Clipping of polygons partially outside hemisphere

Hi,

I just added a Stereographic Projection to Openmap by creating a new
Stereographic class. It appears to be very similar to Orthographic and
only required a few code changes for the way the coordinates are
calculated. It's also plotted on a sphere, similar to Orthographic.
However, when I zoom in on the Stereographic map, polygons that fall
only partially on the hemisphere are clipped from the map completely.
For some reason, it's not taking into account the partial polygons and
is not adding points that lie on the hemisphere edge in order to
complete the polygon like Orthorgraphic does.

Does anyone have any ideas as to why there is clipping for Stereographic
but not Orthographic? And how I can go about fixing this?

Thanks!
Karen

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