Invisible wrote:
> Have you ever spent an entire day working on an important problem, 
> finally thought you had it solved, and then discovered that actually it 
> wasn't solved at all?
> 
> I hate days like that...
> 

Yesterday, actually.

I've spent the last month working on the code for a large art piece, the 
design of which called for some motion detection which caused the 
creatures in the piece to migrate towards the viewer. Can't actually do 
mo-cap, and the critter's movements would get picked up, can't move the 
camera because it would get flooded by the other projectors in the room. 
So, we put it right over the screen, which is parallel to the floor and 
on a little stand. Hand moves over the screen, the dark shadow moves the 
little buggers.

Then someone gets the bright idea to make the back ground of the screen 
dark.

I've 'fixed' the problem with detecting dark shadows against a black 
background with so many different kludges the past few days. All of them 
worked for a few minutes, until several people got near the display, or 
stray light entered the room, or the other displays in the room got 
turned on.

Finally, someone listened and made the background lighter again. The 
first solution works again.

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