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Cycles: Fix issues with quick inverse of degenerate matrix

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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);