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16    <h1>Billboard</h1>
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18    <p>This section describes billboarding.</p>
19    <p>Billboarding is the process of controlling the orientation of polygons according to the orientation of the viewpoint.</p>
20    <h2>Billboard Types</h2>
21    <p>Table 1. Types of Billboards</p>
22    <table>
23      <thead>
24        <tr>
25          <th>Billboard Types</th>
26          <th>Description</th>
27        </tr>
28      </thead>
29      <tbody>
30        <tr>
31          <th>World (Standard)</th>
32          <td>Rotates to display with the z-axis parallel with the camera lens axis.<br /> In <CODE>World </CODE>billboarding, the scale and rotation of the parent node influences the process and the z-axis is always parallel with the camera lens axis.</td>
33        </tr>
34        <tr>
35          <th>World Viewpoint (Standard Persp)</th>
36          <td>Rotates to display with the z-axis facing the camera.<br /> In <CODE>World Viewpoint</CODE> billboarding, the scale and rotation of the parent node influences the process and the z-axis always faces the camera. <img src="assets/billboad_World_World Viewpoint.png" alt="World billboarding and World Viewpoint billboarding"/></td>
37        </tr>
38        <tr>
39          <th>Screen (Rotate)</th>
40          <td>Rotates to display with the z-axis parallel with the camera lens axis.<br /> In <CODE>Screen</CODE> billboarding,  the y-axis is tethered to the camera's up direction and the x-axis is always parallel with the camera lens axis. <br /> Influenced by scale of the parent node.</td>
41        </tr>
42        <tr>
43          <th>Screen Viewpoint (Rotate Persp)</th>
44          <td>Rotates to display with the z-axis facing the camera.<br /> In <CODE>Screen Viewpoint</CODE> billboarding,  the y-axis is tethered to the camera's up direction and the x-axis always faces the camera. <br /> Influenced by scale of the parent node.<br /> <img src="assets/billboad_Screen_Screen Viewpoint.png" alt="World billboarding and World Viewpoint billboarding"/></td>
45        </tr>
46        <tr>
47          <th>Y Axial (Y-axis Rotate)</th>
48          <td>Rotates only around the y-axis to display with the z-axis parallel with the camera lens axis.<br /> In <CODE>Y Axial </CODE>billboarding, only the y-axis rotates and the z-axis is always parallel with the camera lens axis.<br /> Influenced by scale and rotate of the parent node.</td>
49        </tr>
50        <tr>
51          <th>Y Axial Viewpoint (Y-axis Rotate Persp)</th>
52          <td>Rotates only around the y-axis to display with the z-axis facing the camera.<br /> In <CODE>Y Axial Viewpoint</CODE> billboarding, only the y-axis rotates and the z-axis always faces the camera. <br /> Influenced by scale and rotate of the parent node.<br /> <img src="assets/billboad_Y Axial_Y Axial_ Viewpoint.png" alt="World billboarding and World Viewpoint billboarding"/></td>
53        </tr>
54      </tbody>
55    </table>
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