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Cycles: Store proper empty boundbox for missing child nodes in QBVH

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The idea is to make sure those childs would never be intersected with a ray
in order to make it so kernel never worries about number of child nodes.
This commit is contained in:
Sergey Sharybin 2014-12-25 00:14:12 +05:00
parent 30b12b1b27
commit 788fb8321a
1 changed files with 10 additions and 6 deletions
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16
intern/cycles/bvh/bvh.cpp
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@ -721,13 +721,17 @@ void QBVH::pack_inner(const BVHStackEntry& e, const BVHStackEntry *en, int num)
}
for(int i = num; i < 4; i++) {
data[0][i] = 0.0f;
data[1][i] = 0.0f;
data[2][i] = 0.0f;
/* We store BB which would never be recorded as intersection
* so kernel might safely assume there are always 4 child nodes.
*/
data[0][i] = FLT_MAX;
data[1][i] = -FLT_MAX;
data[3][i] = 0.0f;
data[4][i] = 0.0f;
data[5][i] = 0.0f;
data[2][i] = FLT_MAX;
data[3][i] = -FLT_MAX;
data[4][i] = FLT_MAX;
data[5][i] = -FLT_MAX;
data[6][i] = __int_as_float(0);
}