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TRACE { OFf | ON }
TRACE is
ON for line-drawing plots
(DRAW
and RDRAW ),
the path between the point to be plotted and the viewpoint is
checked for obscuring opaque zones. If the point would be hidden,
it is not plotted. The default mode is
OFF.
The current setting is reported if no argument is given.
Meaningful for line
DRAWing mode only.