ok, so i've been following sslt threads and was wondering why i get:

povray: render/trace.cpp:3525: void
pov::Trace::ComputeDiffuseContribution(const pov::Intersection&, const
pov::Vector3d&, const pov::Vector3d&, const pov::Vector3d&, const
pov::Vector3d&, double&, double, double, double): Assertion `(sd >= 0.0)
&& (sd <= 1.7976931348623157e+308)' failed.

when i have ior > 3.85 (3.85 works but not 3.86) is this and
unreasonable setting ... btw: was just experimenting and discovered this
accidentally (typo with decimal place) then I narrowed in on the fail
threshold

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