Subject: mp1

(This message is being sent to all CPSC 102 Sec 1 students )

Do not consider working on tplane until plane and sphere
WORK PERFECTLY.

You will need to add the tplane structure from the notes to
ray.h (if you do a tplane)

The notes had an error in the tplane_foreground() function
It should be:

   int tplane_foreground()

and NOT void.