Ok. :) It shouldn't be hard to retry, but I've got my hands full on
jittering tire & suspensions right now. I think I'm going to try and
combine the tire rate to the wheel rate (S1*S2/(S1+S2)), that should
make it much better, but I don't really know if I'll miss out on great
tire rate effects.
Anyway, there's a big thread on that on the Racer forum, and damn, a
Champcar is really a springy thing right now. :(
You're welcome. Make sure if scale=1 not to mix but to just copy
ofcourse. ;-)
Yes, he does. Like a binary search for the time. Start with t+dt, if
penetration exists, undo all and try t+0.5*dt and binary searching on
and on. Ofcourse, you could do things more intelligently and check the
distance of the penetrating objects at time t, then at time t+dt, then
weigh that to come up with a much better try.
Yes, I'll run the 1000 cars demo again (which btw only has 100
cars?!). The problem I think is with lots of stacked objects (in
FastCar).
Baraff wrote a SIG paper in '94, which includes a new method to
calculate restraint forces, saying it is much simpler and easier to
implement. But ofcourse I'm stuck at page 3 already. ;-) All these 'A
is semi-posi-definite?!' things, man, I need a linear algebra book.
Too bad no code was included. It seems to improve on his original
papers, Unconstrained Rigid Body Dynamics and the Constrained (part
II) followup, where quadratic programming is used.
The '94 method seems to use a similar method to FastCar's, but only
wrt forces, where FastCar uses translation.
Wow, finally. :) And note that 'u' wasn't wheel spin velocity, but the
translational velocity, as Gregor corrected me. Read his post, it will
have the definite correct terms. ;-)
Ruud van Gaal
Free car sim : http://www.racesimcentral.net/
Pencil art : http://www.racesimcentral.net/