Glow effect

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From: c937161++at++student.dtu.dk
Date: 03/24/2000 02:10:26

Hey Performers,

After some struggling with transparency I'm almost done with this cool
glow effect for lights. It's a billboard and to prevent it from being
occluded when it's partially covered by another object I use the following
callbacks:

static int preDraw( pfTraverser *trav, void *data )
{
        glDisable( GL_DEPTH_TEST );
        return PFTRAV_CONT;
}

static int preDraw( pfTraverser *trav, void *data )
{
        glDisable( GL_DEPTH_TEST );
        return PFTRAV_CONT;
}

The problem is that this ofcause makes it visible at all times. It should
be turned off when the center of the light is covered. How do I do
that? In pure OpenGL I'd probably use the feedback buffer somehow.

I'm using Performer 2.3 for Linux.

Btw. thanks to SGI for porting Performer to Linux - it really, really
rocks big-time :-) 

--
Hans Palbøl

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