There is an error on threejs release 141, “Object3d().add is undefined”.
Maybe like this:
mesh_1=new THREE.Object3D; mesh_1.add(mesh_2);
I have the same error “THREE.Object3D.add: object not an instance of THREE.Object3D. undefined” as soon as I replace the three.module.js release 140 with release 141 the error occurred.
Can you show us your code so others can see where how the error occurs?
The error occurred with code
glft.scene I fixed it with
here is the source code