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Discussion of Problem 1436. Billboard

Addition to the problem description
Posted by LSBG 13 Dec 2008 22:17
I don't keep much hope on somebody looking in the discussion section for this problem with all that time passed after it's introduction but I would like to make the note that the view point  should be with non-negative x coordinate. This is not clear from the problem statement. I still haven't passed the whole problem but adding this logic to my solution upgraded me from wa8 to wa9. Any other tricks someone has noticed?
Re: Addition to the problem description
No, view point may have negative x coordinate, so there should be another reason for your advance from 8-th to 9-th test...