Hi Joachim,

> > and will the drawed geometry (shape2) clipped against the other or are
they
> > in two different universes and non-influences each other ?

> Nope if you want that also (I think you mean with clipping in this
> context occlusion, right?) you  have to grap even deeper in to
> the trick box.
> You have to draw all objects into the offScreenCanvas to get ZBuffer
> information but first you check if they have a transparencyAttribute
> if no set one with BLEND_ZERO, BLEND_ZERO as Source and Destination
> Blending. This makes sure they are rendered but don't show up on the
> canvas. So you will get black areas. I don't know if that is the effect
> you want.

well,
this is the desired effect and excactly the answer I was looking for..
but I hoped it would be possible without drawing each geometry (rendered
into the onScreenCanvas) twice.
( I guess there is no way to retrieve the ZBuffer of the OnScreenCanvas and
copy it into the other, with the same effect ?)

greetings
 -Michael Nischt

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