Towards the Definition of Workflows for Automation in HBIM Generation

Abstract

In the last years creation of as-built Building Information Modelling (BIM), and Historic Building Information Modelling (HBIM) in particular, has become a widely researched topic. In particular, the so-called "Scan.-to-BIM" procedure has received a lot of attention. This is mainly given by the fact that nowadays, terrestrial laser scanning (TLS), either static and mobile, and 3D photogrammetry are quite popular techniques to acquire building geometry raw data. However, turning a set of scans into a BIM model is still a labor-intensive and manual work. This paper presents two workflows for increasing the automation in HBIM generation. The presented approaches differ in the level of automation achieved and in the level of maturity. Indeed, while the first one presents a higher level of automation it is designed only to work in the case straight geometrical features are dominant in the scene (i.e., Manhattan world assumption holds). In addition, it is currently implemented in Matlab. On the other hand, the second one is closer to semi-automated modelling since some manual operations are still needed. However, it is implemented as a Revit Plugin and for this reason it is more user-friendly.

Towards digital twins for heritage buildings: A workflow proposal

“…They propose a workflow to maintain a very high Level of Accuracy using NURBS-based modeling in Rhino3D to generate objects that could be recognized as walls and ceilings and enriched with semantic data for representing ruined heritage. For Previtali and Banfi, 25 the main gap in HBIM is the labor-intensiveness of converting raw point cloud data, obtained through 3D laser scanning and photogrammetry, to BIM models. They propose an add-in software for Revit that segments point clouds and converts them to geometric primitives and NURBS surfaces while generating documentation for the geometric entities.…”

“…To deal with this gap, one of the following paths must be taken: 1) combining several programs and file formats in the workflow, resulting in models that are difficult to update and maintain; or 2) oversimplifying the geometry and, thus, sacrificing the model's accuracy as well as its usability for simulation purposes. 8,13,19,[23][24][25][29][30][31] Thus, more research is needed to seamlessly insert NURBS modeling in HBIM workflows to accurately represent complex geometry.…”

Automação da modelagem BIM a partir de nuvens de pontos

“…O uso de modelos BIM, para representar e gerenciar edificações existentes, permite centralizar as informações da edificação, facilitando o manuseio desses dados e possibilitando a geração automática de variados produtos. No contexto de edificações históricas, um modelo geométrico sólido da edificação é de grande importância para análises como a definição de planos de conservação e planejamento de trabalhos de restauro (GROETELAARS, 2015;PREVITALI;BANFI, 2018).…”

“…O fluxo geral desse trabalho automatizado é dado por: (1) Aquisição de dados (incluindo obtenção de dados em campo e o registro das nuvens de pontos); (2) Segmentação da nuvem de pontos; (3) Classificação dos elementos detectados; (4) Construção do modelo BIM (PREVITALI; BANFI, 2018).…”