@wimvdb : I think the error message is that you have pressed a button that asks that some vertices are selected. Your vertices selection was certainly empty. I thought having verify all buttons, some buttons have apparently escaped to the control. Could you tell me in what tab, this problem appeared? Resetting the current simulation is not active, currently. When I started writing the program, I told myself that it might be as a Poser's function. We were doing a simulation that was transferred to Poser, the program closes, then we re-open the program to launch the next simulation. This is what happens when everything works fine. When we want to change a simulation in which we have already introduced parameters, the problem becomes more complicated. There are a large number of arrays that are filled. I wanted to make a fast reset of a simulation but this caused inconsistencies in the program. It is a function that I would write soon.

I did a lot of tests, but it is certain that some bugs will appear. Please, be indugent. I promise you that a program like this is not easy to write.
Concerning the speed of the simulator, you will see that it goes fast, but, in addition, remember that the animation informations are totally unknown to him. To compare with the Poser's simulator, you must:
    - use the second simulation which use the same animation,
    - record the current animation by pressing the "record" button in the "Collision parameters" tab.

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