Alexandre Denis Stoll | EPFL Graph Search

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Texture mapping and IFC material retrievement for virtual reality applications

Sergi Aguacil Moreno, Laurent Deschamps, Sebastian Duque Mahecha, Alexandre Denis Stoll

Most current software support the Industry Foundation Classes (IFC) transfer of Building Information Models (BIMs) to applications enabling Virtual Reality (VR) navigation (BuildingSMART, 2020; Kiviniemi, Tarandi, Karlshøj, Bell, and Karud, 2008; Poljanšek, 2017). However, a review of current industry practice and scientific literature shows a rupture between the information concerning the materiality of objects stored in the IFC model data and the texture mapping image-source determining the objects' appearance in VR environments. This document presents an application based on the IfcOpenShell library (IfcOpenShell, 2020), which provides a mapping table allowing to align the retrieved relevant IFC model data to any chosen set of image or pattern files. It produces a DAE file and a linked repertoire defining texture mapping onto model objects visualised in VR. The application also allows the automatic updating after modification of the original model.

2021

Virtual reality enabled building-data management through the combination of a fully integrated IFC-BIM model and an IoT-based building management system

Sergi Aguacil Moreno, Jean-Philippe Bacher, Laurent Deschamps, Sebastian Duque Mahecha, Alexandre Denis Stoll

Professionals involved in building construction and monitoring increasingly implement new practices made available by Building Information Modelling (BIM), Virtual Reality (VR) and the Internet of Things (IoT). In spite of numerous efforts, most methods integrating BIM and IoT rely on Application Programming Interfaces (APIs) related to Closed Source Software (CSS), which practically exclude the basic BIM Industry Foundation Classes (IFC) standard. Within the fewer methods actively using the IFC data model to VR-enhanced interfaces, we can observe the loss of crucial IFC information. This article describes a workflow of a BIM-IFC to VR-enabled data management definition, articulating a Building Management Systems' (BMS) database or, as an alternative, an IoT system. This workflow is presented through four phases (model making, device inventory, protocol setting, and real-time VR interaction), which correspond to the actual sections of the information flow that we have successfully tested.

2021