I'm trying to clone an object in Forge Viewer. I have tried using THREE.js and creating a clone but it has different structure to the base object.

sceneBuilder = viewer.loadExtension("Autodesk.Viewing.SceneBuilder");
let modelBuilder = await sceneBuilder.addNewModel({
    conserveMemory: false,
    modelNameOverride: `Custom model`,
  });

let renderProxy = viewer.impl.getRenderProxy(viewer.model, fragId);
let geom = new THREE.Geometry();
let VE = Autodesk.Viewing.Private.VertexEnumerator;
VE.enumMeshVertices(renderProxy.geometry, (v: any, i: any) => {
    geom.vertices.push(new THREE.Vector3(v.x, v.y, v.z));
  });

  VE.enumMeshIndices(renderProxy.geometry, (a, b, c) => {
    geom.faces.push(new THREE.Face3(a, b, c));
  });
geom.computeFaceNormals();
let mesh = new THREE.Mesh(
    new THREE.BufferGeometry().fromGeometry(geom),
    renderProxy.material
  );
(mesh as any).dbId = dbId;
modelBuilder.addMesh(mesh);

I found that renderProxy is also THREE.Mesh, but when I tried let clone = renderProxy.clone(); modelBuilder.addMesh(clone), it doesn't work. Anyway to clone an object in Viewer?

Another thing, when I add a mesh by modelBuilder, I see that the created Object has added to Browser tree, but I still can't use Viewer functions with it (such as Viewer.select(dbId); Viewer.fitToView();)