Figure 6

Shape modification of piecewise generalized Bézier-like surfaces with G ² continuity in the v direction. (a) \(\lambda _{1}= \lambda _{2} =1\), \(\gamma _{i,1} = \gamma _{i,2} =1\) (\(i=0,1,2,3,4\)); (b) \(\lambda _{1}= \lambda _{2} = 1\), \(\gamma _{i,1} = \gamma _{i,2} = -1\) (\(i=0,1,2,3,4\)); (c) \(\lambda _{1}= \lambda _{2} = 1\), \(\gamma _{i,2} = -1\) (\(i=3,4\)), \(\gamma _{0,2}= \gamma _{1,2}= \gamma _{2,2}= \gamma _{i,1} = 1\) (\(i=0,1,2,3,4\)); (d) \(\lambda _{1}= \lambda _{2}=1\), \(\gamma _{i,2}= \gamma _{4,1}= \gamma _{3,1}= \gamma _{2,1} = 1\) (\(i=0,1,2,3,4\)), \(\gamma _{i,1} = -1\) (\(i=0,1\)).