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      <title>Screen Preferences Page</title>
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      <div class="title_topic3" id="xps10_pagetitle">Screen Preferences Page</div>
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      <div class="title_division">Fit Percentage</div>
      <p class="para_division"> Specifies the area of the graphics display to be occupied by the model after a fit operation is performed. For example, a fit percentage of 100% scales the model so that it occupies 100% of the graphics display. Similarly, a fit percentage of 80% fits the model within 80% of the graphics display area, leaving space around the model for the creation of additional geometry.</p>
      <div class="title_division">Use Component Bounding Boxes for Fit</div>
      <p class="para_division"> Controls the use of a performance optimization for Fit operations that involve large assemblies. If the option is turned on, Fit operations use the bounding box of each component instead of using the bounding box of each object in the component. This optimization can substantially improve fit performance for large assemblies but can yield inaccurate fit results in some cases. In these cases, component bounding boxes are larger than expected, so the fitted model appears too small in the view. Because of possible inaccuracy, option Use Component Bounding Boxes for Fit is disabled by default. Turn on the option only if the displayed assembly demonstrates unsatisfactory fit performance. </p>
      <p class="para_division">The system does not save the Use Component Bounding Boxes for Fit setting and disables the option by default at the start of each session. To enable the option by default, set the following environment variable before starting NX. </p><pre class="indent">UGII_ENABLE_COMPONENT_BOXES_FOR_FIT=1

</pre><div class="title_division">Customer Default</div>
      <p class="para_division"> Fit Percentage applies to views in all parts in the current session only. The setting is not saved from session to session. For each session NX initializes it according to a customer default.</p>
      <p class="para_division"></p>
      <div class="title_division">Calibrate</div>
      <p class="para_division"> Use Calibrate to calibrate the physical dimensions of the monitor screen.</p>
      <p class="para_division"> NX queries the window system to obtain the physical dimensions of the screen, but the window system often provides incorrect values. NX uses the physical screen dimensions to draw certain types of geometry with physically accurate dimensions. When the screen dimensions are incorrect, then geometry dimensions are correspondingly incorrect. Circular arcs appear elliptical when one screen dimension ( the width or the height) is much more incorrect than the other dimension.</p>
      <p class="para_division"> Calibrate Screen allows you to specify accurate screen dimensions to NX to compensate for inaccurate information provided by the window system.</p>
      <div class="title_division">Calibrate Screen Resolution Dialog</div>
      <p class="para_division"> The Calibrate Screen Resolution dialog box displays a circle within a square.</p>
      <p align="center"><img align="bottom" src="graphics/prf_vis_screen_calibrate_d.gif"></p>
      <p class="para_division"> The Circle Diameter at the top of the dialog box indicates the diameter of the circle and the length of each side of the square. To reduce the effect of monitor distortion on the appearance of the circle and square, move the dialog box to the center of the screen before making any adjustments.</p>
      <p class="para_division"> Use the horizontal and vertical scales to adjust the width and the height of the circle so it appears circular. You can make these adjustments by eye, but for most accurate geometry sizes, hold a ruler up to the screen and adjust the scales so the width and height of the square measure either 2 inches or 5 centimeters, as indicated by Circle Diameter.</p>
      <p class="para_division"> Reset to System Defaults restores the settings provided by the window system.</p>
      <p class="para_division"> If you have never calibrated the screen resolution, then the values provided by the window system are used by NX. Once you calibrate screen resolution with this dialog box, the settings are saved from session to session in the registry, associated with a particular user and workstation.</p>
      <p class="para_division"> If a particular workstation is known to demonstrate screen resolution problems, then environment variables or resources can be used to initialize correct screen resolution settings for all users of the workstation. To initialize the settings by this means, first compute the millimeters-per-pixel ratios for the width and height of the screen. Measure the width of the active screen area in millimeters and divide this value by the width of the screen in pixels. Repeat this calculation for the height.</p>
      <div class="title_division"> Example A</div>
      <p class="para_division"> Suppose the screen dimensions in millimeters are 342 by 273, and the screen dimensions in pixels are 1280 by 1024.</p>
      <ul>
         <li>
            <p class="para_item"> ratio for width = 342/1280 = 0.267187</p>
         </li>
         <li>
            <p class="para_item"> ratio for height = 273/1024 = 0.266602</p>
         </li>
      </ul>
      <p class="para_division"> After computing the ratios, you can specify them by environment variables UGII_X_RESOLUTION and UGII_Y_RESOLUTION. Set the variables only for the problem workstation.</p>
      <div class="title_division"> Example B</div>
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         <li>
            <p class="para_item"> UGII_X_RESOLUTION=0.267187</p>
         </li>
         <li>
            <p class="para_item"> UGII_Y_RESOLUTION=0.266602</p>
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                  <td valign="top" align="left"><img align="left" src="../graphics/note.gif" alt="Note" title="Note"></td>
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                     <div class="para_note">
                        <p class="para_note_body"> These environment variables are not listed in the default .ugii_env (UNIX) or ugii_env.dat (Windows) environment variable file supplied with NX.</p>
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         </li>
      </ul>
      <p class="para_division"> If the environment variables are unset, on the UNIX workstations only, set the ratios specified by resources: Ugraf***.xResolution and Ugraf***.yResolution in the Ugraf*** resource file.</p>
      <p class="para_division"> Example:</p>
      <ul>
         <li>
            <p class="para_item"> *Ugraf***.xResolution: 0.267187</p>
         </li>
         <li>
            <p class="para_item"> *Ugraf***.yResolution: 0.266602</p>
            <table border="0">
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                  <td valign="top" align="left"><img align="left" src="../graphics/note.gif" alt="Note" title="Note"></td>
                  <td valign="bottom" align="left" width="100%">
                     <div class="para_note">
                        <p class="para_note_body"> These resources are not listed in the default Ugraf*** file supplied with NX.</p>
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         </li>
      </ul>
      <p class="para_division"> The values specified by these environment variables or resources are used only until the user changes the screen resolution with the Calibrate Screen Resolution dialog box. Thereafter, the user specified values are used.</p>
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