added math function isect_line_plane_v3(), use for window_to_3d rather then having it inline.

1 files changed, 12 insertions, 0 deletions

diff --git a/source/blender/blenlib/BLI_math_geom.h b/source/blender/blenlib/BLI_math_geom.h
index 4a7d749842d..634634f02e5 100644
--- a/source/blender/blenlib/BLI_math_geom.h
+++ b/source/blender/blenlib/BLI_math_geom.h
@@ -96,6 +96,18 @@ int isect_line_line_strict_v3(const float v1[3], const float v2[3],
 int isect_ray_plane_v3(float p1[3], float d[3], float v0[3], 
 					   float v1[3], float v2[3], float *lambda, int clip);
 
+/**
+ * Intersect line/plane, optionally treat line as directional (like a ray) with the no_flip argument.
+ * @param out The intersection point.
+ * @param l1 The first point of the line.
+ * @param l2 The second point of the line.
+ * @param plane_co A point on the plane to intersect with.
+ * @param plane_no The direction of the plane (does not need to be normalized).
+ * @param no_flip When true, the intersection point will always be from l1 to l2, even if this is not on the plane.
+ */
+int isect_line_plane_v3(float out[3], const float l1[3], const float l2[3],
+                        const float plane_co[3], const float plane_no[3], const short no_flip);
+
 /* line/ray triangle */
 int isect_line_tri_v3(const float p1[3], const float p2[3],
 	const float v0[3], const float v1[3], const float v2[3], float *lambda, float uv[2]);