User manual ZELMER 23Z012

[. . . ] THE SOLE AND EXCLUSIVE LIABILITY TO ZELMER, INC. , REGARDLESS OF THE FORM OF ACTION, SHALL NOT EXCEED THE PURCHASE PRICE OF THE MATERIALS DESCRIBED HEREIN. reserves the right to revise and improve its products as it sees fit. This publication describes the state of this product at the time of its publication, and may not reflect the product at all times in the future. Autodesk Trademarks: Discreet is a division of Autodesk, Inc. Autodesk, AutoCAD, 3D Studio MAX, 3D Studio VIZ, DXF, and 3D Studio are registered trademarks, and Lightscape, LSnet, and Discreet are trademarks of Autodesk, Inc. [. . . ] Click Load in the Photometric Web editor. and rotate the view 3. Click the Orbit button until you can see the appropriate area of the Photometric Web editor. The Open dialog appears. 2. In the Open dialog, locate the following IES file: lightscape\lib\lights\lvs\ default. ies 3. Click Open. The photometric web is reset to the default settings. Note: The sample libraries must be installed on your system in order to reset the Photometric Web editor. For information on installing sample libraries, see Chapter 2, "Installation. " Customized Photometric Web Example You can use photometric webs to create customized lights that you can use in your model. The following example illustrates how to create a photometric web. To create a customized photometric web: Note: The Orbit button appears only if you entered the Photometric Web editor in Perspective view. If you entered the editor in an orthographic view, exit to the main application, click the Perspective View button and then return to the Photometric Web editor. In the Mode list, select Insert to add points to the photometric web. Click on the arc roughly halfway between the equator and the south pole. The Photometric Web editor appears. Click the arc at about this point. 153 9 Photometrics 7. In the Symmetry list, select Quadrant. Arcs that mirror the one you created are added to the remaining three quadrants, completing the bottom half of the sphere. 12. The photometric web should resemble the following: 13. Choose Start | Programs | MS-DOS Prompt. input_file output_file A DOS window appears. 2. At the command line, type the following (or your path to the Lightscape application files), and then press Enter: Converting LID to IES The LID2IES utility reads in a LID from a photometric file and writes it out in the IES file format. The LID2IES utility syntax is shown in the following example: lid2ies [options] input_file output_file LID2IES currently accepts the following file formats as input. File Type: Description: CD\PROGRAM FILES\23Z012\BIN 3. Using the following syntax, type a command at the command line, then press Enter: lid2ies [options] input_file output_file The conversion utility reads in a LID from a photometric file and writes it out in the IES file format. LID2IES Options The following table describes the options available for this utility. Option: Description: CIBSE Adopted by the Chartered Institution of Building Services Engineers, as specified in technical memoranda TM14. Designed by the Illuminating Engineering Society, as described in report LM-63-1991. Created by the Danish Illuminating Laboratory, Lysteknisk Laboratorium. Used in Scandinavian countries. -h -v Prints a help message. Prints status information during the conversion process. Output IES file. IES input_file output_file LTLI 156 Lightscape Using LID Conversion Utilities Converting LID to LTLI The LID2LTLI utility reads in a LID from a photometric file and writes it out in the LTLI file format. The LID2LTLI utility syntax is shown in the following example. [. . . ] A common unit for describing the wavelength of light. normal The luminous flux leaving a surface of unit area. luminous flux See surface normal. OpenIRIS GL The quantity of light energy per unit time arriving, leaving, or going through a surface. luminous intensity An industry-standard application programming interface for drawing 3D graphics. orbit The light energy per unit time emitted by a point source in a particular direction. luminous intensity distribution A camera motion around the focus point, keeping the same distance. orientation The function that describes the directional distribution of luminous intensity of a point source. lux See surface orientation. pan The SI unit of illuminance, equal to 1 lumen per square meter. magnify A camera motion parallel to the screen. The focus point moves the same amount in the same direction as the camera. penumbra A filtering operation used by texture mapping techniques to determine the color of an area that covers less than one pixel in image texture space. The transition region at the boundary of a shadow 330 Lightscape Glossary where light shining from a source partly reaches the receiving surface and is partly occluded by some other obstacle in the environment. photometric web the same side. reflection model A description of how light interacts with a surface. refractive index A regular grid of luminous intensity samples that describes the luminous intensity distribution of a light source. photometry Ratio of the speed of light in a vacuum to the speed of light in a material. Determines the amount of light reflected and transmitted at the interface between them. refraction The measurement of light taking into account the psychophysical aspects of the human eye/brain perceptual system. point light The bending of light rays as they pass from one material, such as air, into another material, such as glass. rotate A light source so small compared to its distance from the observer or receiving surface that its radiation can be assumed to come from a dimensionless luminous point. procedural texture mapping The rotation of the camera about its center. saturation (of a color) A more general form of texture mapping that is usually not based on images and that can affect more than just the material color. progressive refinement One of three parameters in the HSV (Hue, Saturation, Value) color space. A color with a low saturation is very close to gray. scroll A technique for computing radiosity solutions that starts with the direct illumination and then computes more and more of the indirect illumination until the solution converges. radiosity A camera motion parallel to the screen. [. . . ]