Warp <war### [at] tagpovrayorg> wrote:

> to choose the mipmap is the same as with scanline rendering). Perhaps the
> total length of the rays traced so far for the current pixel could be a
> good heuristic...

I don't think so. It would be correct for a reflection on a plane, but 
totally wrong for a reflection on a small sphere.
To make it correct the 'width' of the ray would be needed, and to 
calculate (an approximation of) this, the curvature of the reflective/
refractive surface at the intersection point would be needed.

Lutz-Peter

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