Partial geometrical conversion IFC -> X3D -> STL

Files

• FACTShousewalls.n3
  This is an IFC/RDF file representing, among a couple of other things, wall objects following an extrudedareasolid representation. The IFC/RDF graph follows the IFCOWL ontology as it was developed in 2011 in Ghent University.
  
  
• RULESdefaultvaluesfindall.n3
  Rule set that sets default values for the IFCREFDIRECTION of objects.
  
  
• RULESifctransformationmatrix.n3
  Rule set that generates X3D boxes for extrudedareasolid objects and that calculates the required geometrical properties for these X3D boxes through the appropriate transformation matrices.
  
  
• RULESmatrix.n3
  Rule set that allows to perform matrix calculations.
  
  
• RULESx3dboxtostl.n3
  Rule set that allows to convert an X3D box into a triangulated STL mesh.
  
  
• query.n3
  Using this query file, the EYE reasoning engine is able to retrieve only the X3D boxes that were recognised within the IFC/RDF file (see procedure below).
  
  
• output.n3
  This is an example output file as it is produced by the EYE reasoning engine when doing the full conversion approach (see procedure below - 'doing the conversion').
  
  
• queryoutput.n3
  This is an example output file as it is produced by the EYE reasoning engine when doing the conversion by query approach (see procedure below - 'query conversion rules').
  
  
• README.txt
  Textual overview of this HTML page.
  
  
• geometricalinferenceIFCtoX3DtoSTL_pieterpauwels.zip
  Full ZIP file including all the files above.
  
  

Procedure

Doing the full conversion to X3D and STL

1. Install EYE: see http://eulersharp.sourceforge.net/INSTALL
2. Test run EYE and see that everything is installed correctly
3. See all possible EYE commands on http://eulersharp.sourceforge.net/README
4. open command line
5. • run "eye --nope --no-span http://eulersharp.sourceforge.net/2010/05smml/FACTShousewalls.n3 http://eulersharp.sourceforge.net/2010/05smml/RULESdefaultvaluesfindall.n3 http://eulersharp.sourceforge.net/2010/05smml/RULESifctransformationmatrix.n3 http://eulersharp.sourceforge.net/2010/05smml/RULESmatrix.n3 http://eulersharp.sourceforge.net/2010/05smml/RULESx3dboxtostl.n3 --pass > output.n3"
   • OR run "eye --nope --no-span FACTShousewalls.n3 RULESdefaultvaluesfindall.n3 RULESifctransformationmatrix.n3 RULESmatrix.n3 RULESx3dboxtostl.n3 --pass > output.n3"
6. see additional RDF statements at the end of the output.n3 file

Edit rules

1. open up the rule set files and/or the query file in any notepad application
2. start editing

Query for the X3D boxes that can be found in the IFC/RDF file

1. Install EYE: see http://eulersharp.sourceforge.net/INSTALL
2. Test run EYE and see that everything is installed correctly
3. See all possible EYE commands on http://eulersharp.sourceforge.net/README
4. open command line
5. • run "eye --nope --no-span http://eulersharp.sourceforge.net/2010/05smml/FACTShousewalls.n3 http://eulersharp.sourceforge.net/2010/05smml/RULESdefaultvaluesfindall.n3 http://eulersharp.sourceforge.net/2010/05smml/RULESifctransformationmatrix.n3 http://eulersharp.sourceforge.net/2010/05smml/RULESmatrix.n3 http://eulersharp.sourceforge.net/2010/05smml/RULESx3dboxtostl.n3 --query query.n3 > queryoutput.n3"
   • OR run "eye --nope --no-span FACTShousewalls.n3 RULESdefaultvaluesfindall.n3 RULESifctransformationmatrix.n3 RULESmatrix.n3 RULESx3dboxtostl.n3 --query query.n3 > queryoutput.n3"
6. find the retrieved RDF statements in the queryoutput.n3 file

Reference publication