Re: (originally no subject) Texturing modes

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Angus Dorbie (dorbie++at++sgi.com)
Tue, 09 Jun 1998 13:23:07 -0700

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Angus Dorbie wrote:
>
> Prakash Mahesh wrote:
> >
> > Hello all,
> > I want to pose my previous question a different way, more
> > proactive then reactive. How would one utilize a 4 channel texture
> > (RGBA) so that the texture would appear on a surface as in decal mode,
> > but would be transparent as a function of its alpha channel? This
> > would allow a cookie-cutter decal based on the alpha channel (binary
> > with one designating stuff and 0 designating lack of stuff).
> >
>
> But that's the same question :-)
>
> If you need decal placement ie blend with polygon color (or lighting
> result) as a function of alpha _and_ decal then it can't be done in a
> single pass today.

Doh! Let me try again.

If you need decal blend with polygon color (or lighting
result) as a function of alpha _and_ alpha modulation of
source fragment alpha then it can't be done in a single
pass today.

>
> I was hoping for a higher level objective not descriptive algorithmic.
>
> Cheers,Angus.
>
> --
> "Only the mediocre are always at their best." -- Jean Giraudoux
>
> For advanced 3D graphics Performer + OpenGL based examples and tutors:
> http://www.dorbie.com/
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-- 
"Only the mediocre are always at their best." -- Jean Giraudoux 

For advanced 3D graphics Performer + OpenGL based examples and tutors:
http://www.dorbie.com/
=======================================================================
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Next message: Prakash Mahesh: "Re: (originally no subject) Texturing modes"
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