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| ArcObjects Help for .NET developers > ArcObjects namespaces > 3DAnalyst > ESRI.ArcGIS.Analyst3D > Interfaces > I3 > I3DProperties Interface > I3DProperties.BaseSurface Property (ArcObjects .NET 10.5 SDK) | 
The base surface.
[Visual Basic .NET] Public Property BaseSurface As IFunctionalSurface
[C#] public IFunctionalSurface BaseSurface {get; set;}
[C++]
HRESULT get_BaseSurface(
  IFunctionalSurface** ppBase
);
[C++]
HRESULT putref_BaseSurface(
  IFunctionalSurface* ppBase
);
[C++]
Parameters ppBase [out, retval]
ppBase is a parameter of type IFunctionalSurface ppBase [in]
ppBase is a parameter of type IFunctionalSurface