Mark Birch <las### [at] hotmailcom> wrote:
> 1. Coincident surfaces - if you stack one box *exactly* next to the other
> then Povray won't know which surface to render.  Sometimes it will render
> 'Box A' and sometimes it will render 'Box B'.  This isn't a problem if the
> textures on 'Box A' & 'Box B' are exactly the same, but if they are
> different you will get random per-pixel speckling where the surfaces
> overlap.  Simple solution is to leave a very small gap between the two
> objects.

  This might actually not be the case with axis-oriented boxes because
the math involved is very straightforward and predictable.
  It's still safer to leave the gap, though.

-- 
                                                          - Warp

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