Wasn't it Ruy who wrote:
>I don't know what I'm doing wrong with this scene. I created an isosurface
>(the same you can see in the previous animation I posted) and differenced
>half of it from a plane.  When observed from sideways the result looks fine,
>but as I rotated it, a large white area appeared. Well, an animation with 60
>frames is woth 60000 words, so go ahead and take a look.
>
>If someone knows what I am doing wrong, please tell me. Oh, and if it is too
>obvious, feel free to nag me from here to Kabul.
>
>Here is the scene. It uses Ingo Janssen's "param.inc":

When you use Ingo's "param.inc" file, it converts your functions into a
*mesh2* object rather than an actual isosurface. Mesh2 objects can't be
used in differences.

The docs say:

   There are six totally thin, finite objects which have no well-defined 
   inside. They are bicubic patch, disc, smooth triangle, triangle, 
   polygon and mesh / mesh2. They may be combined in CSG union but 
   cannot be used in other types of CSG (or inside a clipped_by 
   statement).

-- 
Mike Williams
Gentleman of Leisure

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