Return a copy of viewpoint with every positional value moved by offset
(IFC Z-up, same units as the viewpoint). Pass the frame's offset to go from
the shifted frame to world coordinates; pass its negation to go back.
Returns viewpoint itself when the offset is zero.
Return a copy of
viewpointwith every positional value moved byoffset(IFC Z-up, same units as the viewpoint). Pass the frame's offset to go from the shifted frame to world coordinates; pass its negation to go back. Returnsviewpointitself when the offset is zero.