rec.autos.simulators

GPL AI glitch and Physics Anomoly

Jeff Ha

GPL AI glitch and Physics Anomoly

by Jeff Ha » Fri, 27 Nov 1998 04:00:00

One to add to the AI quirks and another wierd physcis issue.

While racing at the Dutch circuit with 19 AI I was stalking McClaren.
As we came down the hill and around the final right hander, I got on
the throttle earlier than he did and was looking to pass him on the
front straight. The flagman held up the slow car ahead sign as we
flashed past and rather than move over to the left, the lead car
slammed on his brakes! Needless to say, with me accelerating on his
tail, we had a major coming together. He continued, I had a broken
front wheel.  What a time for a brake test!

The wierd physcs deal I've seen before.  I was racing on-line at Rouen
and I was braking for the hairpin but not having really good luck
doing it. I almost got it stopped but ended up taping the guy in front
turning in. Rather than a little nudge,  I was sent flying into the
air and the Lotus I hit bounced around like a pinball-- off the tires,
back into me several times and ended up catching on fire.  All this
from a simple 30 mph nudge!.  I had this same thing happen at Monaco
at the loew's hairpin when a Ferrari bumped a guy behind me, the Lotus
bumped me and some how the guy who started it (at very slow speed)
ended up at the bottom of the hairpin straight severely damaged and on
fire. How he flew over the both of us is beyond me.  The collisions
seem to be a bit over the top at times.

I have also seen some bizarre stuff at starts. From standing
stationary I've been thrown up into the air, watched other cars thrown
up into the air.  I don't know if this happens when people join the
race late after the flag drops and then are dropped into the moving
grid or what.  This might be the reason.

Jeff

ymenar

GPL AI glitch and Physics Anomoly

by ymenar » Fri, 27 Nov 1998 04:00:00

Jeff Haas wrote

Online things are a little different. The same can be applied for the NROS.
Because of the warp issue found via racing over the Internet, your car may
appear for a moment at a relatively high speed for a little fraction of the
second.  If during that time you get a car-to-car contact you will see the
fun but bizarre wreck that sends you way up in the air  ;)  .  Since if I
remember the prediction code is not in GPL (Im not sure about that), you
will have stuff like that.  Im not sure, still, but it might be also that
the Z-axis of the new game engine isn't totally perfected ;(

- Fran?ois Mnard <ymenard> Good race at the Brickyard!
- Official Mentally retarded guy of r.a.s.
- Excuse me for my English (I'm French speaking)
- Sponsored by http://www.awpss.com/ on the NROS
- "People think it must be fun to be a super genius, but they don't realise
how hard it is to put up with all the idiots in the world."--

Remco Moe

GPL AI glitch and Physics Anomoly

by Remco Moe » Fri, 27 Nov 1998 04:00:00


>I have also seen some bizarre stuff at starts. From standing
>stationary I've been thrown up into the air, watched other cars thrown
>up into the air.  I don't know if this happens when people join the
>race late after the flag drops and then are dropped into the moving
>grid or what.  This might be the reason.

It has something to do with warping. If your car, due to warping,
"overlap" another car by, say 10", you can imagine what force is
needed to do that. The physics engine respond to that, with this
strange behaviour as a result. You only experience it on-line.

Remco

Jeff Ha

GPL AI glitch and Physics Anomoly

by Jeff Ha » Sat, 28 Nov 1998 04:00:00


Thanks,  you know I never considered the warping aspect as a cause to
create those forces but it makes sense.  This is my first real
experience with on-line games.

Thanks.

Jeff

SteveBla

GPL AI glitch and Physics Anomoly

by SteveBla » Sat, 28 Nov 1998 04:00:00

Not so sure about that.  I have a short  replay of an offline race  in which I
get together with an AI car in Eau Rouge at Spa and go sliding benignly along
the armco.  Next thing you know, my car is catapulted vertically about 2 or 3
times the height of those tall trees on the hill left of the track, flipping
endlessly about its rear axle as both front wheels go positively into orbit.
You could see into Germany from up there.  I don't know what happened there,
but it sure wasn't realistic.   WAS pretty cool, though, and the scenery
graphics go all weird from a quarter-mile up.  Email me if you'd like to see
it;  just make sure your seat is upright and tray table is in the locked
position!

Steve B.

Steve Blankenship

remove "nospam" from address for email

Bart Westr

GPL AI glitch and Physics Anomoly

by Bart Westr » Sat, 28 Nov 1998 04:00:00

Have a look at this: www.xs4all.nl/~westrab/crashtest.zip
The AI (or remote cars when racing online) do not always detect collisions.
But once they are acting out of the normal they do, which can give chain
reactions. If you try a few times, you can see them piled up 3 high! The
mahem is started by the local car colliding with the ai in front of him when
he lands on the grid.

Bart Westra



>>I have also seen some bizarre stuff at starts. From standing
>>stationary I've been thrown up into the air, watched other cars thrown
>>up into the air.  I don't know if this happens when people join the
>>race late after the flag drops and then are dropped into the moving
>>grid or what.  This might be the reason.

>It has something to do with warping. If your car, due to warping,
>"overlap" another car by, say 10", you can imagine what force is
>needed to do that. The physics engine respond to that, with this
>strange behaviour as a result. You only experience it on-line.

>Remco

David Ewin

GPL AI glitch and Physics Anomoly

by David Ewin » Tue, 01 Dec 1998 04:00:00


> >It has something to do with warping.

> Not so sure about that.  I have a short  replay of an offline race  in which I
> get together with an AI car in Eau Rouge at Spa and go sliding benignly along
> the armco.  Next thing you know, my car is catapulted vertically about 2 or 3
> times the height of those tall trees on the hill left of the track, flipping
> endlessly about its rear axle as both front wheels go positively into orbit.
> You could see into Germany from up there.  I don't know what happened there,
> but it sure wasn't realistic.   WAS pretty cool, though, and the scenery
> graphics go all weird from a quarter-mile up.  Email me if you'd like to see
> it;  just make sure your seat is upright and tray table is in the locked
> position!

I had a similar experience (offline) yesterday while testing at Monza.
I was hotlapping in an Eagle when I lost it trying to go flat out around
the Ascari bend.  I hit the right guard rail at around 165 mph bounced
over to the left guard rail and hit it at about 95 mph.  So far so
good.  But after hitting the left rail the car started to spin and took
off like a helicopter.  It proceeded to climb at least 200 feet in the
air.  It hit an invisible barrier while up there and came crashing
down.  It's absolutely hilarious.

Is there a site that collects these sort of moments?

Dave Ewing

Sammy Fische

GPL AI glitch and Physics Anomoly

by Sammy Fische » Thu, 03 Dec 1998 04:00:00


> I had a similar experience (offline) yesterday while testing at Monza.
> I was hotlapping in an Eagle when I lost it trying to go flat out around
> the Ascari bend.  I hit the right guard rail at around 165 mph bounced
> over to the left guard rail and hit it at about 95 mph.  So far so
> good.  But after hitting the left rail the car started to spin and took
> off like a helicopter.  It proceeded to climb at least 200 feet in the
> air.  It hit an invisible barrier while up there and came crashing
> down.  It's absolutely hilarious.

> Is there a site that collects these sort of moments?

> Dave Ewing

Did you change anything in gpl.ini? I once copied a driver.ini on top of
gpl.ini. All cars behavied like pogo Stick afterward, just bouncing up
and down.
(Looked rather funny, but very difficult to drive;)

bye,
Sammy


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