Re: Stencil question

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Ran Yakir (rany++at++rtset.co.il)
Fri, 30 May 1997 09:35:04 +0000

On May 29, 6:30pm, Joaquin Casillas Melendez wrote:
> Subject: Stencil question
> Hi all!
> I am trying to draw an objet over a given plane, and I don't want the
> object to be drawn outside the limits of the plane. In opengl this can be
> achieved by drawing the plane (floor) and at the same time writing a
> certain value to the stencil buffer. Then, in the draw routine, the
> object will be drawn only over the pixels with that a certain value.
>
> I don't know the way to do this in Performer, so any help would be
> appreciated.

In Performer you'll do it very much the same way. You'll have to call the
OpenGL stencil calls from within Performer's pre and post drawing callbacks.
Have a look on the man pages for pfNodeTravFuncs

Ran

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