Subdivision modeling method in net shell design

The traditional complicated shells design of architecture applies mathematics lofting on the base of experience formula. The method is complicated, which result curve has no unambiguous implication. The traditional single aperture mesh modeling, which generally applies Delaunay triangulation, has difficulty in interaction control. A mixed subdivision modeling of single aperture mesh is represented in this paper. The method has an unambiguous implication with 3 cluster curve which is C² continuous after fairing. The method is a completely simple one without constructing and solving equations. The example of British Museum shell design show the great flexibility advantage of mixed subdivision design method in net shell architecture.