Fix #32031: particle distribution on degenerate faces could give NaN values,

which in this case caused NaN values in render lighting.

1 files changed, 2 insertions, 2 deletions

diff --git a/source/blender/blenlib/intern/math_geom.c b/source/blender/blenlib/intern/math_geom.c
index 76f4f26b728..53e9a6b66cb 100644
--- a/source/blender/blenlib/intern/math_geom.c
+++ b/source/blender/blenlib/intern/math_geom.c
@@ -2229,7 +2229,7 @@ void interp_weights_poly_v3(float *w, float v[][3], const int n, const float co[
 		t2 = mean_value_half_tan_v3(co, vmid, vnext);
 
 		len = len_v3v3(co, vmid);
-		w[i] = (t1 + t2) / len;
+		w[i] = (len != 0.0f)? (t1 + t2) / len: 0.0f;
 		totweight += w[i];
 	}
 
@@ -2257,7 +2257,7 @@ void interp_weights_poly_v2(float *w, float v[][2], const int n, const float co[
 		t2 = mean_value_half_tan_v2(co, vmid, vnext);
 
 		len = len_v2v2(co, vmid);
-		w[i] = (t1 + t2) / len;
+		w[i] = (len != 0.0f)? (t1 + t2) / len: 0.0f;
 		totweight += w[i];
 	}