Be careful, though, with groups. If you create an empty group in the definition and then add geometry to it, you'll be okay. But if you try to create the group with specified geometry, your group will end up in the main model entities space. That's because in ruby, things that are impossible when drawing manually become (theoretically) possible, such as using FollowMe on a path outside the current entities space (will work), or creating groups inside of groups when you aren't inside the group to begin with (won't work). So, just be mindful when working with groups & nested geometry, that things may not happen the way you expect.

Thanks for the info. I can now recreate what you have done. I just draw a curve, and close it, no welding, the arc stays an arc. I then use extrude to create the surface and afterwards the texture works fine. What I was actually doing to create the extruded shape was rather different, and it might have something to do with it. I create an arc just as a guideline for a follow me. Then I create an Upright Rectangle, and follow it along the arc. The reason for this was of how my Ruby script work. I have to create a lot of components that follows basically the same curve, ie curved panels, with mouldings, etc. It seems that in that case, the resulting follow me creates the "segments" somewhat differently, and hence the texture problem. This might mean some rethink on my approach.

Hello Koos, I understand your concern about publishing your code. I'm sure you can help me in my other post. http://www.sketchucation.com/forums/scf/viewtopic.php?f=57&t=6543&p=41849#p41849 Maybe you could have a look there and put me on the rails? I'v solved some of my problems nut still have no idea how to put more text boxes in my form and retrieve each single variable into sketchup. I feel this : dlg.add_action_callback("ValueChanged") {|d,p| $avariable = p } is to short to do so because i can retrieve just one varaiable. Isn't it? Do not hesitate to reply in the other post so that I can end this one. Thank you Koos.