Try adding something like this to your mesh object:
inside_vector <0, 0, 1>

In MegaPov, this will instruct MegaPov to treat this as a solid mesh.  Be
aware that the algorithm that computes mesh insidedness is flawed, but it
does work most of the time.  Read the docs (section 5.3) for more
information.

-Nathan

ryan constantine <rco### [at] yahoocom> wrote...
> what i want to do is intersect a mesh2 object with a box (hoping it will
> make a solid).  is it possible?  i'm using megapov 0.4, but i still get
> an error telling me "patch objects not allowed in intersection".  it
> does look right, but when i cut a piece out to see if it is solid, a
> hole in the surface is cut, and the inside is the color of the
> background.  does that mean that only the outer surface of a mesh2
> object is visible?  TIA

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