Ron Parker <ron### [at] povrayorg> wrote...
> By the way, one side-effect of this is that POV seems to trace too many
rays
> for some scenes.  The following scene traces three rays per pixel (one eye
> ray plus one transmitted ray for each of the plain textures in the
> interpolation.)  I suppose you could call that a bug.

Not totally a bug.  If each layer has a different normal & the interior has
an IOR, you'd want it to use different rays.  An optimization would be to
re-use the result from a refraction or reflection if the previous layer
already shot it.

-Nathan

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