Steve Baker (sbaker++at++link.com)
Mon, 14 Sep 1998 10:48:43 -0500 (CDT)
> In an application I've been writing I have a pfGeode (pfdNewCone) that I
> apply a transparent material to, everthing looks great on a Onyx, RE2,
> running IRIX 6.2 performer 2.1, but on other machines (O2, indigo, onyx...)
> running irix 6.5 performer 2.2.2 the cone loses its transparency when viewed
> from one side. In an effort to solve this problem I tried loading a
> transparent cone created in MultiGen into my scenegraph but get the same
> results...
Without seeing exactly what you are seeing, I can't be sure - but I'm 99%
certain that this is a multi-sample-alpha versus blend-alpha problem.
On RE2 and Inf.Reality you'll get multi-sample alpha by default - on
all other platforms you'll get blended alpha.
The latter suffers from the problem that if it the polygons aren't depth-sorted
then they won't Z-buffer nicely.
The former suffers from the problem that you need a multisample frame buffer
and the O2 and Indigo don't have that. Also, you only get a handful of levels
of transparency so you sometimes see some contouring artifacts.
Steve Baker (817)619-2657 (Vox/Vox-Mail)
Raytheon Systems Inc. (817)619-4028 (Fax)
Work: SBaker++at++link.com http://www.hti.com
Home: SJBaker1++at++airmail.net http://web2.airmail.net/sjbaker1
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