| Value | Meaning |
|---|---|
| NORTH_WEST0 | the top left corner. |
| NORTH1 | the top edge. |
| NORTH_EAST2 | the top right corner. |
| WEST3 | the left edge. |
| EAST4 | the right edge. |
| SOUTH_WEST5 | the lower left corner. |
| SOUTH6 | the lower edge. |
| SOUTH_EAST7 | the lower right corner. |
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Determines a surface edge or corner.