...The overall simulation procedure (de facto a full 3D, an articulated-body simulaiton engine) is called:
"Lagrangian Dynamics' New Flavour Simulations".
It is delivered through sample-simulators relying on it.
The modified falvour of the Lagrangian Dynamics here proposed is also a bit simpler to use and to understand than the original one. Of course it is all based on finite-differece derivatives, both oridinary and partial.
The new flavour relies on my first theorem on Numerical Methods,and the 1 on numerical stability
Hope this piece of software will be useful to many. ...