You have discovered one of the famous "behind glass" raytrace
bugs that have ALWAYS plagued Imagine. You also cannot get a glass
attribute inside a glass attribute object to render! There is NOTHING
you can do but try to fake the effect (i.e. wrap a brushmap around your
sphere to imitate the sourroundings,maybe a global brushmap would work?)
A possibly solution is to copy your glass tube and scale it
slightly smaller or larger so you get a double-walled tube. You have to
use a global map and an animated chrome spheres going up the tube. They
all reflected the global map correctly.
So, what you should do is to make the glass-tube have both an
inner AND an outer wall (make two tubes, one slightly smaller than the
other and join them to a single object). Then put your chrome ball
inside.
The secret is that the ray has to travel trough two (2) faces
with glass-attribute-settings (or any other transparent material for
that matter).
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