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- Newsgroups: comp.sys.sgi
- Path: sparky!uunet!spool.mu.edu!agate!ames!sgi!fido!zola!perturb!peterb
- From: peterb@perturb.esd.sgi.com (Peter Birch)
- Subject: Re: Indigo XS24 Sphere library z-buffering problems
- Message-ID: <tmkqt9g@zola.esd.sgi.com>
- Sender: news@zola.esd.sgi.com (Net News)
- Organization: Silicon Graphics, Inc. Mountain View, CA
- References: <34677@adm.brl.mil>
- Date: Thu, 17 Dec 92 02:04:42 GMT
- Lines: 25
-
-
- In article <34677@adm.brl.mil>, SML108@psuvm.psu.edu writes:
- > Hi, a program I am developing which uses the sphere library runs just
- > fine on an IRIS 4D/220 VGS, but when I run it on a nearby Indigo XS24,
- > the SPH_HEMI seems to get set true by default with SPH_ORIENT set to
- > FALSE (It draws hemispheres which show up as you rotate objects on
- > the screen). If I set SPH_HEMI and SPH_ORIENT to TRUE, this problem
- > goes away, but then z-buffering goes away too and the appearance of
- > spheres on the screen is as if they all have the same z-coordinate
- > and appear in the order in which they are drawn... The Indigo is
- > running 4.0.5 and zbuffer is most definitely set to TRUE...
- >
- > Oh, one more thing, this is in a GLX widget that this is happening...
- >
- > Scott Le Grand
-
- If this is an XS24 without a hardware z-buffer, then z-buffering is not
- supported, independent of whether there is a zbuffer(TRUE) statement or not.
- XS does not support a software z-buffer, unlike the Entry graphics
- system.
-
- peter
-
- .....Peter Birch.....peterb@perturb.esd.sgi.com.....MTS, Graphics Hardware.....
- ......Silicon Graphics, Inc.....Mountain View, CA 94039.....(415)390-1512......
-