Commit: 421d0f3bdea56ef056372476a24b1fc5e5ee06e5
Author: Campbell Barton
Date: Mon Feb 16 18:47:15 2015 +1100
Branches: master
https://developer.blender.org/rB421d0f3bdea56ef056372476a24b1fc5e5ee06e5
Math Lib: add dist_signed_squared_to_corner_v3v3v3
Can be used to check if a point is inside the 2-planes defined by a face-corner.
===================================================================
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 495aa6b..f9cce27 100644
--- a/source/blender/blenlib/BLI_math_geom.h
+++ b/source/blender/blenlib/BLI_math_geom.h
@@ -104,6 +104,10 @@ float dist_squared_to_line_segment_v3(const float p[3],
const float l1[3], const
float dist_to_line_segment_v3(const float p[3], const float l1[3],
const float l2[3]);
float dist_squared_to_line_v3(const float p[3], const float l1[3], const float
l2[3]);
float dist_to_line_v3(const float p[3], const float l1[3], const float
l2[3]);
+float dist_signed_squared_to_corner_v3v3v3(
+ const float p[3],
+ const float v1[3], const float v2[3], const float v3[3],
+ const float axis_fallback[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]);
void closest_to_line_segment_v3(float r_close[3], const float p[3], const
float l1[3], const float l2[3]);
diff --git a/source/blender/blenlib/intern/math_geom.c
b/source/blender/blenlib/intern/math_geom.c
index 05a527c..92fa52a 100644
--- a/source/blender/blenlib/intern/math_geom.c
+++ b/source/blender/blenlib/intern/math_geom.c
@@ -477,6 +477,63 @@ float dist_to_line_v3(const float v1[3], const float
l1[3], const float l2[3])
return sqrtf(dist_squared_to_line_v3(v1, l1, l2));
}
+/**
+ * Check if \a p is inside the 2x planes defined by ``(v1, v2, v3)``
+ * where the 3x points define 2x planes.
+ *
+ * \param axis_fallback used when v1,v2,v3 form a line.
+ *
+ * \note the distance from \a v1 & \a v3 to \a v2 doesnt matter
+ * (it just defines the planes).
+ *
+ * \return the lowest squared distance to eithe of the planes.
+ * where ``(return < 0.0)`` is outside.
+ *
+ * <pre>
+ * v1
+ * +
+ * /
+ * x - out / x - inside
+ * /
+ * +----+
+ * v2 v3
+ * x - also outside
+ * </pre>
+ */
+float dist_signed_squared_to_corner_v3v3v3(
+ const float p[3],
+ const float v1[3], const float v2[3], const float v3[3],
+ const float axis_fallback[3])
+{
+ float dir_a[3], dir_b[3];
+ float plane_a[4], plane_b[4];
+ float axis[3];
+
+ sub_v3_v3v3(dir_a, v1, v2);
+ sub_v3_v3v3(dir_b, v3, v2);
+
+ cross_v3_v3v3(axis, dir_a, dir_b);
+
+ if ((len_squared_v3(axis) < FLT_EPSILON) && axis_fallback) {
+ copy_v3_v3(axis, axis_fallback);
+ }
+
+ cross_v3_v3v3(plane_a, axis, dir_a);
+ cross_v3_v3v3(plane_b, dir_b, axis);
+
+#if 0
+ plane_from_point_normal_v3(plane_a, center, l1);
+ plane_from_point_normal_v3(plane_b, center, l2);
+#else
+ /* do inline */
+ plane_a[3] = -dot_v3v3(plane_a, v2);
+ plane_b[3] = -dot_v3v3(plane_b, v2);
+#endif
+
+ return min_ff(dist_signed_squared_to_plane_v3(p, plane_a),
+ dist_signed_squared_to_plane_v3(p, plane_b));
+}
+
/* Adapted from "Real-Time Collision Detection" by Christer Ericson,
* published by Morgan Kaufmann Publishers, copyright 2005 Elsevier Inc.
*
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