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This is a growing set of groovy tools to handle IFC data. GroovyIFC is currently based on the Open IFC Java Toolbox (see prerequisites). The tool set started out as dae2ifc.groovy, a skript to write IFC geometry from collada files.

The heart of the script - IfcBuilder - can be easily used to write arbitrary IFC entities programmatically from arbitrary input data - in a compact and concious fashion. Apart from writing, the combination of Groovy and OpenIfcTools is a very handy way for ad-hoc queries on IFC data. Another use case is quick and dirty programmatic manipulation of IFC files for research or prototyping purposes (see DeepSpatialHierarchy.groovy). A set of utility methods is bundled in IfcModelHelper.

People asked for it, so I decided to put it out in the wild. Hope it'll gonna be useful to anybody. Comes with no warranty.

Prerequisites

How to write IFC

This example shows how dae2ifc.groovy builds its IFC model

def ifcBuilder = new IfcBuilder()
ifcBuilder.proxy {
  globalId = globallyUniqueId('123456')
  representation = productDefinitionShape {
    representations = [
      shapeRepresentation {
        representationIdentifier = label('Body')
        representationType = label('Brep')
        items = [] as Set
      }
    ]  
  }
}
ifcBuilder.write("path/to/file", "file.ifc")

This results in "file.ifc" with the following lines in its data part:

#1= IFCSHAPEREPRESENTATION($,'Body','Brep',());
#2= IFCPRODUCTDEFINITIONSHAPE($,$,(#1));
#3= IFCPROXY('123456',$,$,$,$,$,#2,$,$);

How to read IFC

Just read in and use GPath. You could do something like this:

def model = new IfcModel()
model.readStepFile("file.ifc")
def products = model.ifcObjects.findAll{ it instanceof IfcProduct }
println products.representation.representations.representationType
// find all products without representations or with representations without items
products.findAll{prod ->
  ! prod.representation?.representations.any{it -> !it.items.isEmpty()}
}

Nice to read, isn't it?

How to improve

I'd love to see these improvements, but I'm afraid I won't find the time. Don't hesitate to fork the project.

dae2ifc.groovy:

  • validate manifold Brep geometry
  • optimize ifc file: write each point once only (currently multiple times - once for every polygon)

other use cases:

  • sophisticated example for reading/querying IFC (e.g. representation counter)

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