On 1.8.2011, at 10:17, Bruce wrote:

> data normal from  to  length  compass  clino left right up down
>
>    a b 10 90 0 [2 0] [0 2] [2 2] [0 0]
>    b c 10 90 0 [0 2] [2 0] [2 2] [0 0]

This solution allow to define for simple 3D (without walls) the better  
model if there is sharp angle on station, or if the narrow passage  
penetrate to huge one (or opposite).

m.

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