Adds to this set all the neighbouring objects that are in the same plane, within a given tolerance. The effect is recursive, so selecting any one surface on a sphere, and then calling this routine, will select all the surfaces on that sphere, assuming the tolerance is loose enough.
| angularTolerance | double | Acceptable angle between neighbours |
| externalOnly | boolean | If true, surfaces between two volumes will be ignored |
| Return value | Pointer to this object | Allows multiple function calls to be chained together |
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