Skewed and Falling Lines

By default, skewed and falling lines are showed by 3D skewboxes (that is one skewbox to show the fall and one to show the horizontal skew).

Skewed and falling lines with falls less than the current fall limit can be shown by an arrow on the pipe showing the direction of fall, and the word FALL followed by the amount of fall. A single (2D) skewbox shows the horizontal skew in this case. See the FALLSKEWS command.

The user can also suppress skewboxes showing falls for branch legs which have less than a given number of components.