559 lines
31 KiB
HTML
559 lines
31 KiB
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<div id="projectname">ViewDesignEngine
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 <span id="projectnumber">3.1.0</span>
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<div id="projectbrief">高性能 CAD 计算几何引擎</div>
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<a href="#nested-classes">类</a> |
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<a href="#pub-methods">Public 成员函数</a> |
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<a href="classvde_1_1spatial_1_1BVH-members.html">所有成员列表</a> </div>
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<div class="title">vde::spatial::BVH类 参考</div> </div>
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<p>包围盒层次结构 — 三角形网格加速结构
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<a href="classvde_1_1spatial_1_1BVH.html#details">更多...</a></p>
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<p><code>#include <<a class="el" href="bvh_8h_source.html">bvh.h</a>></code></p>
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类 vde::spatial::BVH 继承关系图:</div>
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<div class="center"><img src="classvde_1_1spatial_1_1BVH__inherit__graph.png" border="0" usemap="#avde_1_1spatial_1_1BVH_inherit__map" alt="Inheritance graph"/></div>
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<center><span class="legend">[<a target="top" href="graph_legend.html">图例</a>]</span></center></div>
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vde::spatial::BVH 的协作图:</div>
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<center><span class="legend">[<a target="top" href="graph_legend.html">图例</a>]</span></center></div>
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<table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="nested-classes"></a>
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类</h2></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structvde_1_1spatial_1_1BVH_1_1HitResult.html">HitResult</a></td></tr>
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<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">射线最近命中查询结果 <a href="structvde_1_1spatial_1_1BVH_1_1HitResult.html#details">更多...</a><br /></td></tr>
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<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
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Public 成员函数</h2></td></tr>
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<tr class="memitem:a3c38846e83b92b7c249a6c7fd79dccfe"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classvde_1_1spatial_1_1BVH.html#a3c38846e83b92b7c249a6c7fd79dccfe">BVH</a> (const <a class="el" href="structvde_1_1spatial_1_1BVHBuildOptions.html">BVHBuildOptions</a> &opts={})</td></tr>
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<tr class="memdesc:a3c38846e83b92b7c249a6c7fd79dccfe"><td class="mdescLeft"> </td><td class="mdescRight">构造 <a class="el" href="classvde_1_1spatial_1_1BVH.html" title="包围盒层次结构 — 三角形网格加速结构">BVH</a> 并指定构建选项 <a href="classvde_1_1spatial_1_1BVH.html#a3c38846e83b92b7c249a6c7fd79dccfe">更多...</a><br /></td></tr>
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<tr class="separator:a3c38846e83b92b7c249a6c7fd79dccfe"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a35d6e474202154c8618f1b0faa79bed7"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classvde_1_1spatial_1_1BVH.html#a35d6e474202154c8618f1b0faa79bed7">build</a> (const std::vector< Triangle3D > &tris) override</td></tr>
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<tr class="memdesc:a35d6e474202154c8618f1b0faa79bed7"><td class="mdescLeft"> </td><td class="mdescRight">清除已有数据并重建 <a class="el" href="classvde_1_1spatial_1_1BVH.html" title="包围盒层次结构 — 三角形网格加速结构">BVH</a> <a href="classvde_1_1spatial_1_1BVH.html#a35d6e474202154c8618f1b0faa79bed7">更多...</a><br /></td></tr>
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<tr class="separator:a35d6e474202154c8618f1b0faa79bed7"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:aff29d9b52ae60df8ee80206f45e34a58"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classvde_1_1spatial_1_1BVH.html#aff29d9b52ae60df8ee80206f45e34a58">insert</a> (const Triangle3D &tri) override</td></tr>
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<tr class="memdesc:aff29d9b52ae60df8ee80206f45e34a58"><td class="mdescLeft"> </td><td class="mdescRight">插入单个三角形 <a href="classvde_1_1spatial_1_1BVH.html#aff29d9b52ae60df8ee80206f45e34a58">更多...</a><br /></td></tr>
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<tr class="separator:aff29d9b52ae60df8ee80206f45e34a58"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a3b6f76186507b3dd44fe18a8be63b8c1"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classvde_1_1spatial_1_1BVH.html#a3b6f76186507b3dd44fe18a8be63b8c1">remove</a> (const Triangle3D &tri) override</td></tr>
