Add documentation and APIs to support crawling the model

As my questions in StackOverflow explain (Q1, Q2) I’m trying to write an exported from IFC to a simpler format like OBJ For that the glTF example was very useful (thanks @agviegas!)

But there’s still an unresolved problem of how can I access all types in a given IFC as opposed to what all examples focus on which is given a list of types, how do I access them in the IFC.

I was able to get close to getting all types in the following code, but I still can’t make it work for multiple reasons:

const allTypes = {}
ifcLoader.ifcManager.getSpatialStructure(bimModel.modelID).then(ifcProject => {
  let currentElement = ifcProject
  const children = [...currentElement.children]
  const ids = []
  while (children.length) {
    currentElement = children.pop()
    children.push(...currentElement.children)
    if (!currentElement.children.length) {
      console.log(currentElement.type, typeof currentElement.type)
      allTypes[currentElement.type] = true
      ids.push(currentElement.expressID)
    }
  }
  Object.keys(allTypes).forEach(type => {
    this.getGeometriesOfType(type).then(geometries => {
      // enjoy the geometries
    })
  })
})

Mainly because currentElement.type returns the string 'IFCDOOR' and not the enum (int) IFCDOOR as Q2 says

I’m not familiar enough with the project, but maybe during parsing of the IFC the list of types can be maintained and then easily accessed through the ifcManager/ifcProject without having to reiterate everything recursively.

[agviegas]

We could perhaps make a function to get all types present in a file (and all elements)? 🤔

[TxTony]

Hi, About your Question 2 if you’re expecting the following result : where {key : IFCENTITY: int , …}

You could check the web-ifc-api there is a helper method for inspiration here.

