"Bald Eagle" <cre### [at] netscapenet> wrote:

>
> First, when I try to render the lemon {} object with the current parameters, I
> only get a very faint speckling rather than a well-formed surface.

The speckling was even worse for me.

By changing the camera to 'perspective' and with location <0,0,-.7>, I see the
nice lemon shape. Also, I don't see any difference re: sturm vs. no sturm.
>
> The other issue is that the isosurface seems to have the interior_texture
> on the outside, and the texture on the inside.
>

As an experiment, I negated your spindle function...
      #declare Iso =
      isosurface {
       function {-Spindle (x, y, z)}...

and the interior/exterior textures look correct now. A clue to something?

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