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specify whether datum curves should be included for hidden line calculations.
yes*—datum curves are included when calculating the display of hidden lines. blanking and unblanking datum curves on a drawing will cause hidden lines in views to be recalculated.
no—datum curves are not included when calculating the display of hidden lines. blanking and unblanking datum curves on a drawing will not cause hidden lines in views to be recalculated. when using this option, datum curves will be displayed in wireframe.
note: hidden lines are initially calculated for all views when this configuration option is changed. this ensures that the display of the drawing remains stable when saved and retrieved. subsequent blanking and unblanking of layers containing only datum curves will not force hidden lines to be recalculated.