Question: 3D postcript figure acuracy

I am exporting a 3D colored ps figure by using the output command: plotsetup(ps,plotoutput=`plot.ps`,plotoptions=`portrait,noborder,color=RGB`); Without changing the grid size, the figure, in the postcript file, appears with less accuracy than the one that would appear in the Maple environment. Is there an option to be defined that improves the picture resolution without the need of increasing the number of points of the grid?
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