Update.

Seems I was making things a lot harder than they needed to be. I also 
encountered further bugs. The new version of "Get_Screen_XY" is *a lot* 
simpler. The good news is that if you didn't have problems before (i.e. 
you were using "Set_Camera" and perspective projection instead of 
"Set_Camera_Alt" or orthographic projection), then you shouldn't notice 
a difference.

Mike

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