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<p>
Converts a earth coordinate (project or geographic) to a world coordinate on the surface of the heightfield.     </td>
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<a class="anchor" name="36bdc3c5983331f833972c9d287f2072"></a><!-- doxytag: member="vtHeightField3d::FindAltitudeAtPoint" ref="36bdc3c5983331f833972c9d287f2072" args="(const FPoint3 &amp;p3, float &amp;fAltitude, bool bTrue=false, int iCultureFlags=0, FPoint3 *vNormal=NULL) const =0" --><p>
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          <td class="md" nowrap valign="top">virtual bool vtHeightField3d::FindAltitudeAtPoint           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">const <a class="el" href="classFPoint3.html">FPoint3</a> &amp;&nbsp;</td>
          <td class="mdname" nowrap> <em>p3</em>, </td>
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          <td class="md" nowrap>float &amp;&nbsp;</td>
          <td class="mdname" nowrap> <em>fAltitude</em>, </td>
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          <td class="md" nowrap>bool&nbsp;</td>
          <td class="mdname" nowrap> <em>bTrue</em> = <code>false</code>, </td>
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          <td class="md" nowrap>int&nbsp;</td>
          <td class="mdname" nowrap> <em>iCultureFlags</em> = <code>0</code>, </td>
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          <td class="md" nowrap align="right"></td>
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          <td class="md" nowrap><a class="el" href="classFPoint3.html">FPoint3</a> *&nbsp;</td>
          <td class="mdname" nowrap> <em>vNormal</em> = <code>NULL</code></td>
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          <td class="md">)&nbsp;</td>
          <td class="md" colspan="2"> const<code> [pure virtual]</code></td>
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<p>
Given a point in world coordinates, determine the elevation at that point.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign="top"></td><td valign="top"><em>p3</em>&nbsp;</td><td>The point to test. Only the X and Z values are used. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>fAltitude</em>&nbsp;</td><td>The resulting elevation at that point, by reference. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>bTrue</em>&nbsp;</td><td>True to test true elevation. False to test the displayed elevation (possibly exaggerated.) </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>iCultureFlags</em>&nbsp;</td><td>Pass 0 to test only the heightfield itself, non-zero to test any culture objects which may be sitting on the heightfield. Values include:<ul>
<li>CE_STRUCTURES Test structures on the ground.</li><li>CE_ROADS Test roads on the ground.</li><li>CE_ALL Test everything on the ground. </li></ul>
</td></tr>
    <tr><td valign="top"></td><td valign="top"><em>vNormal</em>&nbsp;</td><td>If you supply a pointer to a vector, it will be set to the upward-pointing surface normal at the ground point.</td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>true if successful, false if there was nothing found at that point. </dd></dl>

<p>
Implemented in <a class="el" href="classvtElevationGrid.html#3566cc387be76130277e64a6ed79321e">vtElevationGrid</a>, and <a class="el" href="classvtTin.html#3566cc387be76130277e64a6ed79321e">vtTin</a>.    </td>
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<a class="anchor" name="c6790f796f572a3c07f43774a7180e26"></a><!-- doxytag: member="vtHeightField3d::PointIsAboveTerrain" ref="c6790f796f572a3c07f43774a7180e26" args="(const FPoint3 &amp;p) const " --><p>
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          <td class="md" nowrap valign="top">int vtHeightField3d::PointIsAboveTerrain           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">const <a class="el" href="classFPoint3.html">FPoint3</a> &amp;&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>p</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap> const</td>
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<p>
<dl compact><dt><b>Returns:</b></dt><dd>0 if below terrain, 1 if above terrain, -1 if off terrain. </dd></dl>
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<a class="anchor" name="b1210c68b3bbb1d0913b7c0d0b5ae53b"></a><!-- doxytag: member="vtHeightField3d::SetEarthExtents" ref="b1210c68b3bbb1d0913b7c0d0b5ae53b" args="(const DRECT &amp;ext)" --><p>
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          <td class="md" nowrap valign="top">void vtHeightField3d::SetEarthExtents           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">const <a class="el" href="classDRECT.html">DRECT</a> &amp;&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>ext</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap><code> [virtual]</code></td>
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<p>
Set the geographic extents of the grid. 
<p>
Reimplemented from <a class="el" href="classvtHeightField.html#b1210c68b3bbb1d0913b7c0d0b5ae53b">vtHeightField</a>.
<p>
Reimplemented in <a class="el" href="classvtHeightFieldGrid3d.html#b1210c68b3bbb1d0913b7c0d0b5ae53b">vtHeightFieldGrid3d</a>.    </td>
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<hr size="1"><address style="align: right;"><small>Generated on Mon Jan 14 14:40:55 2008 for vtdata library by&nbsp;
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