[Q] setting traversal mode with PFCULL_VIEW and transparency

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Sungwoo Kim (ksw++at++mbc.co.kr)
Tue, 28 Oct 1997 09:46:46 -0800


Dear performers,

A week ago, I asked about transparency problem when I modifed
motif.C sample program. I did not get any reply and guess my question
was not clear enough to answer. Since then I narrowed the source
of problem, and here I am asking again.

The problem is when I modified motif.C to include my application,
transparency did not work. Actually, it worked between faces
under the same gset, but not between different gsets.

I tracked the problem to the line

        Shared->chan->setTravMode( PFTRAV_CULL,
                                   PFCULL_VIEW | PFCULL_GSET );

If PFCULL_VIEW is set, transparency did not work, but when it is
removed, transparency worked find.

Is this a bug, or transparency is supposed to work only between
faces in the same gset. Although I turned of PFCULL_VIEW,
man page says setting PFCULL_VIEW will give better performance.
Is there any way both setting PFCULL_VIEW and making transparency
working?

Thanks for any info.

Byungsung Cho
rtv++at++bbs.para.co.kr
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