Parenting a rigid body: Physics problem I made a car using the Vehicle Controller (demo file at the end/bottom of the page) concept.

It's a "rigid body" chassis, that attaches four "no collision" wheels at run-time. It works pretty good, except for this :

I modeled a "car body" and parented it to the chassis, but no matter what settings (mass/radius/form factor) I try (for both the chassis and the body) I cannot seem to make the car body a "rigid body" (or anything else than "no collision") : When I press "p" my car flies frantically up like a balloon...?




Exactly what is the force that makes my car fly up like this ?
The child's mass, radius and form factor values should generally be smaller than those of the parent's, right?
Do I have to make sure the parent and the child don't intersect?
Are there other variables that I should look for?
just use a generic rigid body joint constraint -> 6dof and lock all the values to 0

Also, you are going to want to check linked collision (so it won't collide with the chassis)

one thing to note, rigid body joints are broken in 2.73a if you delete any item, it remove ALL rigid body joints in the scene...