rec.autos.simulators

GPL - Frame Rate Limits ?

Larr

GPL - Frame Rate Limits ?

by Larr » Tue, 20 Mar 2001 03:43:09

Is it just me, or is GPL limited to around 36fps no matter what hardware you
throw at it ?

Now, I get 36fps pretty much all the time, everywhere, but it never exceeds
36fps.

Is this normal ?

-Larry

Jim

GPL - Frame Rate Limits ?

by Jim » Tue, 20 Mar 2001 04:01:55

yep there's a limit at 36


GraDe

GPL - Frame Rate Limits ?

by GraDe » Tue, 20 Mar 2001 04:54:32

Yeah 36fps is the max for GPL and is accepted by most yet unusually GP got
roasted for it's FPS limit !?!?!

I'm not actually too sure how accurate 36fps is.

I'll get flamed for saying this but people (scientific people) say the human
eye can't detect anything more than 25fps. I find that to be true in a lot
of sims.
Some sims you still notice the difference even up to 30fps but even if you
dip to 32-33 fps in GPL you start to notice it a lot!

I wonder how accurate built-in counters are some times.


Joachim Blu

GPL - Frame Rate Limits ?

by Joachim Blu » Wed, 21 Mar 2001 07:02:22



Hi!

The special problem with GPL is, that its internal physics engine is running
at steady 288 Hz, no matter what fps your hardware is capable of. The only
way to get the output on screen properly synchronized with the internal
physics is to nail the fps-rate on 36 (that's 288 divided by 8) and that's
exactly what GPL is doing. If your hardware is too slow (i. e. your
framerate drops), you'll miss significant information from the physics
engine because of its realtime behaviour and therefore your driving will
become more or less jerky.

Regards
Crash

Leo Landma

GPL - Frame Rate Limits ?

by Leo Landma » Tue, 20 Mar 2001 09:04:34



Which scientific people? Tell them the limits of perception have been
established at well over 100 frames per second.

In GPL the controls are tied to the frame rate. 25 fps makes your driving a
lot less accurate than 36 fps.

Bye,
Leo

Larr

GPL - Frame Rate Limits ?

by Larr » Tue, 20 Mar 2001 09:16:35

So _that's_ why it feels so much better, yet doesn't have higher frame rates
:)

-Larry




> Hi!

> > Yeah 36fps is the max for GPL and is accepted by most yet unusually GP
got
> > roasted for it's FPS limit !?!?!
> > I'm not actually too sure how accurate 36fps is.
> > I'll get flamed for saying this but people (scientific people) say the
> human
> > eye can't detect anything more than 25fps. I find that to be true in a
lot
> > of sims.
> > Some sims you still notice the difference even up to 30fps but even if
you
> > dip to 32-33 fps in GPL you start to notice it a lot!
> > I wonder how accurate built-in counters are some times.

> The special problem with GPL is, that its internal physics engine is
running
> at steady 288 Hz, no matter what fps your hardware is capable of. The only
> way to get the output on screen properly synchronized with the internal
> physics is to nail the fps-rate on 36 (that's 288 divided by 8) and that's
> exactly what GPL is doing. If your hardware is too slow (i. e. your
> framerate drops), you'll miss significant information from the physics
> engine because of its realtime behaviour and therefore your driving will
> become more or less jerky.

> Regards
> Crash

Larr

GPL - Frame Rate Limits ?

by Larr » Tue, 20 Mar 2001 09:15:16

Rats :(

-Larry


> yep there's a limit at 36



> > Is it just me, or is GPL limited to around 36fps no matter what hardware
> you
> > throw at it ?

> > Now, I get 36fps pretty much all the time, everywhere, but it never
> exceeds
> > 36fps.

> > Is this normal ?

> > -Larry

Andrew MacPhers

GPL - Frame Rate Limits ?

by Andrew MacPhers » Tue, 20 Mar 2001 10:15:00


> Which scientific people?

Yuri Geller, Mystic Meg, Eric Von Daniken.... *that* kind of scientific
people ;-)

Andrew McP

GraDe

GPL - Frame Rate Limits ?

by GraDe » Wed, 21 Mar 2001 03:59:57



> > Which scientific people?

> Yuri Geller, Mystic Meg, Eric Von Daniken.... *that* kind of scientific
> people ;-)

> Andrew McP

hehe, well, supposedly that's the fact,
It's like TV, at a correctly timed 25fps you can notice a difference but
come on, after that you can't.

Talk about 60fps, you can't see a visible frame rate change, just a boost in
PC performance.
60fps on a Tv couldn't be detected since you don't have the PC telling you
what it's doing.

25 might be pushing, it, i think you can tell up to 30fps if your sensitive
enough but after that, not really.

Anyway, that's off topic, my point is that you need solid 36fps to run
smoothly in GPL, even 32-33 is jumpy, it's different to all sims.
That leads me to believe that each game seems to have it's own
interpretation of FPS and forgets that it stands for frames per SECOND! due
to slow-mo effects.

Sure, it's easy for a person to add to their own game a graphic telling them
the are getting 100fps, doesn't mean they actually are though.

Andrew MacPhers

GPL - Frame Rate Limits ?

by Andrew MacPhers » Wed, 21 Mar 2001 16:18:00


> supposedly that's the fact

Do a web search for something like "frame rate perception". It's never too
late to be educated :-)

http://www.cdmag.com/Home/home.html?article=/articles/031/105/thw0101...
ml <-------- note the wrap!!

...wouldn't be a bad place to start.

Andrew "I'm sure we haven't had the frame rate debate for at least two
weeks" McP

Andrew MacPhers

GPL - Frame Rate Limits ?

by Andrew MacPhers » Wed, 21 Mar 2001 16:21:00


> It's never too  late to be educated :-)

Ah, this is the link I was trying to find...

http://www.penstarsys.com/editor/30v60/30v60p1.htm

It's the best article I've seen to date.

Andrew McP

Ruud van Ga

GPL - Frame Rate Limits ?

by Ruud van Ga » Wed, 21 Mar 2001 20:31:48





>> I'll get flamed for saying this but people (scientific people) say the
>human
>> eye can't detect anything more than 25fps.

>Which scientific people? Tell them the limits of perception have been
>established at well over 100 frames per second.

>In GPL the controls are tied to the frame rate. 25 fps makes your driving a
>lot less accurate than 36 fps.

So 36fps should be the upper and lower limit. For example, in my own
sim, I read controls as fast as the framerate (could be done better by
having an internal controls frequency as well, independent of
framerate). But I also send out FF information every rendered frame.
Which may have quite some impact, since too much going out (at 100fps
for example) may bottleneck on the FF communication speed.

Ruud van Gaal, GPL Rank +53.25
Pencil art    : http://www.marketgraph.nl/gallery/
Free car sim  : http://www.marketgraph.nl/gallery/racer/

Mikkel Gram-Hanse

GPL - Frame Rate Limits ?

by Mikkel Gram-Hanse » Thu, 22 Mar 2001 02:09:11

Damn good reading...  thanks for the heads-up ;)



> > It's never too  late to be educated :-)

> Ah, this is the link I was trying to find...

> http://www.penstarsys.com/editor/30v60/30v60p1.htm

> It's the best article I've seen to date.

> Andrew McP


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