ABSTRACT

It is a frequent problem in Computer Aided Design systems (see [8,11] for several examples) to represent a given B-spline curve x(t) of arbitrary order A; as a B-spline curve x(£) of any prescribed order k by applying suitable methods for basis conversion. The same task naturally appears for tensor product B-spline surfaces if the polynomial order has to be changed from (fci,fc2) to (fci,fc2).