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Bounding box clipping in the render engine.

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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.
This commit is contained in:
Brecht Van Lommel
2008-01-29 12:20:42 +00:00
parent 5bf5b030e5
commit 8e94028ed5
8 changed files with 211 additions and 97 deletions
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22
source/blender/blenkernel/intern/particle_system.c
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@@ -780,6 +780,21 @@ void *exec_distribution(void *data)
return 0;
}
/* not thread safe, but qsort doesn't take userdata argument */
static int *COMPARE_ORIG_INDEX = NULL;
static int compare_orig_index(const void *p1, const void *p2)
{
int index1 = COMPARE_ORIG_INDEX[*(const int*)p1];
int index2 = COMPARE_ORIG_INDEX[*(const int*)p2];
if(index1 < index2)
return -1;
else if(index1 == index2)
return 0;
else
return 1;
}
/* creates a distribution of coordinates on a DerivedMesh */
/* */
/* 1. lets check from what we are emitting */
@@ -1157,6 +1172,13 @@ int psys_threads_init_distribution(ParticleThread *threads, DerivedMesh *finaldm
MEM_freeN(sum);
/* for hair, sort by origindex, allows optimizations in rendering */
if(part->type == PART_HAIR) {
COMPARE_ORIG_INDEX= dm->getFaceDataArray(dm, CD_ORIGINDEX);
if(COMPARE_ORIG_INDEX)
qsort(index, totpart, sizeof(int), compare_orig_index);
}
/* weights are no longer used except for FROM_PARTICLE, which needs them zeroed for indexing */
if(from==PART_FROM_PARTICLE){
for(i=0; i<tot; i++)