I've always been curious how Christoph did the stripes for the gamma
showcase image
  https://wiki.povray.org/content/File:TutImgGammaShowcase.png
but only now got around to looking at the code.  I decided to do a
walk-around animation to visualize the pattern.

For some reason, at camera resolution the striped impressions don't
match the solid color in the video.  They did match in the still frames
prior to encoding.  Because the stripes are initially at the camera
resolution, moire patterns are inevitable when the camera starts moving,
but these clear up as I bring the camera in closer to the spheres.

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Attachments:
Download 'gamma_showcase_stripes.mp4.dat' (4165 KB)