Sorry, I started to diverge and just suggest improvements to BJS instead of comparing it. But googling returned this, which though a 3rd party extension is exactly what I’d like to have as an user: GitHub - pailhead/three-instanced-mesh: wrapper around THREE.InstancedBufferGeometry
I don’t know. It ended up being part of the demo that became part of the RTT/multipass howto after that long thread. I understood it was necessary and I vaguely recall that there was some trouble with the rendering in the RTT if the original object was used. If this is not necessary let me know and I’ll fix the demo and docs.