[Bf-blender-cvs] [439ccd27e6a] blender2.8: BLI_math: Added isect_point_planes_v3_negated function.

[Germano]

Commit: 439ccd27e6a454c716404efa55b4c750c13f2549
Author: Germano
Date:   Tue May 15 14:10:41 2018 -0300
Branches: blender2.8
https://developer.blender.org/rB439ccd27e6a454c716404efa55b4c750c13f2549

BLI_math: Added isect_point_planes_v3_negated function.

===================================================================

M	source/blender/blenlib/BLI_math_geom.h
M	source/blender/blenlib/intern/math_geom.c

===================================================================

diff --git a/source/blender/blenlib/BLI_math_geom.h b/source/blender/blenlib/BLI_math_geom.h
index 940e22b144a..111450b6402 100644
--- a/source/blender/blenlib/BLI_math_geom.h
+++ b/source/blender/blenlib/BLI_math_geom.h
@@ -244,6 +244,9 @@ bool isect_ray_plane_v3(
         float *r_lambda, const bool clip);
 
 bool isect_point_planes_v3(float (*planes)[4], int totplane, const float p[3]);
+bool isect_point_planes_v3_negated(
+        const float (*planes)[4], const int totplane, const float p[3]);
+
 bool isect_line_plane_v3(
         float r_isect_co[3], const float l1[3], const float l2[3],
         const float plane_co[3], const float plane_no[3]) ATTR_WARN_UNUSED_RESULT;
diff --git a/source/blender/blenlib/intern/math_geom.c b/source/blender/blenlib/intern/math_geom.c
index 34c8b9fabe6..0e7358aa426 100644
--- a/source/blender/blenlib/intern/math_geom.c
+++ b/source/blender/blenlib/intern/math_geom.c
@@ -2002,6 +2002,23 @@ bool isect_point_planes_v3(float (*planes)[4], int totplane, const float p[3])
 	return true;
 }
 
+/**
+ * Check if a point is in front all planes.
+ * Same as isect_point_planes_v3 but with planes facing the opposite direction.
+ */
+bool isect_point_planes_v3_negated(
+	const float(*planes)[4], const int totplane, const float p[3])
+{
+	for (int i = 0; i < totplane; i++) {
+		if (plane_point_side_v3(planes[i], p) <= 0.0f) {
+			return false;
+		}
+	}
+
+	return true;
+}
+
+
 /**
  * Intersect line/plane.
  *