Re: how to stopbody enabling by joint

Mark Williams pisze:

Krystian Ligenza wrote:

I have look more in mailing list archive, and see that this topic was
many times discussed. Main problem is how to set that joint should only
affect one body and other left unforced. Maybe we should think about
adding flag for this, by adding dJointSetXXXParam with dParamAffectBoth,
dParamAffectFirst, dParamAffectSecond? If joint can link with world,
this should not be impossible to do - correct me if I'm wrong?

Why wouldn't you just create the joint attached to the affected body and
the world (NULL), then? I do that for collisions in certain cases, for
example.

If you attach a joint to a null-body, then the joint considers that body
to have zero velocity. This is a potential source of error when
colliding against non-simulated yet animated geoms. I think Krystian's
patch has a great deal of value.

Hope that you are talking about "void dJointSetFixedBodies (dJointID
j,const dVector3 p1,const

dQuaternion q1,const dVector3 p2,const dQuaternion q2)" function that I
proposed for adding, becouse I haven't add what I was talking about in
this mail (about dJointSetXXXParam ). I have thought, that only thing
that is need to be change for all joints is XXXGetInfo2(...), but It
seems that all step functions also check if joint is attached to Body
and World, so this become too time consume for me to make it good. Also
joint can be attached to World - Body, or Body - World, but internally
it is always Body-World, so making a param that hide one of Bodies as
World would be a tricky part.

Cheers,

Krystian

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