Developers can Add, retrieve, and remove custom properties of 3D objects. RemoveProperty, GetProperty, SetProperty members of 3D objects are a set of short-handed methods to manipulate customized properties of the object....gltf" , new GLTFSaveOptions ( FileFormat . GLTF ){ SaveExtras...true }); scene . Save ( "test-2.gltf" , new GLTFSaveOptions ( FileFormat...