Gray code scanner calibration

[Андрей Золотин]

Hi!
I have just tried out this awesome GrayCode scanner software for processing: https://code.google.com/p/structured-light/source/browse/#svn/trunk/Processing/GrayDecoderDemo
But the result was very bad(i saw much better results on the web)
So the question is if i need to calibrate the camera and the projector?(or it is not obligatory?)
And where is it better to place the camera/projector?
Best wishes,
Andrey