rec.autos.simulators

Has Papyrus ever written a "white paper" about the GPL physics engine?  As
a mechanical engineer, I would love to read about the simulation right
down to the smallest detail.  Are there any web-based references?  I've
read little snippets of information, but I'd love to find one article that
puts it all together in one place.

Stephen

I love you, Ratbag!

xoxoxox
rusty

Steven, you're talking about something which Papyrus/Sierra probably have
locked in a vault!! :o)

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: Steven, you're talking about something which Papyrus/Sierra probably have
: locked in a vault!! :o)

OK, my note could be misinterpreted.  I don't care how they coded it, and
by smallest detail, I just mean is there one place that gathers all the
snippets of information together (engine frequency, number of DOFs, which
DOFs are modelled etc.)  I've seen all the bits and pieces in various
USENET postings and I was just wondering (hoping) if it was ever all drawn
together into a "technical FAQ" somewhere for the gearheads in the
audience.

Stephen

:> Has Papyrus ever written a "white paper" about the GPL physics engine?  As
:> a mechanical engineer, I would love to read about the simulation right
:> down to the smallest detail.  Are there any web-based references?  I've
:> read little snippets of information, but I'd love to find one article that
:> puts it all together in one place.
:>
:> Stephen
:>

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On Mon, 6 Sep 1999 21:13:34 +1000, "Bruce Kennewell"

<sarcasm>

Why? It's not like they're planning to DO anything with it...

</sarcasm>

        Speaking of such... has anyone figured out the distance between the
full extended to full compressed angles vs the bump ***s in each
chassis?

        What I'm after is,  What is the suspension travel length between full
extended suspension and when the bump ***s are being touched.  I'm
taking a guess that there is three inches of travel in the Ferrari.  I
took the spring rate, Bumb setting, time traveled.  Then feeling my
chassis to road grip slowly change and then come to a point where it
drastically changes.  I've also drove my car up a steep hill at an angle
that would place one front wheel on the hill and the other dangling in
mid air and took a guess at the travel that the compressed corner took.

        These are not very accurate at all but it at least gives me a round
about figure.  Does anyone know of a better way?  or even better yet,
does anyone know the specific travel distance for each chassis?

Mike

--
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I would be interested in some more of the ins and out just out of curiosity.
For example, I noticed that if I floor the accelerator in neutral obviously
after a while the engine blows.  If I do the same thing with the clutch in
(pedal pressed), the engine blows a little bit sooner.  So are they modeling
the extra drag of the clutch not being engaged or did this just occur by
chance do to the small number of times I tried this little experiment.

I think there would be a way to convey these fascinating insight to this
great simulation without giving away their secrets.

Russell Keating http://www.netwave.net/members/rkeating

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LOL.... that one will get BK going.

Jan.
----

Hmm, not quite sure what you're asking...  But I can tell you this:  As I
recall, Alison Hine mentioned that one of the Papy programmers (Dave Kaemmer
or Randy Cassidy, can't remember which) told her a 1" rideheight with 1"
bump ***s means your car is resting on the bump ***s when you're just
sitting still.  So maximum upwards suspension travel is variable, and is
always equal to rideheight.  I guess we're s'posed to presume that was just
the way the cars were constructed.  A way to change the rideheight without
changing suspension travel would be nice, but the cars simply werent built
that way.  As for downwards suspension travel, I have no idea how you can
figure that out.

    -A

I read somewhere in a document published by Papy that this is indeed modelled,
so it's not random.

I also read that there's 17 DOF in the model. I remember thinking that the
explanation didn't quite add up though... Maybe I'll gather the energy to
count them later.

Cheers,
    /ft

Here's a David Kaemmer interview,
if you haven't seen it yet.  He mentions
they modeled the flywheel rotor and
gyroscopic effects.

http://gpl.krej.cz/kaemmer.html

Tom