rec.autos.simulators

GPL 36 fps limit, why?

Ken Bear

GPL 36 fps limit, why?

by Ken Bear » Mon, 07 Jun 1999 04:00:00

It is something technical, I think it has to do with the maximum rate that
the physics part of the game is running or something.

Papy sims have always had this (other than maybe Indy 500) - IndyCar Racing
1 had a 15fps limit, NASCAR1,2,etc. and ICR2 had 30fps limits.  In ICR2 with
the Rendition, you could override this and get 60-70fps, which looked
awesome.  But it could do weird stuff apparently since the graphics rate
wasn't tied to the physics rate.

The nuts and bolts I don't claim to understand though :-)

--
Ken's Sig 3.0

"Who is the more foolish?  The fool, or the fool who follows him?" - Obi-Wan
Kenobi

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>Hi,
>Maybe I should be addressing this post to Papy, but I am sure
>they have better things to do than answer dumb posts like
>this, like getting the patch out the door!   I was just
>wondering why there is a 36 fps limit on the GPL frame rate?
>Probably a good technical reason, but why?

>Also, I hope the forthcoming patch has a facility for saving
>your race (so far as) after you get 'disco'ed' from a race,
>surely this must still be in memory somewhere, it would be
>nice to be given the option of saving the replay upto where
>you got bounced out!
>Just a thought... (or two).
>Dave Hawnt (UK-GPL)

Eric T. Busc

GPL 36 fps limit, why?

by Eric T. Busc » Mon, 07 Jun 1999 04:00:00

GPL's base unit of time is a tick which corresponds to 1/36th of a
second, and everything in the game runs at some multiple or fraction of
this unit (i.e. the player's physics are updated 8 times a tick or at
288Hz).  Hence the 36fps limit ensures that everything is properly in
sync and the 'world' can be safely redrawn each tick.

Eric


Dave Hawn

GPL 36 fps limit, why?

by Dave Hawn » Tue, 08 Jun 1999 04:00:00

Hi,
Maybe I should be addressing this post to Papy, but I am sure
they have better things to do than answer dumb posts like
this, like getting the patch out the door!   I was just
wondering why there is a 36 fps limit on the GPL frame rate?
Probably a good technical reason, but why?

Also, I hope the forthcoming patch has a facility for saving
your race (so far as) after you get 'disco'ed' from a race,
surely this must still be in memory somewhere, it would be
nice to be given the option of saving the replay upto where
you got bounced out!
Just a thought... (or two).
Dave Hawnt (UK-GPL)

Andrew MacPhers

GPL 36 fps limit, why?

by Andrew MacPhers » Tue, 08 Jun 1999 04:00:00

Not sure about others, but I find even small variations in frame rate (for
instance slight drops entering busy corners) very distracting. So fixing
the frame rate at the top end seems like a good idea as long as that
number's high enough. It must -- I imagine -- also make interfacing with
the simulation core (running a lot more frequently) a bit simpler.

As for why 36... well, I've seen an article which gave 72fps as being the
top end of human perception. Seems like a suspiciously coincidental figure
to me. But, like most coincidences, it's probably just that :-)

Andrew McP

Ron Ayto

GPL 36 fps limit, why?

by Ron Ayto » Tue, 08 Jun 1999 04:00:00

Hi Dave,
I also hope this is implemented.
Getting discoed is bad enough, but to lose the replay up to the point
of disconnection, really is a bummer...
I have lost many a fast lap time and good dicing duels through being
discoed and not being able to save the replay, not to mention often
needing the replay for league administration tasks...
Cheers,
Ron



John Walla

GPL 36 fps limit, why?

by John Walla » Tue, 08 Jun 1999 04:00:00



>As for why 36... well, I've seen an article which gave 72fps as being the
>top end of human perception. Seems like a suspiciously coincidental figure
>to me. But, like most coincidences, it's probably just that :-)

Something like that, but not exactly that. The physics run at 288hz,
36fps is 1/8th of that 288hz.

Cheers!
John

Florian Kernle

GPL 36 fps limit, why?

by Florian Kernle » Tue, 08 Jun 1999 04:00:00




> >As for why 36... well, I've seen an article which gave 72fps as being the
> >top end of human perception. Seems like a suspiciously coincidental
figure
> >to me. But, like most coincidences, it's probably just that :-)

> Something like that, but not exactly that. The physics run at 288hz,
> 36fps is 1/8th of that 288hz.

> Cheers!
> John

But why 1/8th?

Dex

Bruce Kennewel

GPL 36 fps limit, why?

by Bruce Kennewel » Tue, 08 Jun 1999 04:00:00

....and, just as importantly, is that Metric, Whitworth or BSF?

--
Best regards,
Bruce.
======
The Stunned Mullet........seriously satirical stuff!
http://welcome.to/the_stunned_mullet
===============================================


>But why 1/8th?

Ruud van Ga

GPL 36 fps limit, why?

by Ruud van Ga » Tue, 08 Jun 1999 04:00:00

On Mon, 07 Jun 1999 12:03:12 GMT, "Florian Kernler"






>> >As for why 36... well, I've seen an article which gave 72fps as being the
>> >top end of human perception. Seems like a suspiciously coincidental
>figure
>> >to me. But, like most coincidences, it's probably just that :-)

>> Something like that, but not exactly that. The physics run at 288hz,
>> 36fps is 1/8th of that 288hz.

>> Cheers!
>> John

>But why 1/8th?

288/36 = 8

t=frameCount();
for(i=0;i<t*8;i++)
{ DoPhysics();
Render();

Ruud van Gaal
MarketGraph / MachTech: http://www.marketgraph.nl
Art: http://www.marketgraph.nl/gallery

Mark Seer

GPL 36 fps limit, why?

by Mark Seer » Tue, 08 Jun 1999 04:00:00

UNC <G>

Mark

> ....and, just as importantly, is that Metric, Whitworth or BSF?

> --
> Best regards,
> Bruce.
> ======
> The Stunned Mullet........seriously satirical stuff!
> http://welcome.to/the_stunned_mullet
> ===============================================

> >But why 1/8th?

Andrew Middleto

GPL 36 fps limit, why?

by Andrew Middleto » Tue, 08 Jun 1999 04:00:00


>....and, just as importantly, is that Metric, Whitworth or BSF?

>--
>Best regards,
>Bruce.

hey Bruce, you've spelt BSF wrong ;-)

Andy.

Bruce Kennewel

GPL 36 fps limit, why?

by Bruce Kennewel » Wed, 09 Jun 1999 04:00:00

Ooops! Sorry.
"Bee Ess Eff".

--
Best regards,
Bruce.
======
The Stunned Mullet........seriously satirical stuff!
http://welcome.to/the_stunned_mullet
===============================================



>>....and, just as importantly, is that Metric, Whitworth or BSF?

>>--
>>Best regards,
>>Bruce.

>hey Bruce, you've spelt BSF wrong ;-)

>Andy.

Bruce Kennewel

GPL 36 fps limit, why?

by Bruce Kennewel » Wed, 09 Jun 1999 04:00:00

Yep....I forgot that one, Mark. Thanks! :o)

--
Best regards,
Bruce.
======
The Stunned Mullet........seriously satirical stuff!
http://welcome.to/the_stunned_mullet
===============================================


>UNC <G>

>Mark


>> ....and, just as importantly, is that Metric, Whitworth or BSF?

>> --
>> Best regards,
>> Bruce.
>> ======
>> The Stunned Mullet........seriously satirical stuff!
>> http://welcome.to/the_stunned_mullet
>> ===============================================



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