From cb9dfd5d28d52f774f1cef9e44927d43e31b2910 Mon Sep 17 00:00:00 2001
From: Juan Linietsky <reduzio@gmail.com>
Date: Sun, 10 Jan 2016 17:25:20 -0300
Subject: [PATCH] avoid crash with empty concavepolygonshape, fixes #3169

---
 servers/physics/shape_sw.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/servers/physics/shape_sw.cpp b/servers/physics/shape_sw.cpp
index d289510cb64..5923f891203 100644
--- a/servers/physics/shape_sw.cpp
+++ b/servers/physics/shape_sw.cpp
@@ -1354,6 +1354,10 @@ void ConcavePolygonShapeSW::_fill_bvh(_VolumeSW_BVH* p_bvh_tree,BVH* p_bvh_array
 void ConcavePolygonShapeSW::_setup(DVector<Vector3> p_faces) {
 
 	int src_face_count=p_faces.size();
+	if (src_face_count==0) {
+		configure(AABB());
+		return;
+	}
 	ERR_FAIL_COND(src_face_count%3);
 	src_face_count/=3;