With povr, in addition to quilted, I've taken dents back to a normal 
perturbation only pattern.

What was the dents scalar value for maps pattern in POV-Ray was noise 
cubed. I've kept the pattern, but renamed it noise_cubed.

I've also renamed the previously created povr f_dents() inbuilt function 
to f_noise_cubed(). In looking at the inbuilt function again, I got to 
playing around with alternative noise shaping methods.

One of these is used for the raised bits on an isosurface plain in the 
attached image. The updated quilted normal perturbation pattern is 
applied on top on the shape.

Bill P.

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