Martin Magnusson wrote:
> As far as I can see, there should be a smooth transition between the two
> boxes. Can someone explain where the gap that shows in the image comes
> from? I have also attached a scene file that renders this image.

Perhaps POV is interpolating values outside your density. It may be 
treating everything outside as 0 and smoothing white values to black 
ones. Try adding a border around your density so that black areas abut 
black, and white areas abut white.

Sam

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