Labeling Line Drawings with Hidden-Part-Draw for Curved Surface Objects
Dong Li-jun · Journal of Engineering Graphics · 2006
A new labeling theory and method are proposed for the line drawings with hidden-part-draw for the three-dimensional manifold curved surface objects with trihedral vertices.Some rules for labeling are established.There are 69 kinds of possible junctions for line drawings,including 8 kinds of junctions for Y type,16 for W,11 for S,and 34 for V.By labeling line drawings for curved surface objects,two things can be judged: one is whether the projection of curved surface objects is manifold;another is whether the line drawings with hidden-part-draw is correct or incorrect.This labeling method can also be used for planar objects.The given sample shows that this proposed labeling method is correct.