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      <title>Backface Culling</title>
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      <div class="title_topic4" id="xps10_pagetitle"> Backface Culling</div>
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               <p class="para_td"><a class="links" href="javascript:void(0)" onclick="top.openFile('customizing_nx/prf_vpp_d.html');return(false);">Overview</a></p>
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               <p class="para_td"> How To</p>
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               <p class="para_td">Options </p>
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               <p class="para_td"><a class="links" href="javascript:void(0)" onclick="top.openFile('customizing_nx/prf_vpp_r.html');return(false);">Related Topics</a></p>
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      </table><br><p class="para_topic"> Backface Culling is a session attribute, so it applies to views in all parts in the session. The attribute setting is determined as follows:</p>
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            <p class="para_item"> If you previously used the Visualization Performance Preferences dialog box to modify the attribute, then that setting is used. Note that the setting is saved, for each user, from session to session.</p>
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            <p class="para_item"> If you have never modified the attribute, then the setting is initialized to the value specified by the UGII_BACKFACE_CULLING environment variable, if it is set. The variable can be set to TRUE or FALSE. </p>
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                        <p class="para_note_body"> This environment variable is not listed in the default .ugii_env (UNIX) or .ugii_env.dat (Windows) environment variable file supplied with NX </p>
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            <p class="para_item">If the environment variable is unset, then on UNIX workstations only, the setting is initialized to the value specified by the ugraf***.backfaceCulling resource in the ugraf*** resource file, if it is set. The resource can be set to TRUE or FALSE. </p>
            <p class="para_item">Example:</p><pre class="indent">*ugraf***.backfaceCulling: TRUE</pre><table border="0">
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                        <p class="para_note_body">This resource is not listed in the default ugraf*** file supplied with NX </p>
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            <p class="para_item"> If neither the environment variable nor the resource are set, then the setting is initialized to FALSE. </p>
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