A very handy extension for 3ds Max which will enhance the rendering process greatly.This topic shows an example of a photometric data file in the IES format. Long lines may be broken between values as needed by following the instructions given earlier. Each vertical slice of values must start on a new line. Then the candela values corresponding to the vertical plane through the second horizontal angle are listed, and so on until the last horizontal angle. First all the candela values corresponding to the first horizontal angle are listed, starting with the value corresponding to the smallest vertical angle and moving up the associated vertical plane. If it is greater than 180° and less than or equal to 360°, the distribution exhibits no lateral symmetries. If it is 180°, the distribution is symmetric about a vertical plane. If it is 90°, the distribution is symmetric in each quadrant. If it is 0°, the distribution is axially symmetric. The last angle determines the degree of lateral symmetry displayed by the intensity distribution.
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