I'm attaching the scene file from the povr fork, but I'm 90% sure the
method used will work for v3.7 and v3.8 official releases - if the povr
inbuilt function 'f_range2range()' is replaced with whatever the SDL
coded version is that is shipped with official POV-Ray releases. The
name escapes me at the moment.
Image on top is 'wrinkles' with noise_generator 2 and on the bottom with
noise_generator 3 - FWIW.
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Download 'histogram.pov.txt' (4 KB)
Download 'histwrinklesnoise2an3.png' (11 KB)
Preview of image 'histwrinklesnoise2an3.png'