#!F-adobe-helvetica-medium-r-normal--18* #!N #!N #!Rdisplay Display #!N #!N Category #!N #!N #!Lcatren,dxall760 h Rendering #!EL #!N #!N Function #!N #!N Displays an image or renders a scene and displays an image. #!N #!N Syntax #!CForestGreen #!N #!N #!F-adobe-courier-bold-r-normal--18* #!N #!N #!F-adobe-times-bold-r-normal--18* where #!EF = Display( #!F-adobe-times-bold-r-normal--18* object, camera, where, throttle #!EF ); #!N #!EF #!N #!N #!EC #!N #!N Inputs #!T,1,91,276,461,646 #!F-adobe-times-medium-r-normal--14* #!F-adobe-times-bold-r-normal--18* #!N TAB Name TAB Type TAB Default TAB Description #!EF #!N TAB object TAB object TAB none TAB object to render or image to #!N TAB - TAB - TAB - TAB display #!N TAB camera TAB camera TAB no default TAB camera if rendering is required #!N TAB where TAB window or string TAB the user's terminal TAB host and window for display #!N TAB throttle TAB scalar TAB 0 TAB minimum time between image frames #!N TAB - TAB - TAB - TAB (in seconds) #!N TAB - TAB - TAB - TAB #!EF #!N #!N Outputs #!T,1,161,321,646 #!F-adobe-times-medium-r-normal--14* #!F-adobe-times-bold-r-normal--18* #!N TAB Name TAB Type TAB Description #!EF #!N TAB where TAB window TAB window identifier for Display window #!N TAB - TAB - TAB #!EF #!N #!N Functional Details #!N #!N #!I0 #!N #!N #!I0 #!N #!F-adobe-times-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18* object #!EF #!EF #!I50 #!N is the object to be displayed or to be rendered and displayed. #!N #!I0 #!N #!F-adobe-times-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18* camera #!EF #!EF #!I50 #!N is the camera to be used to render #!F-adobe-times-bold-r-normal--18* object #!EF . If #!F-adobe-times-bold-r-normal--18* camera #!EF is not specified, the system assumes that #!F-adobe-times-bold-r-normal--18* object #!EF is an image to be displayed (e.g., the output of the Render module). Note: A transformed camera cannot be used for this parameter. #!N #!I0 #!N #!F-adobe-times-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18* where #!EF #!EF #!I50 #!N specifies the host and window for displaying the image. On a workstation, the format of the parameter string is: #!N #!F-adobe-times-bold-r-normal--18* X #!EF , #!F-adobe-times-bold-i-normal--18* display, window #!EF where #!F-adobe-times-bold-r-normal--18* X #!EF refers to the X Window System; #!F-adobe-times-bold-i-normal--18* display #!EF is an X server name (e.g., host:0); and #!F-adobe-times-bold-i-normal--18* window #!EF is a window name (and must not begin with two #-characters). As a rule, it is not necessary to set this parameter. But when it is set, the resulting Image window is not controlled by the user interface (e.g., it has no menu options). The function of this parameter is to specify another workstation on which to display an image (e.g., by setting it to " #!F-adobe-times-medium-i-normal--18* X, #!EF workstationname #!F-adobe-times-medium-i-normal--18* :0, #!EF message"). Using the Image tool, you can display the same image to another workstation simply by connecting the module's two outputs to the two inputs of Display and setting #!F-adobe-times-bold-r-normal--18* where #!EF . #!N #!N If you are using SuperviseState or SuperviseWindow to control user interactions in the Display window, then #!F-adobe-times-bold-r-normal--18* where #!EF should be set with the #!F-adobe-times-bold-r-normal--18* where #!EF output of SuperviseWindow. Note: If you are using the #!F-adobe-times-bold-r-normal--18* where #!EF parameter, it is important to set its value #!F-adobe-times-medium-i-normal--18* before #!EF the first execution of Display. #!N #!I0 #!N #!F-adobe-times-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18* throttle #!EF #!EF #!I50 #!N specifies a minimum interval between successive image displays. The default is 0 (no delay). #!N #!I0 #!N #!F-adobe-times-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18* where #!EF #!EF #!I50 #!N The output can be used, for example, by ReadImageWindow to retrieve the pixels of an image after Display has run. #!I0 #!N #!N #!N #!N #!I0 #!N Notes: #!N #!I30 #!N 1. In the user interface, you must use the Image tool rather than Display if you want to use many of the interactive image-manipulation functions provided by Data Explorer. For more information, see #!Lchav,dxall300 h Controlling the Image: View Control... #!EL in IBM Visualization Data Explorer User's Guide. However, see #!Lsupwind,dxall961 h SuperviseWindow #!EL and #!Lsupstat,dxall958 h SuperviseState #!EL for a discussion of how to create your own interaction modes when using the Display window. #!N #!I30 #!N 2. The Display module can render surfaces, volumes, and arbitrary combinations of surfaces and volumes. (However, the current volume-rendering algorithm does not support coincident or perspective volumes.) To render an object, that object must contain a "colors" component. Many modules add a default color. In addition, volume rendering (e.g., of cubes, as opposed to lines) requires an "opacities" component. all surfaces, the lack of an "opacities" component implies an opaque surface. #!N #!I30 #!N 3. Choosing appropriate color and opacity maps for volume rendering can be difficult. The AutoColor, AutoGrayScale, and Color modules use heuristics to generate good values; as a rule of thumb, the opacity should be &approx.0.7/T, and the color value &approx.1.4/T (where T is the thickness of the object in user units). See also #!Lcvolrnd,dxall820 h Coloring Objects for Volume Rendering #!EL . #!I0 #!N #!N #!N #!N #!N #!F-adobe-times-medium-i-normal--18* Next Topic #!EF #!N #!N #!Ltall809,dxall809 h Changing the Resolution of an Image #!EL #!N #!F-adobe-times-medium-i-normal--18* #!N
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