New math util funcitons:

- equals_v2v2
- project_v2_v2v2
- isect_seg_seg_v2_point
which would be necessery for my further multires interpolation commit

M_Geometry_LineIntersect2D now uses isect_seg_seg_v2_point(). Behaviour of this
function was changed a bit -- it haven't returned intersection point in several
cases when two segments are making angle.

1 files changed, 10 insertions, 0 deletions

diff --git a/source/blender/blenlib/intern/math_vector.c b/source/blender/blenlib/intern/math_vector.c
index 35476a8aba9..6ac1fcfab7e 100644
--- a/source/blender/blenlib/intern/math_vector.c
+++ b/source/blender/blenlib/intern/math_vector.c
@@ -231,6 +231,16 @@ void angle_quad_v3(float angles[4], const float v1[3], const float v2[3], const
 /********************************* Geometry **********************************/
 
 /* Project v1 on v2 */
+void project_v2_v2v2(float c[2], const float v1[2], const float v2[2])
+{
+	float mul;
+	mul = dot_v2v2(v1, v2) / dot_v2v2(v2, v2);
+
+	c[0] = mul * v2[0];
+	c[1] = mul * v2[1];
+}
+
+/* Project v1 on v2 */
 void project_v3_v3v3(float c[3], const float v1[3], const float v2[3])
 {
 	float mul;