When I try something like the following example I get speckles(or worse)
all over the isosurface. It happens when I add sine_wave or any other
wave type in the pigment  statement. Bumping the max_gradient to the sky
doesn't seem to help it, either. This limits what can be done with the
pigments, obviously. Other than that., the new pigment+isosurface
feature rules!

#declare P=function{pigment{radial sine_wave frequency 8 color_map{[0
rgb 0][1 rgb 1]}}}

isosurface{
 function (x^2+y^2+z^2)+(P(x,y,z)*.5)
 method 2
 max_gradient 10
 threshold 1
 sign 1
 pigment{rgb 1}
}

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