>      tolerance 0.9


Higher tolerance produces worse results. 0.9 is *huge* for a tolerance
value, especially when your radius is 0.1. Try something more like 1e-6 or
just leave the default.

When tolerance is so high, it's very possible that the sphere sweep thinks
that it's in its own shadow, which would cause it to be dark.

Of course, make sure you have a light source, too. =)

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

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