rec.autos.simulators

Well, on the O2 Racer spends a lot of time in the graphics code yes,
up to 95% with 2 cars on the track. But that's just because the
graphics are slow. Fortunately, on the PC, I can get 80fps and still a
lot of time in the graphics. No need to optimise there. ;-) (but
still, the graphics eats up the most).

Lol, yes, the Rank. The Ring, that's where the seconds are. I hardly
ever play GPL, except to see what its physics do. And now, with DX8
and Win2K, it starts stuttering soon and then quickly becomes
unplayable. And I have 256Mb RAM, a Geforce2MX/32Mb, so it should be
able to do 36fps at all times. I just need newer drivers, but I'm not
anxious on doing that.
Best thing would be to take it out of my sig. ;-O

Ruud van Gaal, GPL Rank +53.25
Pencil art    : http://www.racesimcentral.net/
Free car sim  : http://www.racesimcentral.net/

Hm, those quickly get removed when the car gets some speed. I assume
its the differential code I put in; that takes torques from 3
directions, calculates the inertia's and the accelerations at all 3
sides. This is totally new compared to what I did before (just
calculating torque and then wheel spin velocity or rather
acceleration).

It's a separate Fx and Fy formula. So it assumes SA=0 for Fx, and SR=0
for Fy (lateral). This keeps the Pacejka formula 'relatively simple'.
When combing, you get too much force and you have to cap the force at
the circle limits.
The combined Pacejka formula is even worse, it seems; more
coefficients, more trouble.

It's a nice book; I do read some more RCVD sometimes lately, as it
contains more textual knowledge, with which you can understand more.
The Genta book is already useful just on the basis of the Pacejka
formulae alone though (and the appendices with the numbers).

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

  That'd be too cool :-)

  WOW!  The Staccato engine sound demo at their site is awesome.  I've got some
code now that can probably do what I want, it'll be awhile until I can throw
some data in and see what it sounds like.  I just spent the past 3 days getting
an OpenGL system up and running.  BIG improvement over my wireframe graphics,
although really silly looking compared to Racer :-)  Still, it's neat to have
skidmarks again :-)

Todd Wasson
---
Performance Simulations
Drag Racing and Top Speed Prediction
Software
http://PerformanceSimulations.Com

...

Ah, things used to be 'click this button to install', but today you
have a world of time to spend on getting your machine up like you want
to. :)

Ah, skidmarks! Don't have those yet, but some plans are already laid
out on paper. Just eyecandy really. And the sun has started to shine
here, which is really pushing my productivity low. So much nicer to
have diner at the beach with nice girls by my side, than to add a
better torque division algorithm in the differential code. ;-) Makes
me feel more human.

I'll do a beta release of v0.4.5 tonight I think. So many things that
ramble, but the way things are going now, it's slowing down a bit due
to the summer, and doing 3 platforms is beginning to get a mess (esp.
with my Linux machine not neatly hooked to the other machines, making
scripting a bit harder).

Ah well. First I'll have to watch the last part of the F1 race. Missed
it because I was on the beach. ;-)

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