World Coordinates -> Screen Coordinates

[Michael Gleicher]

Does anyone have an easy way to get from worldspace co-ords to screen co-ords?
(basically do a mapw2 in reverse).
I need to do this to use the select routines.

I should be able to grab the matrix off the stack and run my point through it,
although, although I remember reading somewhere that there was an extra trick
to really making it work.

I appreciate the help.

	Mike