I want to set up a texture map across the cross section of an object. I
want "something" in the center, and absolutely nothing at the surface.

(The context is that I want to use the noise3d function, but want
something skinnier than my current surface: a tree trunk for the trees
in my garden!)

Using the following code, I can distinctly see where the surface of the
"Clear" areas are.  How do I fix?


#declare trunk=
//union{
isosurface {
         function {noise3d(1/fact*x,1/fact*y,1/fact*z)}//dustspecs
                accuracy 0.01
               threshold 0.10 //.08 and 0.09 looked cool. keep 0.15
                bounded_by {
                           box{<-boun,-3,-boun>,<boun,10,boun>}
                           }
        //pigment{Red}

        texture {
                function {noise3d(1/fact*x,1/fact*y,1/fact*z)}
                texture_map {
                             [ 0.00 pigment {Brown}]
                             [ 0.010 pigment {Brown}]
                             [ 0.011 pigment {Clear}]
                             [ 0.940 pigment {Clear}]
                            }
                }

    }

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