mathutils.geometry.distance_point_to_plane(pt, plane_co, plane_no) - utility function, BLI math version too.

2 files changed, 13 insertions, 0 deletions

diff --git a/source/blender/blenlib/BLI_math_geom.h b/source/blender/blenlib/BLI_math_geom.h
index 8a42414ea9f..99687ae8bb4 100644
--- a/source/blender/blenlib/BLI_math_geom.h
+++ b/source/blender/blenlib/BLI_math_geom.h
@@ -60,6 +60,7 @@ float dist_to_line_v2(const float p[2], const float l1[2], const float l2[2]);
 float dist_to_line_segment_v2(const float p[2], const float l1[2], const float l2[2]);
 void closest_to_line_segment_v2(float closest[2], const float p[2], const float l1[2], const float l2[2]);
 
+float dist_to_plane_v3(const float p[2], const float plane_co[3], const float plane_no[2]);
 float dist_to_line_segment_v3(const float p[3], const float l1[3], const float l2[3]);
 float closest_to_line_v3(float r[3], const float p[3], const float l1[3], const float l2[3]);
 float closest_to_line_v2(float r[2], const float p[2], const float l1[2], const float l2[2]);
diff --git a/source/blender/blenlib/intern/math_geom.c b/source/blender/blenlib/intern/math_geom.c
index 99ead8e9d6a..a135cb43882 100644
--- a/source/blender/blenlib/intern/math_geom.c
+++ b/source/blender/blenlib/intern/math_geom.c
@@ -237,6 +237,18 @@ void closest_to_line_segment_v3(float closest[3], const float v1[3], const float
 		copy_v3_v3(closest, cp);
 }
 
+/* signed distance from the point to the plane in 3D */
+float dist_to_plane_v3(const float p[2], const float plane_co[3], const float plane_no[2])
+{
+	float plane_no_unit[3];
+	float plane_co_other[3];
+
+	normalize_v3_v3(plane_no_unit, plane_no);
+	add_v3_v3v3(plane_co_other, plane_co, plane_no_unit);
+
+	return -line_point_factor_v3(p, plane_co, plane_co_other);
+}
+
 /* distance v1 to line-piece v2-v3 in 3D */
 float dist_to_line_segment_v3(const float v1[3], const float v2[3], const float v3[3])
 {