Early in the development of ∥-coords, the representation of surfaces was attempted by simply plotting the surface’s points as polygonal lines. Except for very special surfaces(i.e.,spheres,ellipsoids),thisturnedouttobeevenmorehopelessthanwhat happened with line-curves. The next improvement was the surface representation by the envelopeof these polygonal lines.
KeywordsCircular Cylinder Tangent Plane Ideal Point Developable Surface Surface Representation
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