2 files changed, 36 insertions, 7 deletions

diff --git a/scene/resources/concave_polygon_shape_3d.cpp b/scene/resources/concave_polygon_shape_3d.cpp
index f067695d7d..3fed700383 100644
--- a/scene/resources/concave_polygon_shape_3d.cpp
+++ b/scene/resources/concave_polygon_shape_3d.cpp
@@ -35,13 +35,12 @@
 Vector<Vector3> ConcavePolygonShape3D::get_debug_mesh_lines() const {
 	Set<DrawEdge> edges;
 
-	Vector<Vector3> data = get_faces();
-	int datalen = data.size();
-	ERR_FAIL_COND_V((datalen % 3) != 0, Vector<Vector3>());
+	int index_count = faces.size();
+	ERR_FAIL_COND_V((index_count % 3) != 0, Vector<Vector3>());
 
-	const Vector3 *r = data.ptr();
+	const Vector3 *r = faces.ptr();
 
-	for (int i = 0; i < datalen; i += 3) {
+	for (int i = 0; i < index_count; i += 3) {
 		for (int j = 0; j < 3; j++) {
 			DrawEdge de(r[i + j], r[i + ((j + 1) % 3)]);
 			edges.insert(de);
@@ -71,22 +70,46 @@ real_t ConcavePolygonShape3D::get_enclosing_radius() const {
 }
 
 void ConcavePolygonShape3D::_update_shape() {
+	Dictionary d;
+	d["faces"] = faces;
+	d["backface_collision"] = backface_collision;
+	PhysicsServer3D::get_singleton()->shape_set_data(get_shape(), d);
+
 	Shape3D::_update_shape();
 }
 
 void ConcavePolygonShape3D::set_faces(const Vector<Vector3> &p_faces) {
-	PhysicsServer3D::get_singleton()->shape_set_data(get_shape(), p_faces);
+	faces = p_faces;
+	_update_shape();
 	notify_change_to_owners();
 }
 
 Vector<Vector3> ConcavePolygonShape3D::get_faces() const {
-	return PhysicsServer3D::get_singleton()->shape_get_data(get_shape());
+	return faces;
+}
+
+void ConcavePolygonShape3D::set_backface_collision_enabled(bool p_enabled) {
+	backface_collision = p_enabled;
+
+	if (!faces.is_empty()) {
+		_update_shape();
+		notify_change_to_owners();
+	}
+}
+
+bool ConcavePolygonShape3D::is_backface_collision_enabled() const {
+	return backface_collision;
 }
 
 void ConcavePolygonShape3D::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_faces", "faces"), &ConcavePolygonShape3D::set_faces);
 	ClassDB::bind_method(D_METHOD("get_faces"), &ConcavePolygonShape3D::get_faces);
+
+	ClassDB::bind_method(D_METHOD("set_backface_collision_enabled", "enabled"), &ConcavePolygonShape3D::set_backface_collision_enabled);
+	ClassDB::bind_method(D_METHOD("is_backface_collision_enabled"), &ConcavePolygonShape3D::is_backface_collision_enabled);
+
 	ADD_PROPERTY(PropertyInfo(Variant::PACKED_VECTOR3_ARRAY, "data", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NOEDITOR | PROPERTY_USAGE_INTERNAL), "set_faces", "get_faces");
+	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "backface_collision"), "set_backface_collision_enabled", "is_backface_collision_enabled");
 }
 
 ConcavePolygonShape3D::ConcavePolygonShape3D() :
diff --git a/scene/resources/concave_polygon_shape_3d.h b/scene/resources/concave_polygon_shape_3d.h
index 391459a3d7..bb28359dcc 100644
--- a/scene/resources/concave_polygon_shape_3d.h
+++ b/scene/resources/concave_polygon_shape_3d.h
@@ -36,6 +36,9 @@
 class ConcavePolygonShape3D : public Shape3D {
 	GDCLASS(ConcavePolygonShape3D, Shape3D);
 
+	Vector<Vector3> faces;
+	bool backface_collision = false;
+
 	struct DrawEdge {
 		Vector3 a;
 		Vector3 b;
@@ -65,6 +68,9 @@ public:
 	void set_faces(const Vector<Vector3> &p_faces);
 	Vector<Vector3> get_faces() const;
 
+	void set_backface_collision_enabled(bool p_enabled);
+	bool is_backface_collision_enabled() const;
+
 	virtual Vector<Vector3> get_debug_mesh_lines() const override;
 	virtual real_t get_enclosing_radius() const override;