Re: >Flashing on and off of

New Message Reply Date view Thread view Subject view Author view

Marcus (Marcus++at++multigenuunet.uu.net)
Mon, 25 Apr 1994 17:40:44 PST

        Reply to: RE>>Flashing on and off of c
>Hi
>
>I had a posting a few days ago about texture flashing on and
>off. I have since investigated this further, and found out
>that it isn't texture, but in fact appears to be the ambient
>colour for some of the polygons either saturating at peak white
>or peak black.

<stuff deleted>

>Thanks for your time
>Richard Gallery

I have seen similarly "flashing" geometry. It happens on machines without
hardware z-buffer, when there is co-planer geometry in the data base. On an
Indigo XS24 with 4 stencil planes and no z-buffer for instance.

I suspect that Performer requires a z-buffer (and stencil planes) in order
to render co-planer geometry correctly, although the Performer 1.0 manual
page for pfLayer says that only a "hardware stencil buffer" is required.
The visual results imply [ ... quick check of the stencil(3g) manual page]
that the FAIL and ZPASS cases are handled correctly by Performer, but
perhaps not the PASS case? (Corrections welcome ;-)

Note also the multi-sampling configurations can alter the *apparent*
existance of both stencil and z buffers.

Regards,
Mark Barnes
Member Technical Staff
multigen!marcus++at++uunet.UU.NET
MultiGen Inc.
(408) 247 4326

New Message Reply Date view Thread view Subject view Author view

This archive was generated by hypermail 2.0b2 on Mon Aug 10 1998 - 17:50:15 PDT

This message has been cleansed for anti-spam protection. Replace '++at++' in any mail addresses with the '@' symbol.