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      <title>Characteristics of a Curve Trajectory Profile</title>
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      <div class="title_topic6" id="xps10_pagetitle">Characteristics of a Curve Trajectory Profile</div>
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      <p class="para_topic">After selecting the curves or edges for the trajectory profile and clicking OK, you will see the following features displayed in the graphics window: (see Sample Curve Trajectory Profile ):</p>
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            <p class="para_item">The path of the trajectory profile is highlighted in the system color.</p>
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            <p class="para_item">Orientation Vector displays at the beginning of the trajectory oriented in the direction of the path.</p>
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            <p class="para_item">The View Up Vector for the profile displays. You can change the direction of the View Up Vector using the Reverse Up Vector button (in conjunction with the Set Up Camera option).</p>
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            <p class="para_item">Frame0 is inserted and marked with an asterisk.</p>
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      <div class="title_figure">Sample Curve Trajectory Profile</div>
      <p class="para_topic">Frame0 is automatically added at the beginning of the trajectory profile. It specifies the initial, base camera settings for the trajectory (i.e., the perspective, field of view and the View Up Vector). You can change the settings for Frame0 using the Set Up Camera option on the Edit Key Frame dialog.</p>
      <p class="para_topic">Unless you use the Redefine option, you cannot delete or move the initial key frame point, and it will always have a frame step count of zero.</p>
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