New math function to add small bias to zero axis

In some situations the zero axis can produce problems and need to add a small bias.

This function adds a small bias using the orthogonal result of the others valid axis.

Reviewed By: fclem

Differential Revision: https://developer.blender.org/D16158
6d

1 files changed, 2 insertions, 0 deletions

diff --git a/source/blender/blenlib/BLI_math_matrix.h b/source/blender/blenlib/BLI_math_matrix.h
index 19943614881..7e1b7c2ba56 100644
--- a/source/blender/blenlib/BLI_math_matrix.h
+++ b/source/blender/blenlib/BLI_math_matrix.h
@@ -367,6 +367,8 @@ void pseudoinverse_m4_m4(float inverse[4][4], const float mat[4][4], float epsil
 void pseudoinverse_m3_m3(float inverse[3][3], const float mat[3][3], float epsilon);
 
 bool has_zero_axis_m4(const float matrix[4][4]);
+/** Fix any zero scale axis adding a small bias orthogonal to the other valid axis. */
+void zero_axis_bias_m4(float mat[4][4]);
 
 void invert_m4_m4_safe(float inverse[4][4], const float mat[4][4]);