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OrientationExtractor

Returns a feature's orientation. This will have different possible return value, based on the input geometry type. Note that the orientation will always be no_orientation for any geometries not listed below.

Area

If the input is an area geometry which fits the right-hand or left-hand rule, the attribute will be set to the value right_hand_rule or left_hand_rule, respectively. The attribute will not have a meaningful value for degenerate areas, such as areas with a figure-8 boundary, or areas that are actually a line or point.

The right-hand rule requires that, on a walk of the area's coordinates, the area is on the right-hand side. Thus, outer boundaries must be clockwise and inner boundaries must be counterclockwise. The opposite is true for the left-hand rule.

Surface

If the input is a surface geometry, where all parts of the surface are consistently oriented, the attribute will be set to the value valid_surface_orientation. If the parts are unoriented or inconsistent, the attribute will be set to the value no_orientation.

Solid

If the input is a solid geometry, where all of the normals point away from the interior of the solid, the attribute will be set to the value valid_solid_orientation. If all of the normals point towards the interior of the solid, the attribute will be set to the value reversed_solid_orientation. In all other cases, the attribute will be set to the value no_orientation.

Point

If the input is an oriented point geometry, the point’s orientation is extracted as a 3x3 matrix representation, and the attribute set as a list of the matrix values, in row-major order. Aggregates and multipoints only have point orientation extracted if they contain a single oriented point.

Parameters

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