Options for specifying which crossings are computed and displayed in the 2D Graphics window

Member	Value	Description
eAltCrossingUnknown	-1	Unknown.
eAltCrossingBothSides	0	Both Sides - if the Direction option for altitude crossing permits front and back crossings, both are computed and displayed in the 2D Graphics window.
eAltCrossingOneSide	1	One Side - only the first crossing that satisfies the Direction option for altitude crossing is computed and displayed in the 2D Graphics window.