Dave Blandston wrote:

> Or some other method?

I wonder if the aoi pattern should be extended
to support an absolute direction vector which is
then compared to the incoming ray (ignoring the
surface normal). Then the complete appearance of
the sphere can change depending on the viewpoint
(in particular it could become invisible).

The current aoi pattern is not very helpful here
as every viewpoint sees points on the sphere at all
angles from 0 to 90 degrees.

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