Edit a Region Split

You can edit the surface material of a road or yard area added to a terrain as follows.

Select the edge line of the area in the drawing.
Right-click to open the context-sensitive menu.
Select Properties.
The Add Region Split dialog box opens.
Select a material for shading and model visualization for the region surface from the Material to region list in the dialog box.
Add Region Split Dialog Box
Confirm by clicking OK.

Note:

You can edit the terrain model by deleting the rest of the terrain around the selected region. Only the selected area will remain of the terrain. Select the Delete outside region checkbox in the dialog box.