Re: Multi-Channel Option(MCO) problem

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Mario Veraart (rioj7++at++fel.tno.nl)
Thu, 17 Oct 1996 11:52:35 +0200 (MET DST)

> This is Ren-Jye Yu. I have some problems when I use Multi-Channel
> Option(MCO). I use Performer to write the code and use MCO to show the scene in
> three different monitors. When I start the MCO, the average video frame rate
> will drop down seriously. At least 70% below running the same Performer code on
> the default monitor. Why does the MCO destroy the refresh rate time? The MCO
> is running three channels (2 ++at++ 640x480 and 1 ++at++ 1280x1024.) We have a reality
> engine 2, R4400 processor, 256 Mb RAM, and 2 video raster boards.

I think is because the draw process has to draw the scene three times.
Show the statistics and look whats different in the app, cull and draw times
for the two distinct situations.
When the only difference is that you set the MCO board in MCO mode or not
then it's very strange you get a frame drop. Make sure that in the non MCO mode
the screen that is served by the X-window manager is large enough to hold
the performer window with the three channels

Mario
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