> falloff 90

That's what's doing it. Use falloff 89.999 and it works right. There's
probably some angle-related calculation going on internally which doesn't
have good results with 90 degree angles.

By the way,

>           confidence   0.95
>           variance     1/256

You can remove those lines. Confidence and variance are only used for
sampling method 1.

 - Slime
 [ http://www.slimeland.com/ ]

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