The direction towards the viewer.
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 25.0.0.0 (25.0.0.0)
public XYZ ViewDirection { get; }
In orthographic views, all objects are projected onto the screen along this direction. In perspective views, the view target point is projected along this direction, but other points are projected towards the eye along different vectors.