Angus Dorbie (dorbie++at++bitch.reading.sgi.com)
Fri, 14 Mar 1997 13:20:49 +0000
Using projective texture in a textured scene requires a multipass
approach as you are aware. This is because you can only bind one texture
at a time in OpenGL. However there is no restriction on the number
of passes and number of projective textures one might apply in a scene.
It would be trickier to get the spotlights to apply the appropriate
brightness when overlapping and not, perhaps requiring destination alpha
in some situations.
There may be problems with multiple projective textures in a particular
application or library such as performer but it has little to do with
any hardware limitations.
Cheers,Angus
On Mar 13, 9:37am, Rambabu Munjuluri wrote:
> Subject: Re: multiple projective textures?
> Daniel E. Small wrote:
> >
> > Hello Performers,
> >
> > I am a new performer user and am wondering if there is a hardware
> > limitation that prevents me from performing multiple projective
> > textures?
> >
> > I have an app that is projecting texture from a pfLightSource using a
> > frustum to define the camera's field of view. When I add two
> > projections I see some really wierd artifacts and no second projection.
> >
> > I am just wondering if anyone else has tried such a thing.
> >
> > Thanks,
> >
> > Dan Small
> Hi Dan,
>
> This is Ram. How are your doing ? I guessed your question is from the
> problem you were working on. I don't know the answer to your question,
> but remember, I told you about Angus Dorbie, the projected texture GUY
> from SGI. He posted a very cool demo on PTex, a couple of days back on
> the maillist. Did you check it ?
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