static [UDynamicMesh](API\Runtime\GeometryFramework\UDynamicMesh) * DeleteTrianglesByMaterialID ( [UDynamicMesh](API\Runtime\GeometryFramework\UDynamicMesh) * TargetMesh, int MaterialID, int & NumDeleted, bool bDeferChangeNotifications, [UGeometryScriptDebug](API\Plugins\GeometryScriptingCore\GeometryScript\UGeometryScriptDebug) * Debug )