Rendering one scene on to another

How (if) can i render a stack of scenes one on the other? Having multiple viewports covering entire screen turns out does not do this at all. I think clearing z buffer is needed after each scene is rendered too.

Has been discussed a few times on the forum already. Indeed, use another viewport, and a customized renderpath that only clears depth but not color.

One such thread with code: topic1749.html

Ah, here’s the one I remember:

How to Layer Scenes
topic756.html

thank you

did just that