Re: Evironment mapping for patchy reflections below the lightpoints !!!!

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Angus Dorbie (dorbie++at++bitch.reading.sgi.com)
Fri, 31 Jan 1997 18:52:15 +0000

I should point out that for this blend function alpha is meaningless,
you should have accurate light colour fading to black on the outside of
the polygon.

Cheers,
Angus.

> Subject: Re: Evironment mapping for patchy reflections below the lightpoin
> Angus Dorbie wrote:

> > If you want really excellent patchy light sources then you could
> > try writing hidden alpha patches (alpha = wetness) to the destination
> > alpha over the runway surface.
> >
> > Duplicate the geometry of the lights, but reflected through
> > the plane of the runway.
> >
> > You can then change the geometry of the reflected lights to be
representative
> > of the reflection for the surface roughness.
> >
> > Disable the depth test.
> >
> > Enable blended pfTransparency.
> >
> > Draw the reflected lights with a blendfunction of GL_DST_ALPHA, GL_ONE.
> >

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