Leonardo wrote:

>Anyone come up with a solution / idea / sugestion?

Couldn't you try applying a well-chosen normal pattern to a simple thin box
(aligned with the bullet but facing the camera as far as possible) with a
single ior? I also had this variable ior problem a long time ago, but
controlling the refraction with a normal pattern or more directly by
choosing an appropriately shaped object proved faster and didn't have the
max_trace_level problem. I've used this to generate "heat-wave" type
distortions in a horizon line and simulate odd lenses.

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