> To do this *right*, I'm thinking you'd have to do a full-blown physics
> simulation. But, I'm wondering if we can't get to a reasonable approximation
> with some extra trace checks. Right now, it's only checking straight down from
> above, but if we also checked across from the center point, maybe we could
> eliminate points that didn't have a straight path from here to there. I
> experimented with that idea some but I can't tell if it's really working yet.
>

Or, I suppose it could be as simple as what paint programs do with the fill
tool, and treat it more like square pixels.

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