Here is an image for a post I submitted where I have two superposed boxes with
different refractive indices.  The bottom region should be clear and the top
liquid should be a translucent yellow.  At the top of the upper region there
seems to be a weird line.  Also, there are weird triangles formed.  I do not
think these are all real.  I have overlapped the two regions a tiny bit and
used the merge operator (this seems to work the best).  I also have the bottom
region intersecting a plane (the floor) at the bottom to make things look
better (as from previous advice from this forum).  I have turned diffuse and
roughness to zero to try to mimic real life (they are supposed to be liquids),
but playing with them did not seem to fix the artifacts anyway.  I have posted
the code in the general section where I have reposted the problem.

Any Ideas,
Mike

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