@ntxdave said: Depending on what you want to do, you could look at TIG's 2D Tools plugin but there are some restrictions on how you use it. sure it depends on what I need to do... It was a 2D drawing for clarity. Well, I know that SU isn't primarily focused on that. It's about understanding and acceptance of philosophy. thanks for all the responses guys greetings Peter

nice advice, even I have to add some other object (1line) book too thx a lot

If you've used SketchUp at all, you'd know that curved surfaces are represented by by small facets. Just as arcs and circles are represented by a series of line segments. You can't get around that. On the other hand, it shouldn't be a problem in rendering if you've made it correctly. If there are internal faces, you'll have problems. For example, here's a ring drawn in SU and rendered quickly in KT. [image: 6318648290_530026a3b2.jpg] No visible tesselation despit the fact that the surface is made of small quadrilateral faces in SU. [image: 6318128569_6e28da4fd3.jpg] Have a look through the Gallery here. You can find any number of examples better than mine. It is like any other computer related stuff, though. Garbage in, garbage out.