This viewer is part of an open source project that works on IFC files represented in JSON syntax: IFC.JSON files. The viewer is an open-source web-based viewer, relying on Javascript. It allows loading IFC.JSON files and viewing them (3D building models and semantics). Furthermore, data can be queried and subsets can be created for information exchanges in JSON format. This is done by filtering using JSONPath text filters (https://jsonpath.com/).

Sample IFC.JSON files are provided in the sample_files directory. These files are obtained using the Trimble Sketchup exporter by Jan Brouwer (BIMTools): https://github.com/BIM-Tools/Sketchup-ifcJSON-export.

The app has the following requirements:

• node.js version 12.14.0
• npm version 6.13.4

And an express dependency:

• express.js version 4.17.1

Follow these steps to install the software:

• Download the code from this GitHub repository.
• Unpack file contents.
• Open a Command Line Interface (CLI), Terminal or Command Prompt in the main folder.
• Run the below command:

> npm install

• Open a Command Line Interface (CLI), Terminal or Command Prompt in the main folder.
• Run the below command:

> npm start

• Go to http://localhost:8000/.
• The software opens an IFC.JSON file by default, after which you can start filtering and querying the data in the viewer.

The IFC.JSON Viewer has a 3D viewer embedded by default. The top part of the screen includes a JSONPath filter for filtering elements. A number of example filter are given:

$..
$..[?(@.Class=='Wall')]
$..[?(@.Class=='Slab')]
$..[?(@.Class == 'FurnishingElement' || @.Class == 'Space' || @.Class == 'Slab')]
$..[?(@.Class == 'Slab' || @.Class == 'FurnishingElement' )]
$..[?(@.PSet_Revit_Phasing=='New Construction')]
$..[?(@.Volume==262924.86837177584)]
$..[?(@.Volume<=50000.0)]
$..[?(@.GlobalId=='32ca7e71-00a5-4a22-9043-3c8d01dd2444')]
$..[?(@.Class == 'Wall' && @.Volume<=50000.0)]

The IFC.JSON Viewer is made available under the MIT licence. See LICENSE.

Dennis Shelden
Rensselaer Polytechnic Institute
[email protected]