Composite Developable Alternative Surfaces

Developable alternative patches is introduced as a choice in the design of developable surfaces. This paper extends the previous work by joining consecutive alternative patches subject to various continuity conditions. With a first boundary curve freely specified, 2n + 3, n + 4 and 5 DOF’s are available for a second boundary curve of a developable alternative surface containing n patches, when the surface is G0, G1 and C1 continuity, respectively. The composite surfaces are then evaluated by using highlight lines, which effectively in detecting surface irregularities.