Re: Shadows with Performer ?

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Bernard Leclerc (bleclerc++at++cae.ca)
Wed, 1 May 1996 11:54:19 -0400

On Apr 29, 10:46am, pere1++at++VIDEO3.cluny.ensam.fr wrote:

> I would like to render shadows with Performer.It seems that Performer
> has not any fonction to do that. So I look on the OpenGL Programming Guide,
> it is told how shadows work but there isn't any sample code.
> So I send a message (not in a bottle ...)
> Could somebody help me?
>
> My application is a 3D terrain with thousands trees (yes, it is
> possible!). For the moment I duplicate all the facets on the forest terrain
> with a opacity mapping of a shadow image. It works well but it isnt the
> economical version.
>
> I am looking for:
>
> 1) A sample code of how to render shadows of one object to another
> or
> 2) A sample code of how to map an image (shadow image for example) on a
> projector

You do not mention if you're using IrisGL or OpenGL. It makes all the
difference. Take a look at the sample programs

        /usr/share/Performer/src/pguide/libpf/C++/shadows.C
        /usr/share/Performer/src/pguide/libpf/C/shadows.c

These programs work only with IrisGL.

If you're targetting OpenGL, you're out of luck.

--
      ___/      |        ___/	Bernard Leclerc		e-mail: bleclerc++at++cae.ca
     /        / |       /	Systems Engineer	voice: +1 514 341 2000
    /        /  |      __/	CAE Electronics Ltd.		extension 2275
   /        /   |     /		8585 Cote De Liesse	fax:   +1 514 340 5496
  /        ____ |    /		P.O. Box 1800
_____/   _/    _|  _____/	Saint-Laurent, Quebec, Canada, H4L-4X4

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