Ported the improvements to the NavigationMesh from the NavigationMeshGenerator rework pr.

scene/resources/navigation_mesh.cpp

@@ -70,6 +70,8 @@ void NavigationMesh::create_from_mesh(const Ref<Mesh> &p_mesh) {
 			add_polygon(vi);
 		}
 	}
+
+	navigation_mesh_dirty = true;
 }
 
 void NavigationMesh::set_sample_partition_type(SamplePartitionType p_value) {
@@ -321,7 +323,7 @@ Array NavigationMesh::_get_polygons() const {
 
 void NavigationMesh::add_polygon(const Vector<int> &p_polygon) {
 	polygons.push_back(p_polygon);
-	_change_notify();
+	navigation_mesh_dirty = true;
 }
 int NavigationMesh::get_polygon_count() const {
 	return polygons.size();
@@ -332,6 +334,52 @@ Vector<int> NavigationMesh::get_polygon(int p_idx) {
 }
 void NavigationMesh::clear_polygons() {
 	polygons.clear();
+	navigation_mesh_dirty = true;
+}
+
+void NavigationMesh::clear() {
+	polygons.clear();
+	vertices.clear();
+	navigation_mesh_dirty = true;
+}
+void NavigationMesh::commit_changes() {
+	// Function to synchronize the navigation mesh with the NavigationServer
+	// Placeholder function that gets fleshed out with PR 'Add NavigationServer Navmesh and NavMesh Instances'
+	// Function was already added so users and tutorials and documentation only have to adapt once to the procedural workflow changes
+	if (navigation_mesh_dirty) {
+		navigation_mesh_dirty = false;
+		/*
+		Vector<Vector3> new_navmesh_vertices;
+		Vector<Vector<int32_t>> new_navmesh_polygons;
+		new_navmesh_vertices.resize(vertices.size());
+		new_navmesh_polygons.resize(polygons.size());
+		Vector3 *new_navmesh_vertices_ptrw = new_navmesh_vertices.ptrw();
+		Vector<int32_t> *new_navmesh_polygons_ptrw = new_navmesh_polygons.ptrw();
+		for (int i = 0; i < vertices.size(); i++) {
+			new_navmesh_vertices_ptrw[i] = vertices[i];
+		}
+		for (int i = 0; i < polygons.size(); i++) {
+			new_navmesh_polygons_ptrw[i] = polygons[i];
+		}
+		NavigationServer3D::get_singleton()->navmesh_set_data(navmesh_rid, new_navmesh_vertices, new_navmesh_polygons);
+		*/
+		emit_changed();
+	}
+}
+
+void NavigationMesh::set_polygons(const Vector<Vector<int>> &p_polygons) {
+	polygons = p_polygons;
+	navigation_mesh_dirty = true;
+}
+const Vector<Vector<int>> &NavigationMesh::get_polygons() const {
+	return polygons;
+}
+
+RID NavigationMesh::get_rid() const {
+	if (navmesh_rid.is_valid()) {
+		return navmesh_rid;
+	}
+	return RID();
 }
 
 #ifdef DEBUG_ENABLED
@@ -510,6 +558,9 @@ void NavigationMesh::_bind_methods() {
 
 	ClassDB::bind_method(D_METHOD("create_from_mesh", "mesh"), &NavigationMesh::create_from_mesh);
 
+	ClassDB::bind_method(D_METHOD("clear"), &NavigationMesh::clear);
+	ClassDB::bind_method(D_METHOD("commit_changes"), &NavigationMesh::commit_changes);
+
 	ClassDB::bind_method(D_METHOD("_set_polygons", "polygons"), &NavigationMesh::_set_polygons);
 	ClassDB::bind_method(D_METHOD("_get_polygons"), &NavigationMesh::_get_polygons);
 
@@ -612,4 +663,14 @@ NavigationMesh::NavigationMesh() {
 	filter_low_hanging_obstacles = false;
 	filter_ledge_spans = false;
 	filter_walkable_low_height_spans = false;
+
+	navigation_mesh_dirty = true;
+
+	//navmesh_rid = NavigationServer3D::get_singleton()->navmesh_create();
+	call_deferred("commit_changes");
 }
+
+NavigationMesh::~NavigationMesh() {
+	//ERR_FAIL_NULL(NavigationServer::get_singleton());
+	//NavigationServer::get_singleton()->free(navmesh_rid);
+}

scene/resources/navigation_mesh.h

@@ -40,10 +40,16 @@ class NavigationMesh : public Resource {
 
 	friend class NavigationMeshGenerator;
 
+	RID navmesh_rid;
+
 	PoolVector<Vector3> vertices;
+
 	Vector<Vector<int>> polygons;
+
 	Ref<ArrayMesh> debug_mesh;
 
+	bool navigation_mesh_dirty;
+
 protected:
 	static void _bind_methods();
 	virtual void _validate_property(PropertyInfo &property) const;
@@ -185,11 +191,20 @@ public:
 	Vector<int> get_polygon(int p_idx);
 	void clear_polygons();
 
+	void clear();
+	void commit_changes();
+
+	void set_polygons(const Vector<Vector<int>> &p_polygons);
+	const Vector<Vector<int>> &get_polygons() const;
+
+	RID get_rid() const;
+
 #ifdef DEBUG_ENABLED
 	Ref<ArrayMesh> get_debug_mesh();
 #endif
 
 	NavigationMesh();
+	~NavigationMesh();
 };
 
 VARIANT_ENUM_CAST(NavigationMesh::SamplePartitionType);

scene/resources/navigation_polygon.cpp

@@ -37,6 +37,7 @@
 #include "scene/resources/navigation_mesh.h"
 #include "scene/resources/world_2d.h"
 #include "servers/navigation_2d_server.h"
+#include "core/core_string_names.h"
 
 #include "thirdparty/misc/triangulator.h"
 
@@ -232,14 +233,11 @@ void NavigationPolygon::commit_changes() {
 		for (int i = 0; i < get_polygon_count(); i++) {
 			Vector<int> new_navigation_mesh_polygon = get_polygon(i);
 			new_navigation_mesh_polygons.push_back(new_navigation_mesh_polygon);
-			//OLD, remove:
-			navigation_mesh->add_polygon(get_polygon(i));
 		}
 
 		navigation_mesh->set_vertices(new_navigation_mesh_vertices);
-		// New, enable:
-		//navigation_mesh->set_polygons(new_navigation_mesh_polygons);
-		//navigation_mesh->commit_changes();
+		navigation_mesh->set_polygons(new_navigation_mesh_polygons);
+		navigation_mesh->commit_changes();
 
 		emit_changed();
 	}