We present an algorithm for completing a
C
2 surface of up to degree bi-6 by capping an
n-sided hole with polar layout. The cap consists of
n tensor-product patches, each of degree 6 in the periodic and degree 5 in the radial direction. To match the polar layout,
one edge of these patches is collapsed.
We explore and compare with alternative constructions, based on more pieces or using total-degree, triangular patches.