add createGeometry

lib/filament_controller.dart

@@ -545,4 +545,10 @@ abstract class FilamentController {
   /// If there is a collision between the controlled entity and [collidableEntity], the transform will not be updated.
   ///
   Future addCollisionComponent(FilamentEntity collidableEntity);
+
+  ///
+  /// Creates a (renderable) entity with the specified geometry and adds to the scene.
+  ///
+  Future createGeometry(
+      List<double> vertices, List<int> indices, String? materialPath);
 }