Quote:
Originally Posted by Wavytone
So how does one single fabric screen produce fringes that are clearly a contour map of the horses anatomy, similar to what an interferometer would produce ?
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The single fabric screen is casting a shadow of itself on the horse. The shadow acts as another 'screen', and because this shadow screen is not on a flat surface, there are variable moire effects which act to show the horse's contours.
This was one technique used in medical and other technical photography work before laser scanners were invented.