Hygrothermal building simulation from a 3D point cloud - the Edo-Wiemken-Monument in Jever

For hygrothermal building simulations the correct building geometry is required, among other things. This is necessary due to the moisture buffer processes, heat storage effects and heat fluxes for building components as well as for the indoor air volume. For the as-built survey, a procedure such as 3D laser scanning provides a modern method for the fast and accurate recording of complex building geometries. The result of 3D laser scanning is a 3D point cloud that contains the geometric properties of the building. The current state of the art is to extract conventional 2D drawings out of the laser scans, i.e. 3D point cloud, and to redraw the 3D geometry in a CAD software which is able to generate a suitable export format for the hygrothermal building simulation software. A direct export out of 3D point cloud in a suitable export format would simplify the work flow. The aim of this paper is to explore the possibilities and restraints of direct modelling in 3D point clouds and requirements of an export/import interface. The exemplary workflow to extract a suitable building model for hygrothermal simulation is developed on the example of the historical building of Edo-Wiemken monument in Jever (Germany).