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Cycles: Fix issues with quick inverse of degenerate matrix 

This fixes part of the issues reported in T46322. Still need to solve
issue with wrong intersection distance scaling.
This commit is contained in:
Sergey Sharybin 2015-10-08 21:14:14 +05:00
parent 8fa4fccec4
commit 4974ed93ef
1 changed files with 6 additions and 1 deletions
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7
intern/cycles/util/util_transform.h
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@ -347,7 +347,12 @@ ccl_device_inline Transform transform_quick_inverse(Transform M)
* scale can be inverted but what about shearing? */
Transform R;
float det = M.x.x*(M.z.z*M.y.y - M.z.y*M.y.z) - M.y.x*(M.z.z*M.x.y - M.z.y*M.x.z) + M.z.x*(M.y.z*M.x.y - M.y.y*M.x.z);
if(det == 0.0f) {
M[0][0] += 1e-8f;
M[1][1] += 1e-8f;
M[2][2] += 1e-8f;
det = M.x.x*(M.z.z*M.y.y - M.z.y*M.y.z) - M.y.x*(M.z.z*M.x.y - M.z.y*M.x.z) + M.z.x*(M.y.z*M.x.y - M.y.y*M.x.z);
}
det = (det != 0.0f)? 1.0f/det: 0.0f;
float3 Rx = det*make_float3(M.z.z*M.y.y - M.z.y*M.y.z, M.z.y*M.x.z - M.z.z*M.x.y, M.y.z*M.x.y - M.y.y*M.x.z);