LTB-Light for Mac Perform natural and artificial lighting calculation.
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LTB-Light for Mac Description

LTB-Light is a Mac OS X application that permits natural and artificial lighting calculation with a color radiosity method applied to a finite elements plan. LTB-Light runs under Apple Macintosh and implements OpenGL. Data management take places through an internal powerful CAD system, directly in a perspective view. It is possible to introduce flatten surfaces with colored glazing, furniture, curved surfaces like cylinders, cones, ellipsoids, hyperboloids and complex objects like cross vaults. LTB-Light is able to share information with other CADs through DXF and PICT files. Light sources are totally managed inside the main program; it is possible to import, show, modify and use the IESNA LM-63 photometric data files (ASCII text file commonly used by North American lighting fixture manufacturers) EULUMDAT (european standard) and even PICT files (the program can convert a drawing in a photometry!); photometric data are modelled through 36 "C" (azimuth) curves and 181 "gamma" (zenith) angles, while lamp color is controlled by its color temperature or RGB color. Calculations permits to control levels of illuminations, allocated energy amounts, correct positioning of light sources (type, numbers, power,...), direct and reflected colors. LTB-Light results (Horizontal, vertical along X+,Y+,X-,Y- directions, semi-cylindrical and main camera-direction Illuminament; Luminances; Daylight Factors; RGB coordinates; Contrast control C.R.F.; Glare control TI, G, U.G.R., C.G.I. and G.R.; Lighting Pollution) will be presented in black and white, 8-colors or true-colors perspective view for the whole model and for every object in the scene. Features: - 3D interactive workspace environment with full use of OpenGL and a native Mac OS X interface - Shares information with other CAD via DXF and PICT files - Uses standard IESNA LM-63 photometric data files (USA) and EULUMDAT (Europe) - Controls Illumination levels, energy, sources specs - Output in various standard format - Many powerful tools inside

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