VELUX Daylight Visualizer is a simulation tool developed by Luxion for the VELUX Group. It provides physically based simulations and analysis of the effect of windows and daylighting in buildings. The visualizer includes a modeling component that makes it possible to build simple house models and add windows from an integrated database of VELUX roof products and generic facade products. It is also possible to perform daylighting simulation on models imported from a 3d CAD package.