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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>vtlib library: TVTerrain Class Reference</title><link href="doxygen.css" rel="stylesheet" type="text/css"><link href="tabs.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.4.5 --><div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="modules.html"><span>Modules</span></a></li> <li id="current"><a href="annotated.html"><span>Classes</span></a></li> <li><a href="dirs.html"><span>Directories</span></a></li> </ul></div><div class="tabs"> <ul> <li><a href="annotated.html"><span>Class List</span></a></li> <li><a href="hierarchy.html"><span>Class Hierarchy</span></a></li> <li><a href="functions.html"><span>Class Members</span></a></li> </ul></div><h1>TVTerrain Class Reference<br><small>[<a class="el" href="group__dynterr.html">Dynamic Terrain (CLOD)</a>]</small></h1><!-- doxytag: class="TVTerrain" --><!-- doxytag: inherits="vtDynTerrainGeom" -->Inheritance diagram for TVTerrain:<p><center><img src="classTVTerrain__inherit__graph.png" border="0" usemap="#TVTerrain__inherit__map" alt="Inheritance graph"></center><map name="TVTerrain__inherit__map"><area href="classvtDynTerrainGeom.html" shape="rect" coords="57,380,191,407" alt=""><area href="classvtDynGeom.html" shape="rect" coords="7,305,100,332" alt=""><area href="classvtGeom.html" shape="rect" coords="19,231,88,257" alt=""><area href="classvtNode.html" shape="rect" coords="21,156,85,183" alt=""><area href="classvtNodeBase.html" shape="rect" coords="7,81,100,108" alt=""><area href="classvtTarget.html" shape="rect" coords="19,7,88,33" alt=""><area doxygen="vtdata.tag:../vtdata/" href="../vtdata/classvtHeightFieldGrid3d.html" shape="rect" coords="124,305,265,332" alt=""><area doxygen="vtdata.tag:../vtdata/" href="../vtdata/classvtHeightField3d.html" shape="rect" coords="137,231,252,257" alt=""><area doxygen="vtdata.tag:../vtdata/" href="../vtdata/classvtHeightField.html" shape="rect" coords="144,156,245,183" alt=""></map><center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center><a href="classTVTerrain-members.html">List of all members.</a><hr><a name="_details"></a><h2>Detailed Description</h2><dl compact><dt><b></b></dt><dd>The TVTerrain class implements the <a href="http://www.cs.arizona.edu/topovista/">TopoVista</a> algorithm for regular-grid terrain LOD. </dd></dl><dl compact><dt><b></b></dt><dd>This algorithm requires that the input heightfield is a square regular grid, of any size. Storage requirements are around 14 bytes/vertex. The data is represented in memory by a binary tree of faces. </dd></dl><dl compact><dt><b></b></dt><dd>The VTP implementation consists of an adaptation of the author's own source code, made to work in the <a class="el" href="classvtDynTerrainGeom.html">vtDynTerrainGeom</a> framework. </dd></dl><dl compact><dt><b></b></dt><dd>The algorithm is promising, but needs a lot of work:<ul><li>Doesn't currently address lighting or texturing</li><li>Doesn't utilize triangle strips</li><li>Uses a very simple error metric based only on ground (2D) distance </li></ul></dd></dl><dl compact><dt><b></b></dt><dd>So far i have extended the algorithm in the following ways:<ul><li>Added full 6-plane view-volume culling (instead of the previously simple 2D culling). This required implementing some <a href="http://vterrain.org/LOD/culling.html">3d triangle culling</a> which was mysteriously absent from the computer graphics literature. </li></ul></dd></dl><p><table border="0" cellpadding="0" cellspacing="0"><tr><td></td></tr><tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="7ecb3e1d5dc17588489359a59e30ab7c"></a><!-- doxytag: member="TVTerrain::Init" ref="7ecb3e1d5dc17588489359a59e30ab7c" args="(const vtElevationGrid *pGrid, float fZScale)" -->DTErr </td><td class="memItemRight" valign="bottom"><a class="el" href="classTVTerrain.html#7ecb3e1d5dc17588489359a59e30ab7c">Init</a> (const <a class="elRef" doxygen="vtdata.tag:../vtdata/" href="../vtdata/classvtElevationGrid.html">vtElevationGrid</a> *pGrid, float fZScale)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">initialization <br></td></tr></table><hr size="1"><address style="align: right;"><small>Generated on Mon Jan 14 14:41:00 2008 for vtlib library by <a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.5 </small></address></body></html>⌨️ 快捷键说明
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