[ODE] how to glue bodies together ?
coding at natew.com
Thu Jan 29 19:18:59 MST 2004
On Thu, 29 Jan 2004, Brian Clarkson wrote:
> >Our application aims on very accurate collision detection.
> >So, computation time is not critical, but accuracy is .
> >Detecting breaking is not our goal either.
> I think the detection of break forces on joints is very much part of
> body physics. Just as much as collision. A very efficient fixed joint
> would be very useful for this. There are several benefits to breakable
> joints for sub bodies which need to break apart.
I haven't actually tried this, but:
It seems to me that it should be pretty straightforward to NOT use
fixed joints, and instead compute the amount of force (torque and/or
linear) present at the location of the 'virtual joint.' If that force
exceeds a certain limit, then create a second body and give it the mass
and geoms of the object that is supposed to be breaking away.
I'm pretty sure that would take much less CPU time than a fixed joint
> All this is for free once you implement Roel's breakable joints. I did
> and it has introduced another level of realism to our RTS.
Does Roel implement the mass-combining and mass-separating functions, or
is his code implemented as multiple ODE bodies connected with fixed
I have no doubt that fixed joints speed development - and that's a good
thing - but I wonder about the CPU demand of a joint that removes all
degrees of freedom.
Redmond WA USA
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