Re: 2d circular union nav-mesh

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> For interior arcs, you can reduce those to lines, since the arc 
> should be fully contained within two circles; if it weren't, it 
> would be an exterior arc.

Hi Matt,

Actually, i think i can contribute something here :) If the arc segment 
plus the centre of the circle the segment is from form a virtual slice of 
pie, then for any given point you can calculate the distance to the arc 
segment in one of two ways:

1) For any given point which lies within the angle range defined by the 
edges of the pie, form a vector from the pie centre to the candidate 
point, normalise and then scale by the circle radius - this gives the 
point projected onto the arc segment. You then just do a length op to find 
the distance

2) For any point outside of the pie (i.e. outside the angle range), the 
closest distance to the arc segment is the length of the vector defined by 
nearer of the two vertices which lie at the pie extremes subtracted from 
the candidate point.

Mmmm, pie :)

Cheers, Paul.
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