Hi Pilou!

Thanks for the tipp with sketchup, i will try it also.

Now I made my first steps with the nodeeditor. I got my movement.
But it'll still be a long way...

I couldn't rotate the entire seat, which consists of several bodies, by selecting by name at once.
The seat that has to be turned consists of the following bodies: "Eisen", "pp", "Schraube links", "Schraube rechts", "SitzRahmen".
Previously I had all only named "Sitz", but it was not possible to rotate in one movement.
I had to create a name and rotation for each body, but all on a slider.
Besides, I was only able to turn around "rX" (for me x0). I haven't found out how the rotation axis could be moved.
But a start has been made...
Regards,
Franz