Re: Z-Buffer Problem

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Allan Schaffer (aschaffe)
Mon, 16 Sep 1996 11:21:25 -0700

On Sep 13, 4:31pm, Allan Schaffer wrote:
>
> Are you using a multisample visual? If so, it won't work --
> glReadPixels can only read the 'regular' Z buffer. It's not possible
> to read the multisample Z buffer (either on RE or IR).

Correction -- it is possible on IR systems, but not on RE.

On IR, the returned value for each pixel is the Z at the sample
closest to the center of the pixel. You can't read the Zs for any of
the other samples, however.

Thanks to Angus Dorbie & Allen Akin for pointing this out.

Allan

-- 
Allan Schaffer                                             aschaffe++at++sgi.com
Silicon Graphics                            http://reality.sgi.com/aschaffe
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