Fix #33497: seting object scale to 0 on one axis made moving verts in edit mode

impossible. In this case matrix inversion failed and didn't give a useful result.
Now it falls back to a pseudoinverse in that case, so that moving along the
other axes still works.

There may be other places that can benefit from this, but this is a place where
it has no significant performance impact, doing this in general for e.g. bone
matrices could be quite slow.

1 files changed, 4 insertions, 0 deletions

diff --git a/source/blender/blenlib/BLI_math_matrix.h b/source/blender/blenlib/BLI_math_matrix.h
index c97eb4c588c..c12ec62ca1b 100644
--- a/source/blender/blenlib/BLI_math_matrix.h
+++ b/source/blender/blenlib/BLI_math_matrix.h
@@ -144,10 +144,14 @@ float determinant_m2(float a, float b,
 float determinant_m3(float a, float b, float c,
                      float d, float e, float f,
                      float g, float h, float i);
+float determinant_m3_array(float m[3][3]);
 float determinant_m4(float A[4][4]);
 
+#define PSEUDOINVERSE_EPSILON 1e-8f
+
 void svd_m4(float U[4][4], float s[4], float V[4][4], float A[4][4]);
 void pseudoinverse_m4_m4(float Ainv[4][4], float A[4][4], float epsilon);
+void pseudoinverse_m3_m3(float Ainv[3][3], float A[3][3], float epsilon);
 
 /****************************** Transformations ******************************/