The Picker
Needs little explanation, the mouse picker used for object selection.
3D Object Picking is always done in the 3D window.
2D Object Picking is always done in the 2D windows.
This convention means we do not have to have selection (2d and 3d sensitivity) controls for picking. For example in Plan View it is possible to select 2D lines through 3D objects without any conflict of objects.
There are exceptions to the above rules.
1. Polygons pasted into Elevations are also selectable in the 3D view. This is needed for Roof trimming and can also be useful when extruding objects.
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