Intersection Test Problems

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Torsten Moeller (tmoeller++at++cgrg.ohio-state.edu)
Fri, 26 Jan 1996 15:56:10 -0500

I experience problems doing intersection tests.
I am walking around in a (virtual) building and am trying
to always find the distance to the walls ahead.
I took the xformer.c/collide.c library functions and modified them
a little so I have an intersection segment of length 255.
Most of the walls are working fine, but for some it seems
I am getting the distance to walls behind the nearest one.
I was then trying to play with the flags passed to the procedure
pfuSegsIsectNode/pfSegsIsectGSet. The problem remains even if I
do not set nor PFTRAV_IS_CULL_FRONT.

I was also trying to use the function 'discFunc' to obtain
information about the current intersection point, but it
doesn't seem like this function is called at all.

Is anybody aware of a bug in the Intersection routine?
I am using Performer 1.2 on IRIX 5.3.

Thanks for any feedback,

                                        Torsten.

--
Research Assistant   			ACCAD
tmoeller++at++cgrg.ohio-state.edu		Ohio State University

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