DonutBuilder

The resulting donut and hole features will be output through this port.

Features with non-area or null geometry will be output through this port.

Rejected features will have an fme_rejection_code attribute with the value INVALID_GEOMETRY_TYPE.

The default behavior is to use the entire set of input features as the group. This option allows you to select attributes that define which groups to form. Each set of features which have the same value for all of these attributes will be processed as an independent group.

Note: How parallel processing works with FME: see About Parallel Processing for detailed information.

This parameter determines whether or not the transformer should perform the work across parallel processes. If it is enabled, a process will be launched for each group specified by the Group By parameter.

Parallel Processing Levels

For example, on a quad-core machine, minimal parallelism will result in two simultaneous FME processes. Extreme parallelism on an 8-core machine would result in 16 simultaneous processes.

You can experiment with this feature and view the information in the Windows Task Manager and the Workbench Log window.

No: This is the default behavior. Processing will only occur in this transformer once all input is present.

By Group: This transformer will process input groups in order. Changes on the value of the Group By parameter on the input stream will trigger batch processing on the currently accumulating group. This will improve overall speed if groups are large/complex, but could cause undesired behavior if input groups are not truly ordered.

When viewed in 2D (ignoring Z), a path (which may define the border of a polygon) may appear to be closed as shown in the left figure below. This same path, when viewed in 3D, may appear to be open as shown in the right figure below.

To specify how (and if) paths should be closed in 3D, select one of the listed modes.

Mode	Description	Example
Extend	The Curve is extended so that all vertices are left at their original location.
Average	Subsequent vertices that are not connected, but share an x and a y value are combined into one vertex, whose Z value is the average of the original two.
First Wins	Subsequent vertices that are not connected, but share an x and a y value are combined into one vertex, whose Z value is taken from the first encountered vertex.
Last Wins	Subsequent vertices that are not connected, but share an x and a y value are combined into one vertex, whose Z value is taken from the last encountered vertex.
Ignore	Z values are ignored. No change is made to the way the nodes are connected.

The Drop Holes parameter indicates whether or not features used to cut holes in containing features should themselves be dropped or output.

This parameter will be added to each output feature and will contain "yes" if that feature was used to cut a hole into some containing feature, and "no" if that feature was not used as a hole.

Area features may be considered in groups based on the value of one or more attributes. Only features in the same group are then considered for hole nesting.

Preserve Internal Edges (for advanced FME users) specifies that coordinate "cycles" within a polygon are allowable and will be preserved. A "cycle" is a line segment that occurs twice in the same polygon's boundary (once in each direction).