Curtis L. Olson wrote:
 > Andy Ross wrote:
 > > Actually, there needs to be a way to disambiguate the case where p1
 > > is actually below ground, too.
 >
 > It shouldn't be too hard to test that the resulting contact point is
 > between p1 and p2 ...

Yeah, that's one way to do it.  But, as I specified it, there isn't
any way to distinguish the case where p1 is below ground and p2 is
above, with an intersection point of "I" (which would represent a
crashed and inverted aircraft), and the inverse case where I is the
same, but p2 is below ground and p1 above (which is an airplane
sitting on its gear normally).

It's not a big deal, really.  I just discovered the ambiguity as I was
finishing the note and put that final bit in so someone didn't call me
on it. :)

Andy

-- 
Andrew J. Ross                NextBus Information Systems
Senior Software Engineer      Emeryville, CA
[EMAIL PROTECTED]              http://www.nextbus.com
"Men go crazy in conflagrations.  They only get better one by one."
  - Sting (misquoted)


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