GPL 36 fps limit, why?

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 Go #43 and #44! volksy (at) geocities (dot) com volksy (at) yahoo (dot) com >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)

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

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)

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

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

>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

> >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

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> >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

....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?

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

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>> >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

UNC <G> Mark

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> ....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?

>....and, just as importantly, is that Metric, Whitworth or BSF? >-- >Best regards, >Bruce. hey Bruce, you've spelt BSF wrong ;-) Andy.

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.

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 >> ===============================================