Re: Re: simulated arm/gripper

On Jul 25, 2005, at 1:37 PM, Andrei Androsoff wrote:

> Sometimes the coordinate system of child objects seems to get  
> messed up as well - moving a parent object will cause the child to  
> rotate (e.g. flexing your elbow will cause your wrist to twist).  
> Again if you make the joint a little bigger or longer, keeping the  
> normals the same, the problem will go away or get worse). I don't  
> know of any more genteel way to put it other than the physics  
> engine is "freaking out".

In general, this sounds like what happens when the physics is  
overconstrained by conflicting joints.  The joints themselves may be  
conflicting with each other, or the joints may be forcing bodies to  
collide improperly, and you're seeing the (improper seeming) results  
of the collision resolution.

- jon klein
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