Hi,

> I have a single partially transparent (as in some parts transparent,
> some parts opaque) object that needs to cover some other transparent
> objects. Is it possible to enable zbuf-write only for that object?

not directly if you mean what is implemented currently in OpenSG. BUT, 
you could write your own Chunk which does nothing else that 
activate/deactive this OpenGL setting and add it to that material. 
There should be enough code to take a peak into. You could even 
contribute the result (if working of course) ;)

Regards

Matthias

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