The Default Background Transition Distances for New Documents.
[Visual Basic .NET] Public Sub SetDefaultBackgroundTransitionDistances ( _ ByVal lowAltitude As Single, _ ByVal highAltitude As Single _ )
[C#] public void SetDefaultBackgroundTransitionDistances ( float lowAltitude, float highAltitude );
Product Availability
Available with ArcGIS Desktop. Requires 3D Analyst Extension.