[ODE] Car simulation

[Michael Sebastian Sbrissa Bortolin]

I set the velocity to -dInfinity and the results were crazy. First: the mass of the car is 1.5 and Im applying a torque > 170 N.m, this make the simulation runs unstable, I cant control the car. So I try to divide the torque by 1000, and it works perfectly.

I thought the car mass was wrong, so I set to 1500 and apply the torque without divide by 1000, now, other crazy things happen: the car sink in the ground... then only way to the car stay above the ground is:

	contact[i].surface.soft_erp = 0.0;
      contact[i].surface.soft_cfm = 0.0;

But in this way, the car dont move, the wheels spin but the car seems to be heavy. 

Regards.

-----Original Message-----
From: Adam Rotaru [mailto:adam_rotaru@yahoo.com]
Sent: segunda-feira, 4 de fevereiro de 2002 19:12
To: Michael Sebastian Sbrissa Bortolin
Subject: Re: [ODE] Car simulation


--- Michael Sebastian Sbrissa Bortolin
<michael_bortolin@dell.pucrs.br> wrote:
> I need some help. I'm trying to do a  car simulation
> with ode and I want to know how do I do to move the
> car only applying a torque on the wheel. I modified
> the buggy demo to do my car simulation. In real
> life, the engine of a car apply only some torque on
> the wheels, but in ode, beyond torque, I need to set
> the desired velocity.

Initially the need to set the velocity requirement
confused me too.
However, you can set the velocity to some very big
value,
and set the maximum allowed torque to what you want. 
The value
of the velocity doesn't matter, since it is too big
(it would require
much higher torqus), and the max torque value becomes
the
limiting factor.  The direction of the velocity does
matter though.
I do recommend using joint motors instead of setting
torques directly.

cheers,
  --adam




__________________________________________________
Do You Yahoo!?
Great stuff seeking new owners in Yahoo! Auctions! 
http://auctions.yahoo.com