How to black out a channel

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Ivan Bach (ib++at++ivan)
Thu, 9 Jun 1994 18:37:40 +0100

Hi

I'm in the midle of making a multi-user Performer demo.
I have up to 4 channels, each representing a different users
viewpoint. I have a VTX, with an MCO, so all the channels
render to the same virtual screen, and I then send the video to
diffreent monitors (up to 4), via an MCO. I have set
things up so that all channels share thins like SWAPBUFFERS,
EARTHSKY etc.. At various points within the application I wish to turn
off arbitrary channels. I would like the view point in these channels to
be then set to black (or some other constant colour). My
question is, how do I do that. I tried

 pfChanTravMode ( chan, PFTRAV_DRAW, PFDRAW_OFF);

but this only stops any more rendering.

I also tried having

 pfChanShare (chan, PFCHAN_SWAPBUFFERS);

pfClearChan(chan);

for two frames before the rendering stops, to clear the
channel, but that did not seem to work.
Anyway, I'm sure there is a simple way to do what I want.
Anyone know how? I suppose I could just write the data
r,g,b=0,0,0
by hand into the frame buffer) but is there
an easier way.

Thanks
Richard Gallery

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