Thanks for your responses gentlemens, but I already tried Fraps, it works, but Fraps doesn't support batch command (I asked to Fraps guys), and I need to encapsulate the video capture cleany in my app, to give the choice to the user to view the simulation as video file if his computer doesn't support 3d acceleration.
Such a feature exists in another 3dengine (
www.vertice.fr / Nova) and in Jade Engine.
Twin,