Approximate Ambient Occlusion

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

A new approximate ambient occlusion method has been added, next to the
existing one based on raytracing. This method is specifically targetted
at use in animations, since it is inherently noise free, and so will
not flicker across frames.

http://www.blender.org/development/current-projects/changes-since-244/approximate-ambient-occlusion/
http://peach.blender.org/index.php/approximate-ambient-occlusion/

Further improvements are still needed, but it can be tested already. There
are still a number of known issues:

- Bias errors on backfaces.
- For performance, instanced object do not occlude currently.
- Sky textures don't work well, the derivatives for texture evaluation
  are not correct.
- Multiple passes do not work entirely correct (they are not accurate
  to begin with, but could be better).

1 files changed, 7 insertions, 3 deletions

diff --git a/source/blender/makesdna/DNA_world_types.h b/source/blender/makesdna/DNA_world_types.h
index 9e5ec4cdb9a..e7a8d839227 100644
--- a/source/blender/makesdna/DNA_world_types.h
+++ b/source/blender/makesdna/DNA_world_types.h
@@ -104,9 +104,8 @@ typedef struct World {
 	float aodist, aodistfac, aoenergy, aobias;
 	short aomode, aosamp, aomix, aocolor;
 	float ao_adapt_thresh, ao_adapt_speed_fac;
-	float pad2[2];
-	short ao_samp_method;
-	short pad1[3];
+	float ao_approx_error, ao_approx_correction;
+	short ao_samp_method, ao_gather_method, ao_approx_passes, pad1;
 	
 	float *aosphere, *aotables;
 	
@@ -151,12 +150,17 @@ typedef struct World {
 /* aomode (use distances & random sampling modes) */
 #define WO_AODIST		1
 #define WO_AORNDSMP		2
+#define WO_AOCACHE		4
 
 /* aocolor */
 #define WO_AOPLAIN	0
 #define WO_AOSKYCOL	1
 #define WO_AOSKYTEX	2
 
+/* ao_gather_method */
+#define WO_AOGATHER_RAYTRACE	0
+#define WO_AOGATHER_APPROX		1
+
 /* texco (also in DNA_material_types.h) */
 #define TEXCO_ANGMAP	64
 #define TEXCO_H_SPHEREMAP	256