Похоже нет, не поняли. Активный вид - doc.ActiveView
Parameters
document
Type: Autodesk.Revit.DB.Document
The document that owns the view.
viewId
Type: Autodesk.Revit.DB.ElementId
The view id.
Remarks
Elements that will be passed by the collector have graphics that may be visible in the input view. Some elements may still be hidden because they are obscured by other elements.
For elements which are outside of a crop region, they may still be passed by the collector because Revit relies on later processing to eliminate the elements hidden by the crop. This effect may more easily occur for non-rectangular crop regions, but may also happen even for rectangular crops. You can compare the boundary of the region with the element's boundary if more precise results are required.
Accessing these visible elements may require Revit to rebuild the geometry of the view. The first time your code constructs a collector for a given view, or the first time your code constructs a collector for a view whose display settings have just been changed, you may experience a significant performance degradation.