Select an existing roof using the
Element Selection tool.
Notice the vertical arrow glyphs that appear
on the ridge lines.
The set of Arrow glyphs is used to modify ridge
height.
Select the arrow glyph for the ridge line to be modified.
The AccuDraw compass appears and the ridge
line is dynamic on the pointer.
Move the ridge line to the desired elevation and enter a data
point.
The new ridge line is placed and all adjoining
roof surfaces and edges are modified to suit.
Use the Element Selection tool to deselect the roof.
