trouble with transparent textures

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Edward Peters (elpeters++at++ncsa.uiuc.edu)
Mon, 24 Feb 1997 13:57:10 -0600

Howdy,

I'm using Performer 2.1 on an IR Onyx running IRIX 6.2

I'd like to map an rgba texture onto a piece of geometry, so I've added
the following calls when I build my geoset and its corresponding
geostate:

  gState->setVal(PFSTATE_ALPHAREF, 0.0);
  gState->setMode(PFSTATE_ALPHAFUNC, PFAF_EQUAL);
  gState->setMode(PFSTATE_TRANSPARENCY, PFTR_ON);

>From the Performer Programmer's guide, I'd expect areas of my texture
with alpha=0 to be transparent, but instead nothing is drawn (the whole
thing is transparent!) If I remove the above calls I get normal texture
mapping (but no transparency).

Can anyone offer suggestions? Texturing is awfully complicated, and as
verbose and readable as all the gl and performer man pages are :) I'm
coming to the end of my ability to comprehend.

Thanks in advance.

Ed Peters
elpeters++at++ncsa.uiuc.edu
(Grad. research assistant, NCSA)
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