AlexPolo,

I am not sure I understand you.

I need to remind you again: please do not use the curves you sent to me in production. The wireframe is heavily overlapped and twisted. XNurbs has to downgrade surface quality and waste a lot of control points to handle these curve constraints. In your wireframe, for two connected points at a corner, one point is actually 5 mm above the other – very bad conflict constraints! Your screenshot shows XNurbs generates dense control points at the four corners – it indicates problems in your input. We are looking for some bad samples, e.g., heavily overlapped/twisted constraints, and your example is perfect for us. Thank you. However, if you were a designer, I don’t know why you also need such an example.

Kevin