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In order to easily talk about the relations between constructions it’s necessary to define the non-directed relative positioning of a given place to its adjacent ones. Consider the place C, which has the coordinates (r,f,p), and its 8 adjacent places, as shown in the following figure.
TL (top left) T (top) TR (top right) L (left) C (center)R (right) BL (bottom left), B (bottom) BR (bottom right)
Then we define the following mapping between names and coordinates:
Name | Coordinates |
---|---|
TL | (r,f - 1,p - 1) |
T | (r,f - 1,p) |
TR | (r,f - 1,p + 1) |
L | (r,f,p - 1) |
C | (r,f,p) |
R | (r,f,p + 1) |
BL | (r,f + 1,p - 1) |
B | (r,f + 1,p) |
BR | (r,f + 1,p + 1) |