Math Lib: clamp closest_to_line_segment_v# when segment has no length

For a line this makes sense but segments should clamp,
avoids assert in edge-rip.

1 files changed, 14 insertions, 6 deletions

diff --git a/source/blender/blenlib/intern/math_geom.c b/source/blender/blenlib/intern/math_geom.c
index 25d40bc3f5e..7ce602238d3 100644
--- a/source/blender/blenlib/intern/math_geom.c
+++ b/source/blender/blenlib/intern/math_geom.c
@@ -341,12 +341,16 @@ void closest_to_line_segment_v2(float r_close[2], const float p[2], const float
 
 	lambda = closest_to_line_v2(cp, p, l1, l2);
 
-	if (lambda <= 0.0f)
+	/* flip checks for !finite case (when segment is a point) */
+	if (!(lambda > 0.0f)) {
 		copy_v2_v2(r_close, l1);
-	else if (lambda >= 1.0f)
+	}
+	else if (!(lambda < 1.0f)) {
 		copy_v2_v2(r_close, l2);
-	else
+	}
+	else {
 		copy_v2_v2(r_close, cp);
+	}
 }
 
 /* point closest to v1 on line v2-v3 in 3D */
@@ -356,12 +360,16 @@ void closest_to_line_segment_v3(float r_close[3], const float p[3], const float
 
 	lambda = closest_to_line_v3(cp, p, l1, l2);
 
-	if (lambda <= 0.0f)
+	/* flip checks for !finite case (when segment is a point) */
+	if (!(lambda > 0.0f)) {
 		copy_v3_v3(r_close, l1);
-	else if (lambda >= 1.0f)
+	}
+	else if (!(lambda < 1.0f)) {
 		copy_v3_v3(r_close, l2);
-	else
+	}
+	else {
 		copy_v3_v3(r_close, cp);
+	}
 }
 
 /**