Line Conventions, Continued
At the intersection of a hidden and visible line, the hidden line will straddle
the visible line. If you draw the hidden line in contact with the visible line, it
implies that the hidden line is above, rather than below the visible line.
Figure 3-10 illustrates correct and incorrect procedures for drawing
Figure 3-10.Drawing intersecting hidden
When drawing the intersection of two hidden lines at different levels, the
hidden line representing the uppermost edge remains intact and the hidden
line representing the lowermost edge is split by the upper hidden line.
Figure 3-11 illustrates hidden edges at different levels.
Figure 3-11.Hidden edges at
Continued on next page