Abstract
The paper reports the progress of an SERC sponsored project on recursive subdivision over arbitrary topologies. The limit surface is generally a standard B-spline surface except at the so called ‘extraordinary points’ where, it is reported, tangent plane continuity can be guaranteed and discrepancies in the curvature can be confined to 10% or less. The optimal subdivision procedure is currently being implemented in a designer-oriented form in collaboration with CADCentre Ltd Cambridge.
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