Add clear() function to NavigationMesh / NavigationPolygon

Adds clear() function to NavigationMesh / NavigationPolygon.

doc/classes/NavigationMesh.xml

@@ -18,6 +18,12 @@
 				Adds a polygon using the indices of the vertices you get when calling [method get_vertices].
 			</description>
 		</method>
+		<method name="clear">
+			<return type="void" />
+			<description>
+				Clears the internal arrays for vertices and polygon indices.
+			</description>
+		</method>
 		<method name="clear_polygons">
 			<return type="void" />
 			<description>

doc/classes/NavigationPolygon.xml

@@ -69,6 +69,12 @@
 				Adds a polygon using the indices of the vertices you get when calling [method get_vertices].
 			</description>
 		</method>
+		<method name="clear">
+			<return type="void" />
+			<description>
+				Clears the internal arrays for vertices and polygon indices.
+			</description>
+		</method>
 		<method name="clear_outlines">
 			<return type="void" />
 			<description>

scene/resources/navigation_mesh.cpp

@@ -341,6 +341,11 @@ void NavigationMesh::clear_polygons() {
 	polygons.clear();
 }
 
+void NavigationMesh::clear() {
+	polygons.clear();
+	vertices.clear();
+}
+
 #ifdef DEBUG_ENABLED
 Ref<ArrayMesh> NavigationMesh::get_debug_mesh() {
 	if (debug_mesh.is_valid()) {
@@ -518,6 +523,8 @@ void NavigationMesh::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("_set_polygons", "polygons"), &NavigationMesh::_set_polygons);
 	ClassDB::bind_method(D_METHOD("_get_polygons"), &NavigationMesh::_get_polygons);
 
+	ClassDB::bind_method(D_METHOD("clear"), &NavigationMesh::clear);
+
 	ADD_PROPERTY(PropertyInfo(Variant::PACKED_VECTOR3_ARRAY, "vertices", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR | PROPERTY_USAGE_INTERNAL), "set_vertices", "get_vertices");
 	ADD_PROPERTY(PropertyInfo(Variant::ARRAY, "polygons", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR | PROPERTY_USAGE_INTERNAL), "_set_polygons", "_get_polygons");
 

scene/resources/navigation_mesh.h

@@ -202,6 +202,8 @@ public:
 	Vector<int> get_polygon(int p_idx);
 	void clear_polygons();
 
+	void clear();
+
 #ifdef DEBUG_ENABLED
 	Ref<ArrayMesh> get_debug_mesh();
 #endif // DEBUG_ENABLED

scene/resources/navigation_polygon.cpp

@@ -162,6 +162,15 @@ void NavigationPolygon::clear_polygons() {
 	}
 }
 
+void NavigationPolygon::clear() {
+	polygons.clear();
+	vertices.clear();
+	{
+		MutexLock lock(navigation_mesh_generation);
+		navigation_mesh.unref();
+	}
+}
+
 Ref<NavigationMesh> NavigationPolygon::get_navigation_mesh() {
 	MutexLock lock(navigation_mesh_generation);
 
@@ -360,6 +369,8 @@ void NavigationPolygon::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_cell_size", "cell_size"), &NavigationPolygon::set_cell_size);
 	ClassDB::bind_method(D_METHOD("get_cell_size"), &NavigationPolygon::get_cell_size);
 
+	ClassDB::bind_method(D_METHOD("clear"), &NavigationPolygon::clear);
+
 	ADD_PROPERTY(PropertyInfo(Variant::PACKED_VECTOR2_ARRAY, "vertices", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR | PROPERTY_USAGE_INTERNAL), "set_vertices", "get_vertices");
 	ADD_PROPERTY(PropertyInfo(Variant::ARRAY, "polygons", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR | PROPERTY_USAGE_INTERNAL), "_set_polygons", "_get_polygons");
 	ADD_PROPERTY(PropertyInfo(Variant::ARRAY, "outlines", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR | PROPERTY_USAGE_INTERNAL), "_set_outlines", "_get_outlines");

scene/resources/navigation_polygon.h

@@ -92,6 +92,8 @@ public:
 	void set_cell_size(real_t p_cell_size);
 	real_t get_cell_size() const;
 
+	void clear();
+
 	NavigationPolygon() {}
 	~NavigationPolygon() {}
 };