[ODE] degrees of freedom in a slider - other joint types

Jon Watte (ODE) hplus-ode at mindcontrol.org
Thu Aug 31 15:01:01 MST 2006

STenyaK (Bruno Gonzalez) wrote:
> Using 1d joints, that would be reduced to 420 joints and 285 bodies. I'd  
> love to have that joint available in ODE, since my cpu is already  
> struggling with just one car on screen, and it doesn't even have the whole  
> suspensions modelled (just 5 joints and 5 bodies per suspension).

What do you mean by "struggling" ? 5 joints and 5 bodies should do 
nothing. If you hook them all to the chassis, you get a 21 body island, 
which is a little more work, but no CPU built in the last 5 years should 
be "struggling" with that, by any means, at least if you're sticking to 
reasonable update rates (60-100 Hz) and handle collision well (no 
self-collisions, etc). And using a release library build :-) Maybe with 
dWorldStep(), it being O(N^3) in island size and everything, but is 
anybody still using that?

I haven't actually measured the CPU usage of RayCar, but it's bound to 
be minimal. Of course, that's a smaller system.


          / h+

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