It appears that intersecting a solid mesh with an isosurface doesn't work
properly...is this a known issue, or am I doing something wrong?

I've attached images showing the result of the same solid mesh with an
isosurface (on the left) and a simple spherical shell created by taking the
difference of two spheres (on the right).

You can see on the right side the mesh object appears solid, but on the left
(isosurface) side, it appears hollow...is this just something I'm not going to
be able to do?

Here's the code for the isosurface intersection:

#declare iso_ =
isosurface {
  function{
    x-f_snoise3d(x, y, z)*5
  }
  contained_by { box {<-10,-10,-10>, <10, 10, 10> } }
  accuracy 0.003
  max_gradient 12

  pigment { color Red }
  finish { ambient 0.5 }
}


intersection {
  object { skull_ scale 5.0 }
  object { iso_ }

  translate 10*z
}

And the code for the spherical shell intersection:

intersection {
  object { skull_ scale 5.0 }
  difference {
    sphere { <0, 0, 0>, 4.8 }
    sphere { <0, 0, 0>, 4.2 }

    pigment { color Red }
    finish { ambient 0.5 }
  }

  translate 10*z
}

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Attachments:
Download 'meshintersect.jpg' (167 KB)

Preview of image 'meshintersect.jpg'