1) What are your media settings?

2) The "intervals" keyword may be interpreted differently with and
without the plane.  POV figures out how to sample the media by splitting
the ray into a certain number of intervals inside the media.  IF the
media isn't contained by an object, then the intervals are calculated
based on the distance to the first intersection.  So, the plane might
make a difference there.

3) otherwise, I'm stumped.

- Ben

Post a reply to this message