It is also due to the designers’ lack of knowledge and experience in the field, and the low availability of lighting evaluation tools at design practices. This is, in part, due to the fact that most architects work in CAD environments that emulate low-tech drafting tools, hence creating a flat representation of the design subject, lacking the information necessary for lighting simulations. Evaluating a building’s lighting conditions during the design process can be a complicated task that requires a deep acquaintance with photometry, hence usually not performed at all or, at best, left for late stages in the design process, performed by specialists and lighting consultants. They can also measure calculate and display qualities of light that affect the building’s user’s well-being and visual comfort, thus creating an overall assessment of a building’s natural (and artificial) lighting performance. The tools can measure amounts of light hitting the building’s surfaces, the shape and nature of the shadows it casts onto its environment and itself. While the way light interacts with buildings we design is complex and dynamic, the prediction of a building’s performance under daylight is possible and can be performed through many physical and computer based tools available. We experience spaces, materials, compositions and time through the medium of light. Lighting holds a cardinal role in the human perception of architecture. This research aims to create a BIM based comprehensive performance driven design process, with focus on lighting conditions as the performance to be examined. For that reason, it is recommended to conduct evaluations as early as possible, allowing for educated decisions to be made at early stages. The earlier simulations are made, the lower is the effort needed for design changes to be made. The evaluation of some of these aspects requires conducting simulations in order to collect the information necessary in the design process' decision-making. For the design to fulfill those requirements, the designer should consider multiple performance aspects: space size, building materials and textures, colors, openings’ sizes, comfort conditions, acoustics, thermal qualities, aesthetics and lighting conditions. When designing a building, the basic and minimal requirement from the designers would be for those buildings to be functional, safe, comfortable and pleasant.
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