The use of the –I option enables the filling up of images, which are horizontally cut. In the case of non-180° images, an external measured illuminance value can be provided by using the –i or –I option. Values lower than 0.2 are out of the range of the user acceptance tests, where the program is based on and should be interpreted carefully. The DGP describes the fraction of disturbed persons,caused by glare from daylight (range 0…1). The program calculates the daylight glare probability (DGP) as well as other glare indexes (dgi,ugr,vcp,cgi) to the standard output. Default value (-y) is 50000 cd/m², can be changed by using -Y value.Ī smoothing option (-s) counts initial non-glare source pixels to glare sources, when they are surrounded by a glare source. Luminance peaks can be extracted to separate glare sources by using the -y or -Y value option (default since version v0.9c). The color is chosen by chance, no significance is given by the color. The luminance values of all pixels are kept to the initial value. If a check file is written (-c fname), the detected glare sources will be colored to different colors where the rest of the image is set to gray. This merging is performed in-between a search area, given by an opening angle (-r, default =0.2 in radiant). In the second step the program tries to merge glare source pixels to one glare source, when they are placed nearby each other. The other two methods are described below. Each pixel, exceeding this value multiplied by the -b factor is treated as a potential glare source. In this (task) area the average luminance is calculated. The recommended method is to define a task area by -t or -T option. Three different threshold methods are implemented. In the first step, the program uses a given threshold to determine all glare sources.
RELUX MAC
Windows, MAC and Linux versions of Radiance can be downloaded here:Įvalglare determines and evaluates glare sources within a 180° fish-eye-image, given in the RADIANCE image format (.pic or. Radiance is used by architects and engineers to predict illumination, visual quality and appearance of innovative design spaces, and by researchers to evaluate new lighting and daylighting technologies.” The program is continuously being updated. The primary advantage of Radiance over simpler lighting calculation and rendering tools is that there are no limitations on the geometry or the materials that may be simulated. Simulation results may be displayed as colour images, numerical values and contour plots. luminance + colour), irradiance (illuminance + colour) and glare indices.
Calculated values include spectral radiance (ie. Input files specify the scene geometry, materials, luminaires, time, date and sky conditions. Radiance is a suite of programs for the analysis and visualisation of lighting in design. LUXION has specialized in technology advancing state-of-the-art in rendering and computer based lighting simulations, and has expert knowledge in areas related to rendering technology, light scattering, light transport algorithms such as photon mapping, and spectral simulation.
The program is freely available and can be accessed from the link below.ĭaylight Visualizer is developed by LUXION in collaboration with the VELUX Group. VELUX Daylight Visualizer has an efficient workflow and intuitive design, which makes it accessible and easy to use. Images are post-processed in a GUI, where pseudo colours and contour lines can be applied to obtain luminous values from the rendered views. Output from Daylight Visualizer include images and numerical values. The program also permits users to import 3D models generated by CAD programs in order to facilitate a good workflow and provide flexibility to the model geometry“.ĭaylight Visualizer can be used to calculate luminance, illuminance and daylight factors for all 16 sky types defined in CIE Standard General Sky.
RELUX WINDOWS
The Daylight Visualizer intuitive modelling tool permits quick generation of 3D models in which roof and facade windows are freely inserted. It is intended to promote the use of daylight in buildings and to aid professionals by predicting and documenting daylight levels and appearance of a space prior to realization of the building design. VELUX Daylight Visualizer is a validated simulation and visualization tool for daylighting design and analysis.
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