I have created two isosurface regions with a sine wave pattern.  They are
supposed to be two clear liquids in a tank.  They will have different
refractive indicies.  To test it, I have been trying to put the same refractive
index and the sine wave pattern should disappear.  It does not disappear
however.  And the visible "weird" pattern is a lot larger than the .0001 space
I have left between the regions (I have also tried doing a merge operator, but
I still cannot make the pattern vanish as it should with two regions with
identical properties).  I am aware that since I am rotating the pattern to
create the top region that I must account for this.  I have tried to, but
perhaps I have done it wrong; I have tried many possibilities actually.  The
code is in the general forum.

I have posted three images.  The zoomed in front view is of the test case I have
posted where I have a tiny space between the two regions.
The other two images are (front view and 3-D view) where I have actually used a
red LED backlight, more complex interface and actually used the merge command
with a tiny overlap (2.9999 changed to 3.0001).  In all cases the interface
should be invisible since they are the same liquid (same IOR and transparency),
but they are not.

Thanks,
Mike

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