Re: How to black out a channel

William Briggs (stimpy++at++niesten.arc.nasa.gov)
Tue, 14 Jun 94 08:54:29 -0700

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The way we clear the channel is by setting a Draw callback with
  pfChanDrawFunc( channel, drawfunction ).
We allocate a PassData structure which holds a "clear channel only" flag with
  pfAllocChanData( channel, sizeof( PassData ) ).
In drawfunction we call
  pfClearChan( channel )
and return if the "clear channel only" flag is set, otherwise render
the channel.

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William Briggs | MailStop 262-2 | "The computer screen
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