Clone gltf object in three js scene.

[Tunan]

Hello everyone,I've search for two days for ways to clone a gltf object but no one works. I've trired deep clone the object, but no thing works. It seems like the object only be added once to the glTF render list when it be loaded. The clone body can't be render in screen.
Here is the result of scene.add（obj.clone()）;
`var gltfLoader = new THREE.GLTFLoader();
            gltfLoader.load('assets/model/gltf/tree/tree.gltf', function ( data ) {
                var gltf = data;
                var gltfobj = gltf.scene !== undefined ? gltf.scene : gltf.scenes[ 0 ];
                gltfobj.position.z += 5;
                gltfobj.name = "tree";
                scene.add(gltfobj);

                var tree2 = gltfobj.clone();
                tree2.position.x+=1;
                scene.add( tree2 );
            });
`

The cloned object only show shadow in the scene.

I've test the colladaLoader and the daeobject is working well, so now I don't know what is going wrong.So,what should I do to clone it in three js scene?

If anybody can help me?Thanks!

[donmccurdy]

This is a known bug with THREE.GLTFLoader: https://github.com/mrdoob/three.js/issues/8869

If you could add a comment to the GitHub issue there, giving these same details and including your model if possible, that would help us to debug this. Thanks!

[Tunan]

Well, It seems like this problem is still no solution.I'm testing the other format to see if they can replace the .gltf in actual use. Thank you! @donmccurdy