Like walls, each line of a roof baseline polyline contains roof directives that affect automatic roof generation.
Select any edge of a roof baseline polyline click the Open Object 
edit button open the Roof Baseline Specification dialog.
The first four checkboxes, Full Gable Wall, High Shed/Gable Wall, Knee Wall, and Extend Slope Downward are the same as the first four items in the Roof tab of the Wall Specification dialog.
Against Wall - Check this if the roof plane rising from this baseline butts against an exterior wall. This is similar to checking High Shed/Gable Wall.
The Pitch, 2nd Pitch and Starts at entries are the same those in the Wall Specification dialog. See "Wall Specification Dialog".
Pitch - Change the pitch for the selected roof plane baseline. This overrides the default pitch set in the Build Roof dialog. For a conversion to degrees, see "Roof Pitches in Degrees".
Baseline height holds the height of the baseline. This is the top of rafter height where it crosses the baseline. Changing the pitch or secon dpitch affects the line that was selected in the baseline. Changing the height affects all lines in the baseline polyline.
Check Display One Floor Up/Down for Editing to display the selected roof baseline on an adjacent floor. An upper or lower floor must be present to enable this option.
Click the Num Style button to change the way numbers display in the dialog. Changes made here do not affect the plan.
For information about the Polyline tab, see "Polyline Tab".
For information about the Selected Line tab, see "Selected Line Tab".
For information about the Line Style tab, see "Line Style Tab".
For information about the Fill Style tab, see "Fill Style Tab".
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