My thought was that if the MAX value is too low, we can just return 1.0 / dist for all dists, avoiding any further processing.  But I see what you mean.  It could still throw a fit if the lower values are too low.  I'll fix it.

The results are definitely a bit imprecise.  I I'm wondering whether there's theoretically any hope of finding a more precise method, even if that precision still falls short of the ray-casting results.

===========================sigline======================================================

Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.