Re: Frame rate drop down seriously!!!!

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Angus Dorbie (dorbie++at++bitch.reading.sgi.com)
Thu, 23 Jan 1997 17:43:56 +0000

On Jan 23, 4:44pm, Martin Reddy wrote:
> Subject: Re: Frame rate drop down seriously!!!!
>
>
> Under the current implementation of IRIS Performer, the frame rate is
            ^^^^^^^
And always will be, this is very desirable since you'd see the image
breaking up if Performer didn't wait for the video to refresh between
swaps. This is one of the fundamental rules of real-time animation.

> constrained to be an integer multiple of the video refresh rate. Your
> video refresh rate is 72 Hz and so if the simulation is unable to run at
> 72 Hz, then it will drop down to the next integer multiple of 72, i.e.
> 72 / 2 = 36 Hz.
>
> > I have a serious frame rate problem when I create three channels on one
> > pipeline. When I run my program in three channels, frame rate will drop
down
> > form 72Hz to 36 Hz. If I close one channel and remain two of them, the
frame
> > rate will repeatly jump from 72Hz to 36Hz and back to 72Hz.
>
> +============================================================================+
> | Martin Reddy Dept. of Computer Science
|
> | University of Edinburgh
|
> | e-mail : mxr++at++dcs.ed.ac.uk Mayfield Road, EH9 3JZ
|
> | http://www.dcs.ed.ac.uk/home/mxr/ Tel : (0131) 650 5164
|
> +============================================================================+
>-- End of excerpt from Martin Reddy

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