There seems to be a problem with filtering objects, filter is treated
like transmit. I haven't downloaded the bug-fixed version yet, but this
seems to be unrelated to that bug.
For example, this:
sphere {< 0, 0, 0>, 1
  pigment {color Green filter 1}
 translate < 0, 1.0001, 0>
}
is invisible when placed on a ground plane, when it should show up as a
green transparent sphere.
This happens with #version 3.1 but not with #version 3.14159, I don't
know if it happens in UVPov.

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