I've tried writing a start-stop frame loop, and it seems to work fine.
You have to make sure you know when objects are moving in the scene. I
also added a periodic redraw (i used something between once a second and
once every 5 seconds) just so the app wouldn't get swapped out and have
trouble waking up quickly.
Are there any other perceptual drawbacks to the start-stop approach,
assuming you can start and stop the frame loop reliably?
-ellery-
Bob Kuehne wrote:
> we'll have to agree to disagree. i think rendering when data hasn't
> changed is a bad use of system resources. what matters ultimately
> isn't frame-rate, but _perceived_ frame-rate, and if the user is
> staring at an immobile object from an immobile view, 60Hz is no better
> than 1Hz.
>
> eof.
> b
>
> On Nov 15, 2007, at 10:43 AM, Robert Osfield wrote:
>
>
>> On Nov 15, 2007 3:19 PM, Bob Kuehne <[EMAIL PROTECTED]> wrote:
>>
>>> in fact, what paul says is very similar to what i often do in test
>>> apps:
>>>
>>> while ( !viewer.done() )
>>> {
>>> usleep( timeToSleepToGetMeToMyDesiredFrameRate );
>>> viewer.frame();
>>> }
>>>
>>> in a more commercial-style app, i'd recommend only redrawing when
>>> data
>>> actually
>>> changes. so in a cad app, when the user moves the mouse, or edits the
>>> data, in a
>>> flight sim, when the eyepoint, or any on-screen data changes, etc.
>>>
>> Yikes, I don't quite agree with this. All apps should have vysync on
>> for sure. Interactive apps need't run a constant frame loop - and can
>> just dispatch a frame when users moves the eye point, etc. However,
>> for simulators and games the frame loop is critical, it is what needs
>> to run a solid frame rate and locked to vysync, you shouldn't try to
>> drive simulators like interactive applications, and flight sim is a
>> great example of something that should run at a solid frame.
>>
>> Robert.
>> _______________________________________________
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>>
>
> bob kuehne
> founder and ceo - blue newt software
> www.blue-newt.com 734/834-2696
>
>
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>
>
>
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