Re: Using Stencil buffer

From: Scott Herod (herod++at++rtset.com)
Date: 06/29/2000 12:08:46

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Publishing User wrote:

> I want to add a round window/channel to simulate using
> telescope viewing from a tower, I think using multi-channel
> and stencil buffer is the solution, but i don't know
> how to set the round mask onto stencil buffer?
>
> Hui
>

  You don't need to use a multi-channel approach. I've done similar
things a couple of different
ways. The easiest, but probably not the most efficient, is to create the
mask that you want and
in a draw callback do a glDrawPixels then call pfDraw. It is probably
more efficient to create
some geometry to act as a mask and use channel drawing bins to draw it
first, swapping the
stencil ops as you go.

Scott Herod

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