Just as an exemple

let IfcElements = {
  103090709: 'IFCPROJECT',
  4097777520: 'IFCSITE',
  4031249490: 'IFCBUILDING',
  3124254112: 'IFCBUILDINGSTOREY',
  3856911033: 'IFCSPACE',
  1674181508: 'IFCANNOTATION',
  25142252: 'IFCCONTROLLER',
  32344328: 'IFCBOILER',
  76236018: 'IFCLAMP',
  90941305: 'IFCPUMP',
  177149247: 'IFCAIRTERMINALBOX',
  182646315: 'IFCFLOWINSTRUMENT',
  263784265: 'IFCFURNISHINGELEMENT',
  264262732: 'IFCELECTRICGENERATOR',
  277319702: 'IFCAUDIOVISUALAPPLIANCE',
  310824031: 'IFCPIPEFITTING',
  331165859: 'IFCSTAIR',
  342316401: 'IFCDUCTFITTING',
  377706215: 'IFCMECHANICALFASTENER',
  395920057: 'IFCDOOR',
  402227799: 'IFCELECTRICMOTOR',
  413509423: 'IFCSYSTEMFURNITUREELEMENT',
  484807127: 'IFCEVAPORATOR',
  486154966: 'IFCWINDOWSTANDARDCASE',
  629592764: 'IFCLIGHTFIXTURE',
  630975310: 'IFCUNITARYCONTROLELEMENT',
  635142910: 'IFCCABLECARRIERFITTING',
  639361253: 'IFCCOIL',
  647756555: 'IFCFASTENER',
  707683696: 'IFCFLOWSTORAGEDEVICE',
  738039164: 'IFCPROTECTIVEDEVICE',
  753842376: 'IFCBEAM',
  812556717: 'IFCTANK',
  819412036: 'IFCFILTER',
  843113511: 'IFCCOLUMN',
  862014818: 'IFCELECTRICDISTRIBUTIONBOARD',
  900683007: 'IFCFOOTING',
  905975707: 'IFCCOLUMNSTANDARDCASE',
  926996030: 'IFCVOIDINGFEATURE',
  979691226: 'IFCREINFORCINGBAR',
  987401354: 'IFCFLOWSEGMENT',
  1003880860: 'IFCELECTRICTIMECONTROL',
  1051757585: 'IFCCABLEFITTING',
  1052013943: 'IFCDISTRIBUTIONCHAMBERELEMENT',
  1062813311: 'IFCDISTRIBUTIONCONTROLELEMENT',
  1073191201: 'IFCMEMBER',
  1095909175: 'IFCBUILDINGELEMENTPROXY',
  1156407060: 'IFCPLATESTANDARDCASE',
  1162798199: 'IFCSWITCHINGDEVICE',
  1329646415: 'IFCSHADINGDEVICE',
  1335981549: 'IFCDISCRETEACCESSORY',
  1360408905: 'IFCDUCTSILENCER',
  1404847402: 'IFCSTACKTERMINAL',
  1426591983: 'IFCFIRESUPPRESSIONTERMINAL',
  1437502449: 'IFCMEDICALDEVICE',
  1509553395: 'IFCFURNITURE',
  1529196076: 'IFCSLAB',
  1620046519: 'IFCTRANSPORTELEMENT',
  1634111441: 'IFCAIRTERMINAL',
  1658829314: 'IFCENERGYCONVERSIONDEVICE',
  1677625105: 'IFCCIVILELEMENT',
  1687234759: 'IFCPILE',
  1904799276: 'IFCELECTRICAPPLIANCE',
  1911478936: 'IFCMEMBERSTANDARDCASE',
  1945004755: 'IFCDISTRIBUTIONELEMENT',
  1973544240: 'IFCCOVERING',
  1999602285: 'IFCSPACEHEATER',
  2016517767: 'IFCROOF',
  2056796094: 'IFCAIRTOAIRHEATRECOVERY',
  2058353004: 'IFCFLOWCONTROLLER',
  2068733104: 'IFCHUMIDIFIER',
  2176052936: 'IFCJUNCTIONBOX',
  2188021234: 'IFCFLOWMETER',
  2223149337: 'IFCFLOWTERMINAL',
  2262370178: 'IFCRAILING',
  2272882330: 'IFCCONDENSER',
  2295281155: 'IFCPROTECTIVEDEVICETRIPPINGUNIT',
  2320036040: 'IFCREINFORCINGMESH',
  2347447852: 'IFCTENDONANCHOR',
  2391383451: 'IFCVIBRATIONISOLATOR',
  2391406946: 'IFCWALL',
  2474470126: 'IFCMOTORCONNECTION',
  2769231204: 'IFCVIRTUALELEMENT',
  2814081492: 'IFCENGINE',
  2906023776: 'IFCBEAMSTANDARDCASE',
  2938176219: 'IFCBURNER',
  2979338954: 'IFCBUILDINGELEMENTPART',
  3024970846: 'IFCRAMP',
  3026737570: 'IFCTUBEBUNDLE',
  3027962421: 'IFCSLABSTANDARDCASE',
  3040386961: 'IFCDISTRIBUTIONFLOWELEMENT',
  3053780830: 'IFCSANITARYTERMINAL',
  3079942009: 'IFCOPENINGSTANDARDCASE',
  3087945054: 'IFCALARM',
  3101698114: 'IFCSURFACEFEATURE',
  3127900445: 'IFCSLABELEMENTEDCASE',
  3132237377: 'IFCFLOWMOVINGDEVICE',
  3171933400: 'IFCPLATE',
  3221913625: 'IFCCOMMUNICATIONSAPPLIANCE',
  3242481149: 'IFCDOORSTANDARDCASE',
  3283111854: 'IFCRAMPFLIGHT',
  3296154744: 'IFCCHIMNEY',
  3304561284: 'IFCWINDOW',
  3310460725: 'IFCELECTRICFLOWSTORAGEDEVICE',
  3319311131: 'IFCHEATEXCHANGER',
  3415622556: 'IFCFAN',
  3420628829: 'IFCSOLARDEVICE',
  3493046030: 'IFCGEOGRAPHICELEMENT',
  3495092785: 'IFCCURTAINWALL',
  3508470533: 'IFCFLOWTREATMENTDEVICE',
  3512223829: 'IFCWALLSTANDARDCASE',
  3518393246: 'IFCDUCTSEGMENT',
  3571504051: 'IFCCOMPRESSOR',
  3588315303: 'IFCOPENINGELEMENT',
  3612865200: 'IFCPIPESEGMENT',
  3640358203: 'IFCCOOLINGTOWER',
  3651124850: 'IFCPROJECTIONELEMENT',
  3694346114: 'IFCOUTLET',
  3747195512: 'IFCEVAPORATIVECOOLER',
  3758799889: 'IFCCABLECARRIERSEGMENT',
  3824725483: 'IFCTENDON',
  3825984169: 'IFCTRANSFORMER',
  3902619387: 'IFCCHILLER',
  4074379575: 'IFCDAMPER',
  4086658281: 'IFCSENSOR',
  4123344466: 'IFCELEMENTASSEMBLY',
  4136498852: 'IFCCOOLEDBEAM',
  4156078855: 'IFCWALLELEMENTEDCASE',
  4175244083: 'IFCINTERCEPTOR',
  4207607924: 'IFCVALVE',
  4217484030: 'IFCCABLESEGMENT',
  4237592921: 'IFCWASTETERMINAL',
  4252922144: 'IFCSTAIRFLIGHT',
  4278956645: 'IFCFLOWFITTING',
  4288193352: 'IFCACTUATOR',
  4292641817: 'IFCUNITARYEQUIPMENT',
  3009204131: 'IFCGRID'
};

      modelID = ifcapi.OpenModel(ifcData);
      
      const result = {};
      const elements = Object.keys(IfcElements).map((e) => parseInt(e));
      for(let i = 0; i < elements.length; i++) {
          const element = elements[i];
          const lines = await ifcapi.GetLineIDsWithType(modelID, element);
          const size = lines.size();
          //@ts-ignore
          for (let i = 0; i < size; i++) result[lines.get(i)] = element;
      }
      console.log(result);

@agviegas is it possible to add a getter IfcApi.properties.getTypes(). here or giving public access to getAllTypesOfModel(modelID: number)