FME Transformers: 2024.2
Calculates the volume of a solid object and stores the value in an attribute. The volume is calculated in cube map units, whatever they are.
Configuration
Input Ports
Input
This transformer accepts all geometries.
Output Ports
Output
This transformer calculates the volume of any solid geometries.
For non-3D solid geometries, a volume of zero is always returned.
Parameters
General
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Multiplier |
This parameter can be used to scale the volume from being cube ground units (the units of the feature's coordinates) to something else. This parameter may either be entered as a number, or can be taken from the value of a feature attribute by selecting the attribute name from the pull-down list. |
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Save Volume on Parts as Traits |
If this parameter is selected, each sub-part of the geometry will have its own volume saved as a trait on that geometry part. The name of the trait will be the same as that specified in the Volume Attribute parameter. The volume of a part is considered to be the total volume of that part and any sub-parts it may have. This parameter is often most useful when used with the Geometry XQuery parameter. |
Geometry Part Selection
|
Geometry XQuery |
Use this parameter to isolate only a portion of the input geometry. 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. |
Output Attribute Name
|
Volume |
Name the attribute to contain the total volume of the solid feature. If the Geometry XQuery parameter is used, then only those sub-parts that are filtered will contribute to this total. |
Editing Transformer Parameters
Transformer parameters can be set by directly entering values, using expressions, or referencing other elements in the workspace such as attribute values or user parameters. Various editors and context menus are available to assist. To see what is available, click 
beside the applicable parameter.
How to Set Parameter Values
Defining Values
There are several ways to define a value for use in a Transformer. The simplest is to simply type in a value or string, which can include functions of various types such as attribute references, math and string functions, and workspace parameters.
Using the Text Editor
The Text Editor provides a convenient way to construct text strings (including regular expressions) from various data sources, such as attributes, parameters, and constants, where the result is used directly inside a parameter.
Using the Arithmetic Editor
The Arithmetic Editor provides a convenient way to construct math expressions from various data sources, such as attributes, parameters, and feature functions, where the result is used directly inside a parameter.
Conditional Values
Set values depending on one or more test conditions that either pass or fail.
Parameter Condition Definition Dialog
Content
Expressions and strings can include a number of functions, characters, parameters, and more.
When setting values - whether entered directly in a parameter or constructed using one of the editors - strings and expressions containing String, Math, Date/Time or FME Feature Functions will have those functions evaluated. Therefore, the names of these functions (in the form @<function_name>) should not be used as literal string values.
Content Types
| These functions manipulate and format strings. | |
|
Special Characters |
A set of control characters is available in the Text Editor. |
| Math functions are available in both editors. | |
| Date/Time Functions | Date and time functions are available in the Text Editor. |
| These operators are available in the Arithmetic Editor. | |
| These return primarily feature-specific values. | |
| FME and workspace-specific parameters may be used. | |
| Creating and Modifying User Parameters | Create your own editable parameters. |
Dialog Options - Tables
Table Tools
Transformers with table-style parameters have additional tools for populating and manipulating values.
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Row Reordering
|
Enabled once you have clicked on a row item. Choices include:
|
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Cut, Copy, and Paste
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Enabled once you have clicked on a row item. Choices include:
Cut, copy, and paste may be used within a transformer, or between transformers. |
|
Filter
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Start typing a string, and the matrix will only display rows matching those characters. Searches all columns. This only affects the display of attributes within the transformer - it does not alter which attributes are output. |
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Import
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Import populates the table with a set of new attributes read from a dataset. Specific application varies between transformers. |
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Reset/Refresh
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Generally resets the table to its initial state, and may provide additional options to remove invalid entries. Behavior varies between transformers. |
Note: Not all tools are available in all transformers.
For more information, see Transformer Parameter Menu Options.
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Keywords: Euclidean