Blending Canal Surfaces Based on PH Curves

In this paper, a new method for blending two canal surfaces is proposed. The blending surface is itself a generalized canal surface, the spine curve of which is a PH (Pythagorean-Hodograph) curve. The blending surface possesses an attractive property --- its representation is rational. The method is extensible to blend general surfaces as long as the blending boundaries are well-defined.