Creating a Control Fence Automatically

Because a control fence is often associated with a pad or other type of site modifier, VectorWorks Landmark can create a control fence automatically around a site modifier, based on specific parameters. A control fence can be created with a gradual sloping transition from the existing site contours to the modifier, placed at a variable or fixed distance from the modifier. The control fence cuts and fills the site model to create a constant slope (batter slope).

To create a control fence automatically around one or more site modifier(s):

1.	Select the site modifier(s) which require a control fence. Valid modifiers include pads, road objects, massing models, and landscape walls.

2.	Select Landmark > Create Fence from Pad.

3.	The Create Fences from Pads dialog box opens. Select the control fence parameters.

 

Parameter	Description
Fence Offset Control
Distance	Creates a control fence at a fixed offset distance
Batter Slope	Creates a variable offset fence based on slope (the slope variation determines the offset; the fence is located at the intersection of the slope and the existing terrain)
Max. Offset	Sets the fixed offset distance for Distance offset control, or specifies the maximum offset distance allowed for Batter Slope offset control
Max. Slope	For Batter Slope offset control, specifies the maximum allowable slope (in degrees)
Slope Control Options
Use Midpoints	Enables additional testing points for a more uniform slope
Test Increment	Specifies the number of midpoints to test; a smaller increment distance increases the accuracy of the slope calculations, but can also increase the time to create the control fence (the minimum increment is 12”)

4.	Click OK to create the control fence.

5.	Select the site model and click Update from the Object Info palette.