[info-performer] Projective light quirks

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From: Frank R. Hartman (frank.hartman++at++jpl.nasa.gov)
Date: 10/16/2002 13:05:08

pfGreetings,

I have been experimenting with projective pfLightSources and I noticed a
few odd behaviors:

First there seems to be some light "leaking" so that some lighting is
taking place at around 90 degrees off the lights spot direction. I have
a large black border around my projected texture because I thought that
the texture clamping might be to blame somehow but it did not help.

Second I notice a second porjected texture exactly 180 degrees from the
spot direction. I am not quite sure but it seems that this light
affects polys which are facing the opposite direction. I would guess it
has something to do with the lights pfFrustum(?).

I have been able to observe these artifacts under Linux and Irix by
simple modifications to the pfDCSes in the projective.C sample program.
 Has anybody else seen this or have any info about what I am doing wrong?

Thanks for any help,

Frank Hartman
NASA/JPL
Mars Exploration Rover Project

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