Re: Reading Z-buffer

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Steve Baker (steve++at++mred.hti.com)
Fri, 8 Dec 95 09:23:44 -0600

> I'm trying to read the z-buffer by calling a routine at the end of perfly's
> PostDraw() routine. This routine uses the following gl code:
>
> readsource(SRC_ZBUFFER);
> lrectread(300,300,500,500,parray);
>
> This doesn't work. If I use SRC_FRONT I can easily read the front buffer.
> Is the depth buffer being cleared somewhere in Performer's Draw process?
  
Do you have multisampling enabled?

There is a GL/hardware limitation that prevents you from reading the multisample Z buffer.
Try turning the multisample buffer off.

  Steve

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