After trying out some complex forms I thought it better to start with simple forms to get grip on this handy program.
So I started with a cube and tetraeder and that worked well.
My cylinder doesn't come out.
So I assured myself the points were on grid, used noesis to convert it again, as my *.obj files didn't seem right.
What I tried looks like a cylinder, but I needed the spikes method, otherwise there were some blended side patches and the form was not editable in quark.
Now it has the form
but the patches are glued inwards.