Bounding box clipping in the render engine.

Now bounding boxes are computed per object, and checked first before
zbuffering objects. For strands, bounding boxes are computed per
original face in the mesh. Overall the speed improvement from this 
is quite small (zbuffering is rarely the bottleneck), but it seems a
sensible thing to do anyway.

1 files changed, 1 insertions, 0 deletions

diff --git a/source/blender/render/intern/include/strand.h b/source/blender/render/intern/include/strand.h
index f001bc42112..ebe026e3fec 100644
--- a/source/blender/render/intern/include/strand.h
+++ b/source/blender/render/intern/include/strand.h
@@ -93,6 +93,7 @@ typedef struct StrandShadeCache StrandShadeCache;
 
 void strand_eval_point(StrandSegment *sseg, StrandPoint *spoint);
 void render_strand_segment(struct Render *re, float winmat[][4], struct StrandPart *spart, struct ZSpan *zspan, int totzspan, StrandSegment *sseg);
+void strand_minmax(struct StrandRen *strand, float *min, float *max);
 
 struct StrandSurface *cache_strand_surface(struct Render *re, struct ObjectRen *obr, struct DerivedMesh *dm, float mat[][4], int timeoffset);
 void free_strand_surface(struct Render *re);