Stencilling and transparency

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Glen D. Fraser (fraser++at++portola.com)
Mon, 1 Aug 1994 11:33:57 -0700 (PDT)


I posted a question last week about transparent objects
and the use of stencil planes. I've received no comments
about it, and am still experiencing the problem.

This is the setting:

  - I am working with multiple stencil planes in a Performer 1.2
    application;
  - I have some transparent objects (objects with material alpha < 1.0)
    in the same scenes as the stencil ones;
  - I also have some objects with textures containing alpha
    components,
  - I have antialiasing turned on (using multisampling on our
    single-pipe Onyx RE2 with 2 RMs).

Whenever I use stencil planes and multisampling (using
mssize(8, 32, 8), for example), the objects with material alpha
no longer appear. However, textures with alpha components still
seem to render correctly. If I turn off stencilling, then the
transparent objects return, but, of course, my stencil stuff is
all messed up.

Should I be able to display transparent objects and make use of
one or more stencil planes at the same time? Do I need a greater
pixel depth than "medium"?

Could someone offer some suggestions? Thanks.
Glen.

===========================================================
Glen D. Fraser Head, Software and
Telepresence Research, Inc. System Development
320 Gabarda Way Phone: (415)854-4420
Portola Valley, CA 94028 Fax: (415)854-3141
USA E-Mail: fraser++at++telepresence.com
===========================================================


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