Returns the element id of the level that defines the bottom of the underlay range.

Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 17.0.0.0 (17.0.1090.0)
Since: 2017

Syntax

C#
`public ElementId GetUnderlayBaseLevel()`

Visual Basic
`Public Function GetUnderlayBaseLevel As ElementId`

Visual C++
`public: ElementId^ GetUnderlayBaseLevel()`

If InvalidElementId is returned, then the underlay base level is not set and no elements will be displayed as underlay.

See Also