Resets the geometry type of the feature. Depending on the feature’s actual coordinates, the transformer may have no effect. This transformer is sometimes used to have area features treated as though they were linear features, either because some later processing requires lines, or the destination format represents lines different than polygons and the linear representation is desired.
Geometry Type Output
If you try to set the feature’s geometry type to fme_polygon and the feature has more than one coordinate, then the first coordinate and the last coordinate must be the same or the feature’s geometry type will be unchanged.
If you try to set the feature’s geometry type to fme_line or fme_polygon and the feature had only one coordinate, then the feature’s geometry type is unchanged.
If you try to set the feature's geometry to fme_composite_surface and the geometry of the feature is not a multi-surface or brep solid, or extrusion or box or csg solid, then the feature's geometry will be unchanged. An exception for this option is when the source feature contains a mesh, in which case this option will produce a multi-surface.
If you try to set the feature's geometry to fme_brep_solid and the geometry of the feature is not a composite surface or multi-surface or extrusion or box or csg solid, then the feature's geometry will be unchanged.
If you try to set the feature's geometry to fme_point_cloud and the geometry of the feature is not a raster, multi-point or a simple aggregate made up only of points, then the feature's geometry will be unchanged.
If you try to set the feature’s geometry to fme_aggregate and the geometry of the feature is not a multi, then the feature’s geometry will be unchanged.
If you try to set the feature’s geometry to fme_multi and the geometry of the feature is not an aggregate, then the feature’s geometry will be unchanged.
Geometry Part Selection
Use this parameter if you want to isolate only a portion of the geometry passed in to the transformer. If no criteria are specified, the action will apply to the entire geometry at all levels.
Selection can be based on structural location, geometry name, type, appearance information, traits, trait storage types, or definition reference. The syntax used is a restricted set of XQuery, where the return clause is fixed.
The basic Geometry XQuery dialog allows you to construct simple selection queries by automatically writing the necessary query based on specified test clauses. Clicking the Switch to Advanced button opens the Advanced Editor, which allows you to type a query free-form, for more expressive queries.
Note: Once you switch to Advanced mode, you will have to clear all parameters before you can return to Basic mode.
A hierarchical geometry is represented as nodes of type geometry, with attributes containing information about traits, type, and name for each geometry.
- You can't directly use the GeometryCoercer to convert donut polygons to lines. If you need to do this, extract the donut parts first using the DonutHoleExtractor.
Editing Transformer Parameters
Using a set of menu options, transformer parameters can be assigned by referencing other elements in the workspace. More advanced functions, such as an advanced editor and an arithmetic editor, are also available in some transformers. To access a menu of these options, click beside the applicable parameter. For more information, see Transformer Parameter Menu Options.
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