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3-d geometry is based on the same principle than 2-d geometry: a
subsession at the left and the representation in the
middle. Mouse interaction outside the representation will
change the viewpoint, inside the representation it will depending
on the mode: draw a point, a segment, ... according to the mouse
plan displayed above (all mouse clicks are supposed to refer
to this plan, which is perpendicular to the visualisation axis).
giac documentation written by Bernard Parisse