Mike Williams wrote:

> 
> What does your code produce if you just add "no_shadow" to your
> isosurface? 
> 
> For your cylinder code, adding "no_shadow" clears up the artefacts, but
> that would look wrong in a real scene if there was something below the
> object onto which a shadow would be expected to be cast.
> 

Oh,...that does seem to work!  Thanks Mike.  The thing is "no_shadow" 
has to be directly in the isosurface { } block.  In my test that didn't 
work, I was applying it in an object wrapper.  A few hours sleep will do 
wonders. ;)

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