diff options
Diffstat (limited to 'source/blender/blenlib/intern/math_geom.c')
| -rw-r--r-- | source/blender/blenlib/intern/math_geom.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/source/blender/blenlib/intern/math_geom.c b/source/blender/blenlib/intern/math_geom.c index 5f3ab5eb73e..efb881cde1b 100644 --- a/source/blender/blenlib/intern/math_geom.c +++ b/source/blender/blenlib/intern/math_geom.c @@ -238,6 +238,18 @@ float volume_tetrahedron_v3(const float v1[3], const float v2[3], const float v3 return fabsf(determinant_m3_array(m)) / 6.0f; } +/** + * The volume from a tetrahedron, normal pointing inside gives negative volume + */ +float volume_tetrahedron_signed_v3(const float v1[3], const float v2[3], const float v3[3], const float v4[3]) +{ + float m[3][3]; + sub_v3_v3v3(m[0], v1, v2); + sub_v3_v3v3(m[1], v2, v3); + sub_v3_v3v3(m[2], v3, v4); + return determinant_m3_array(m) / 6.0f; +} + /********************************* Distance **********************************/ |