a
world space position.

This is work by "storm", Stuart Broadfoot, Thomas Dinges and myself.

1 files changed, 1 insertions, 1 deletions

diff --git a/intern/cycles/render/shader.h b/intern/cycles/render/shader.h
index 6869a651b46..5f87050fe19 100644
--- a/intern/cycles/render/shader.h
+++ b/intern/cycles/render/shader.h
@@ -62,7 +62,7 @@ public:
 	/* sampling */
 	bool use_mis;
 	bool use_transparent_shadow;
-	bool homogeneous_volume;
+	bool heterogeneous_volume;
 
 	/* synchronization */
 	bool need_update;