Transparency and Lighting? Don't work together?

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Rodney Hoinkes (rhoinkes++at++imm-studios.com)
Tue, 05 Aug 1997 20:48:50 -0400

Hello all,

We are having a problem that it is likely others have as well and are
seeking advice from the wise.

We have a custom pf loader for our data. Some nodes within it are solid
(no alpha) and some are alpha'd. When I setup the modes with
pfdBldrStateMode and turn PFSTATE_TRANSPARENCY ON, the objects only show
transparency when the 'sun' is OFF (not EYE or SUN in perfly).

Now I can live without lighting (if I must) on alpha'd objects so I also
added PFSTATE_ENLIGHTING to OFF on transparent nodes. This generally
works except that I occasionally get lighting flashes across the model
while fly around it (lighting on the whole model - or big parts of it
turn on or off briefly). These flashes are unacceptable as are solid
nodes that should be alpha.

Someone else MUST have encountered this situation before. Advice would
be helpful as our deadline approaches for public display and my heart is
beatting faster. Any thoughts/suggestions/solutions?

PS. Running Perf 2.2 beta on Onyx2 IR 6.4.1 IRIX.

Rodney Hoinkes
Immersion Studios Inc.
e rhoinkes++at++imm-studios.com
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