I can not figure out how to use a rubber band joint in more than one axis. I want an arc between two objects to stretch and adapt as the objects it is attached to at either end move around. Is this possible?
I guess your problem lies with the orientation of the scaling (rubber band) axis.
In this sample Rubberband migilbride 001.3dm (481.9 KB)
the mutual movement between the 2 main objects is according to the x-axis. The IK chain consists of the sphere (main object) the ‘arc’ and a point-object to mark the end of the arc. The pivot of the arc is moved to its begin to assure its contact with the sphere. The end of the arc (the point) is constrained to the center of the 2nd sphere. This center is marked by a point-object (being child of the sphere), because when you constraint an object to the sphere itself it will stick to the surface of the sphere not to its center (after all a sphere is a surface). The arc is made rubber band axis X.
In Rubberband migilbride 002.3dm (542.0 KB)
it gets a little more complex because the spheres move in all 3 dimensions. Now the ‘arc’ has to gain freedom of rotation in order to adjust his orientation. This can be done by making the curve a universal joint, with rotation in all 3 directions and scaling along the X-axis (the original rubber-band).
I hope I grasped your enigma correctly. - Luc
Thanks. These are good examples. I think I can make these work.