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The noise function used in POV-Ray 3.1 results in
"plateaus" which sometimes leads to unwanted results.
Therefore two alternative noise generators have been introduced,
controlled with the noise_generator keyword. Adding
noise_generator TYPE
to global_settings{} specifies the desired noise function
globally, or you can use the same keyword after any pattern to select a
noise generator just for a single case. The default generator is type 2
You can choose noise_generator 1, which behaves
like the noise in POV-Ray 3.1 and earlier, or noise_generator
2, which is a version of type 1 squeezed down into a smaller
range to prevent the plateaus. The generator type 3 is a completely new
Perlin noise function.
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