Chapter 4 - Normal Surfaces in Orthographic Projections

Example 4-5

(Next look at hidden surface (13,14,17,18))

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Line (42,31) is the edge view of hidden surface (26,19,20,21,22,23,24,25). Projection gives line (A,B). Line (40,33) is the edge view of the bottom surface (1,4,5,6,19,17,14,13,9,26,11,12). Projection gives line (C,D).