-- Regards. gustavo halperin _________________________________________ Laboratory for Computer Graphics and CAD Faculty of Mechanical Engineering Technion - Israel Institute of Technology Haifa, Israel 32000 Tel: 972-4-829-2334 Fax: 972-4-829-5711 e-mail: gustavoh@tx.technion.ac.il <mailto:gustavoh@tx.technion.ac.il> _________________________________________