Re: How to get Rates Greater than 60HZ????

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Allan Schaffer (allan)
Fri, 30 May 1997 16:06:23 -0700

On May 30, 2:53pm, Patrick Roberts wrote:
> I have an application that will require a 120 HZ frame rate with a
> 256x256 pixel window. In order to test display speed, I have reduced
> the display object down to 4 textured traingles. I can maintain 60HZ
> with great reliablity but am unable to exceed 60HZ. As soon as the
> program starts to run I get the following message from performer "PF
> Notice: Using 60 HZ video rate".
>
> Any Ideas how to get into a 120 HZ mode???
>
> I have tried the following:
> 1) change the graphics refresh from 60 hz to 120 hz
> #> /usr/gfx/setmon 640x512_120s

This is a 60Hz stereo (120Hz per field) format. I don't think SGI
ships any "regular" video formats faster than 76Hz on the RE2.

You could probably trick Performer into rendering at this speed by
treating it like a stereo application -- alternate "standard"
rendering between the left & right buffers. Check out the stereo
samples on our web site for ideas.

Allan

-- 
Allan Schaffer                                                allan++at++sgi.com
Silicon Graphics                               http://reality.sgi.com/allan
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