In p.u.p,  we were discussing options for getting a plateau-free noise
function for pov.  I was experimenting with the pattern-based pigments
in isosurfaces and wonder if I found something in dents.

The "dents" pattern below almost looks plateau-free, although not
exaclty "smooth" as the ideal function I'm looking for would have.
"Bumps" has plateaus.  So how are dents and bumps different?  (Posting
same text to p.u.p).

//           switch to                         DENTS here
#declare yikes=function{pigment {bumps scale 30}}
#declare funk=
isosurface{
        function{
              y/100+yikes(x,y,z)/2}
              sign 1
              accuracy 0.01
              threshold 1
           clipped_by
           { sphere{0,250}}
        }



object { funk  pigment {Red + Green/3} finish {ambient 0.2}}
camera { location  <0,400,-750>  look_at <0,10,0>  angle 40//35
}
light_source{<-40,4000,-50>rgb 1.2}
light_source{<2000,0,-1135>rgb .2}

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Attachments:
Download 'bumps42.jpg' (32 KB) Download 'dents43.jpg' (28 KB)

Preview of image 'bumps42.jpg'

Preview of image 'dents43.jpg'