Creates Constructive Solid Geometry (CSG) from pairs of solid geometry features which are input through the A and B ports.

CSG is useful for representing complex solids by specifying the Boolean operations between simpler solids. For example, a wall with a window can be represented by taking the difference of the solid wall against the window. The CSGBuilder can be used to create a CSG solid that is comprised of relationships (order of Boolean operations or a hierarchy of Boolean operations) between the simpler solids.

Input Ports

  • A and B: Pairs of solid geometry features.

Output Ports

Each Boolean operator is output via its corresponding port:


Group Processing

Usage Notes

CSG is the unevaluated model. The CSGEvaluator can be used to compute the equivalent boundary representation of the CSG solid.  

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.


See the definition of CSG at https://en.wikipedia.org/wiki/Constructive_solid_geometry.

FME Community

The FME Community is the place for demos, how-tos, articles, FAQs, and more. Get answers to your questions, learn from other users, and suggest, vote, and comment on new features.

Search for samples and information about this transformer on the FME Community.