You quoted text that I haven't wrote... You spelled my name wrongly... You are posting gibberish code examples... If you say that my code is not good and helpful, then show us your version in ALISP format - real *.lsp... I am not saying that my version is the best, I showed examples where it won't give results, but I also showed solution for ultimate roof and solution based on my algorithm that differs from built-in offset algorithm... So if you have something useful, we'll be grateful to see it, otherwise I must say that you are spamming this topic that is IMHO very profound and well composed...