Hello friends ! Well, I´m testing the birail tool again - and I think it´s really wonderfull, cause there are sooo many possibilities. But now I have again a little problem. If I want to use the birail 3+ tool, I get the follwoing error message: // Error: mpBirailSrf3 (Mp Birail Srf Node): birail surface computation failed // // Warning: You have an empty result since history is on. You may want to undo the last command. // // Result: multiProfileBirailSurface3 mpBirailSrf3 // // Error: mpBirailSrf3 (Mp Birail Srf Node): birail surface computation failed // Hmm, I don´t know what I did wrong, or what I can do to avoid this error. Here is a little image from my simply ep-curves: and here is the maya file: https://www.tophunter.at/3dproblems/spitfire.rar Thx for every little help, bernhard