I think of Draftsight as a 3D program that's been artificially limited to 2D-ish.
I have been able to generate simple 3D blocks by extruding polygons in model space. I cannot do Boolean operations on them, like subtracting a cylinder from a block. I cannot extrude a region, e.g. a square with an inscribed circle, to produce a block with a hole through it.
I have not been able to rotate the PS viewports to see a side of the 3D model other than what the default is, e.g. top view.
I haven't tried using it, but the draw menu includes a 3D polyline selection.
I.e., it's just good enough at 3D to be annoying.
Mike Halloran
Pembroke Pines, FL, USA