Hi All (Mostly @Vux I guess)
I tried out @antokhio))'s nice Rutt Etra example in this thread: ((forum:rutt-etra-effect
more precisely this patch: sites/default/files/user-files/pixel11.rar
and I played around with changing the Topology in Topology (DX11.Geometry) to see what it did and when changing it to undefined my whole computer froze, mouse and keyboard did nothing. no ctrl+del nothing. only killing the power and starting over worked to get the machine up again.