Sets the parameters for the refinement algorithm used in drawing
in the conformal model. CMX is the cosine of the maximum angle
an edge can bend before it is refined. Its value should be between
-1 and 1; the default is 0.95; decreasing its value will cause less
refinement. N is the maximum number of iterations of refining;
the default is 6. SHOWEDGES, which should be no or yes,
determines whether interior edges in the refinement are drawn.