some objects (cable, rope, chain) can be deformed but not stretched.
Springs are designed to deform in one direction.
Simulations of humans
As I have said already I think that simulations of humans is so important. When joints bend we need to model the stretching of the skin.
The work of VRML Humanoid Animation Working Group at: http://ece.uwaterloo.ca:80/~h-anim/ does not seem to explain how to do this? perhaps I have missed something.
I can think of several possibilities for this:
- Have a zone around the joint where coordinates are transformed in proportion to their distance from the joint.
- Properly model the muscles, fat, tendons and other tissue.