render same Object3D in multiple worlds?

[MichaelJPCT]

the doc says Object3d should be added to 1 world only.
i wonder if an Object3d is added to 2 worlds and render them, what will happen, - only for rendering purpose.
1 of the World is used for shadow.
because the Object3d should be isolated in shadow World by my design, so i have to use another World, or i must call setVisibility many times.

[MichaelJPCT]

never mind this. i would use multiple Object3D with the same Mesh for my purpose.

[EgonOlsen]

Yes, that's how to do it. The objects can share some data though, but you have to use different instances for multiple worlds.