Luis, Project going forward (but backward) quite well! The progress is a simple but workable interface and the new problem is that most projects give the expected results while others seem to produce rotations in more than one axis though only one was requested. That may have something to do with project origin and translation as 'new' projects have been OK. A question: Your original posting was about 'front' and 'side' views using (1, 0, 0) which seems to be giving me rather 'front' and 'top' -- I'd like to set the default to what you are most using. Could you perhaps post a pair of rotation tags <x, y, z, phi> and <x',y',z',Alfa> that you have produced so that I can double check my maths? BTW I'm going cross-eyed quite literally checking out the stereo pairs. A new projects will be color prints mounted for viewing in an antique stereopticon. Thanks, Carl Yahoo! Answers - Get better answers from someone who knows. Try it now. ___________________________________________________________ Yahoo! Mail is the world's favourite email. Don't settle for less, sign up for your free account today http://uk.rd.yahoo.com/evt=44106/*http://uk.docs.yahoo.com/mail/winter07.html