Function DistanceMetric.ClosestAsSeenFromAbove

This is only supported by some graph types. The navmesh/recast/grid graph fully support this. Point graphs do not support this field at all, and will completely ignore it.

This is only supported by some graph types. The navmesh/recast graphs fully support this. The grid graphs, however, only support this if the direction is parallel to the natural 'up' direction of the graph. The grid graphs will search as if the direction is in the graph's up direction if this value is anything other than Vector3.zero. Point graphs do not support this field at all, and will completely ignore it.

On recast/navmesh graphs there is a performance penalty when using this feature with a direction which is not parallel to the natural up direction of the graph. Typically you should only set it to such values if you have a spherical or non-planar world (see Spherical Worlds).

If you want to use the graph's natural up direction, use the overload which does not take any parameters.