Abstract
Abstract. This paper presents a platform for multilayered documentation of cultural heritage, inspired by the current lack of a heritage BIM approach capable of creating models with both high geometric accuracy and high semantic richness. The platform is developed in the Unity game engine. It comprises several integrated and interconnected layers or datasets that can include data of different types, such as a point cloud, textured polygonal mesh, parametric information model and images, both 2D images and 360° panoramas. We present an overview of the platform concept, the benefits of the proposed multilayered representation and the details on the implementation and integration of datasets. Also, we present some of the innovative functions made possible by this integration, such as point cloud or mesh cutting and preforming measurements on 2D images and 360° panoramas. We perform and present the results of a preliminary analysis of platform functions, which indicates that the platform can be used for accurate measurement and retrieval of 3D coordinates.
Highlights
Technological developments of the past decade have made capturing the geometry of heritage buildings and creating detailed reality-based models more accessible
We propose a novel heritage Building Information Modelling (BIM) concept that enables the creation of models with both rich semantics and high geometric accuracy
It should be noted that, even when simplified, the parametric model can be used to produce engineering drawings such as 2D plans, elevations, and sections, which is an important and often needed functionality of heritage BIM (Murphy et al, 2009). Another benefit is that storing information within a building information model enables its sharing using standard exchange formats, the dominant one being IFC (Volk et al, 2014), which enables the use of external specialised software for modelling or performing different analysis and simulations
Summary
Technological developments of the past decade have made capturing the geometry of heritage buildings and creating detailed reality-based models more accessible. Parametric models are not suitable for applications that require visual fidelity and high geometric accuracy, such as documentation, restoration, exhibitions or virtual tours For these purposes, highly detailed reality-based polygonal mesh or point cloud models are preferred, but these on the other hand lack the semantics. The main limitation of existing platforms is in how they manage additional information Both BIM3DSG and NUBES propose novel ways to describe building elements and to organise and store semantic and other information. The multilayered representation brings several additional benefits which are discussed
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