Evaluates expressions on each point in a point cloud feature, including algebraic operations and conditional statements, and sets individual point cloud component values.

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Typical Uses

  • Performing calculations on individual point values within a point cloud
  • Updating point cloud component values
  • Adding new point cloud components

How does it work?

The PointCloudExpressionEvaluator receives point cloud features and evaluates defined expressions using the individual points’ component values, then outputs a point cloud feature with the calculated values applied to existing or new components.


Expressions are defined in the right-hand column of the Component Expression(s) table. Each line in the table corresponds to one component, which may be new or existing. Component names may be selected from a list of standard components, or user-specified.

The Data Type for each component is also specified here, and may be set to automatically determine the appropriate type, or to preserve the type of an existing component. Strings are not supported.

Expressions may be as simple a constant value or simple arithmetic operation. The Arithmetic Editor is available via the Expression ellipsis (...) button to assist in the construction of expressions. Point cloud components are available in the editor.

Expressions are case-sensitive.


Usage Notes

  • This transformer does not support strings. To add string components, use the PointCloudComponentAdder.
  • This transformer can be used to set an existing component to a constant value by setting the expression to the desired constant.
  • The arithmetic editor is available from the ellipsis (...) button to assist in constructing expressions. See Arithmetic Editor for full documentation.

Choosing a Point Cloud Transformer

FME has a selection of transformers for working specifically with point cloud data.

For information on point cloud geometry and properties, see Point Clouds (IFMEPointCloud).


Input Ports

Output Ports


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.

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. There are a number of tools and shortcuts that can assist in constructing values, generally available from the drop-down context menu adjacent to the value field.

Dialog Options - Tables

Transformers with table-style parameters have additional tools for populating and manipulating values.


Processing Behavior


Feature Holding


Dependencies None

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Examples may contain information licensed under the Open Government Licence – Vancouver and/or the Open Government Licence – Canada.

Keywords: point "point cloud" cloud PointCloud LiDAR sonar