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The 3D distance from the observer to the hit point.
[Visual Basic .NET]
Public Property DistanceToObserver As Double
[C#]
public double DistanceToObserver {get; set;}
[C++]
HRESULT get_DistanceToObserver(
  double pDistanceToObs
);
[C++]
HRESULT put_DistanceToObserver(
  System.Double* pDistanceToObs
);
[C++] Parameters pDistanceToObs [in]
pDistanceToObs is a parameter of type double pDistanceToObs [out, retval]
pDistanceToObs is a parameter of type double*