Great, I thinked about something similar some time ago.
But why don't use curved rays for tracing primarilly a only for those
objects,
which don't suppory intersection with spline (for example) use spline
interpolation by straight rays? Those objects will be all of POV objects
at the beginning, but in the future some of them can support
intersection with curved rays.

Just an idea, I don't know, if exists mathematical solution of
intersection between spline and sphere, for example.

Disnel

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