public GameObject makeJoint(Trait t){
if (!defaultJointExists)
return TREEUtils.JointFactory (t);
else {
GameObject G = Instantiate (defaultJoint);
G.name = "joint_" + t.id;
Joint J = G.GetComponent<Joint>();
J.setTrait (t);
J.setScale (t.jointScale);
J.joint = t.id;
return G;
}
}