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<tr class="memdesc:a3b6f76186507b3dd44fe18a8be63b8c1"><td class="mdescLeft"> </td><td class="mdescRight">删除三角形 <a href="classvde_1_1spatial_1_1BVH.html#a3b6f76186507b3dd44fe18a8be63b8c1">更多...</a><br /></td></tr>
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<tr class="separator:a3b6f76186507b3dd44fe18a8be63b8c1"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a04e463cf4d56f976a1a4af54695357f6"><td class="memItemLeft" align="right" valign="top">std::vector< Triangle3D > </td><td class="memItemRight" valign="bottom"><a class="el" href="classvde_1_1spatial_1_1BVH.html#a04e463cf4d56f976a1a4af54695357f6">query_range</a> (const AABB3D &range) const override</td></tr>
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<tr class="memdesc:a04e463cf4d56f976a1a4af54695357f6"><td class="mdescLeft"> </td><td class="mdescRight">AABB 范围查询 <a href="classvde_1_1spatial_1_1BVH.html#a04e463cf4d56f976a1a4af54695357f6">更多...</a><br /></td></tr>
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<tr class="separator:a04e463cf4d56f976a1a4af54695357f6"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a58f4b998d28631ccb1574c70f011f83f"><td class="memItemLeft" align="right" valign="top">std::vector< Triangle3D > </td><td class="memItemRight" valign="bottom"><a class="el" href="classvde_1_1spatial_1_1BVH.html#a58f4b998d28631ccb1574c70f011f83f">query_knn</a> (const Point3D &point, size_t k) const override</td></tr>
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<tr class="memdesc:a58f4b998d28631ccb1574c70f011f83f"><td class="mdescLeft"> </td><td class="mdescRight">K 近邻查询 <a href="classvde_1_1spatial_1_1BVH.html#a58f4b998d28631ccb1574c70f011f83f">更多...</a><br /></td></tr>
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<tr class="separator:a58f4b998d28631ccb1574c70f011f83f"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a99e4ff172513e51223eda759d24cf5a4"><td class="memItemLeft" align="right" valign="top">std::vector< Triangle3D > </td><td class="memItemRight" valign="bottom"><a class="el" href="classvde_1_1spatial_1_1BVH.html#a99e4ff172513e51223eda759d24cf5a4">query_ray</a> (const Ray3Dd &ray) const override</td></tr>
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<tr class="memdesc:a99e4ff172513e51223eda759d24cf5a4"><td class="mdescLeft"> </td><td class="mdescRight">射线查询：返回所有命中的三角形 <a href="classvde_1_1spatial_1_1BVH.html#a99e4ff172513e51223eda759d24cf5a4">更多...</a><br /></td></tr>
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<tr class="separator:a99e4ff172513e51223eda759d24cf5a4"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a6c96e1ffdbd30eb528bb0b412e837e77"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classvde_1_1spatial_1_1BVH.html#a6c96e1ffdbd30eb528bb0b412e837e77">clear</a> () override</td></tr>
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<tr class="memdesc:a6c96e1ffdbd30eb528bb0b412e837e77"><td class="mdescLeft"> </td><td class="mdescRight">清空 <a class="el" href="classvde_1_1spatial_1_1BVH.html" title="包围盒层次结构 — 三角形网格加速结构">BVH</a> 树和所有三角形 <a href="classvde_1_1spatial_1_1BVH.html#a6c96e1ffdbd30eb528bb0b412e837e77">更多...</a><br /></td></tr>
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<tr class="separator:a6c96e1ffdbd30eb528bb0b412e837e77"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ad7fa14f4a51abeb82673b8846479ed46"><td class="memItemLeft" align="right" valign="top">size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="classvde_1_1spatial_1_1BVH.html#ad7fa14f4a51abeb82673b8846479ed46">size</a> () const override</td></tr>
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<tr class="memdesc:ad7fa14f4a51abeb82673b8846479ed46"><td class="mdescLeft"> </td><td class="mdescRight">三角形数量 <a href="classvde_1_1spatial_1_1BVH.html#ad7fa14f4a51abeb82673b8846479ed46">更多...</a><br /></td></tr>
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<tr class="memitem:ad7db451c3765fc5d43f67c7b5be1ebea"><td class="memItemLeft" align="right" valign="top">std::optional< <a class="el" href="structvde_1_1spatial_1_1BVH_1_1HitResult.html">HitResult</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classvde_1_1spatial_1_1BVH.html#ad7db451c3765fc5d43f67c7b5be1ebea">query_ray_nearest</a> (const Ray3Dd &ray) const</td></tr>
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<tr class="memdesc:ad7db451c3765fc5d43f67c7b5be1ebea"><td class="mdescLeft"> </td><td class="mdescRight">射线最近命中查询 <a href="classvde_1_1spatial_1_1BVH.html#ad7db451c3765fc5d43f67c7b5be1ebea">更多...</a><br /></td></tr>
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<tr class="separator:ad7db451c3765fc5d43f67c7b5be1ebea"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="inherit_header pub_methods_classvde_1_1spatial_1_1SpatialIndex"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_classvde_1_1spatial_1_1SpatialIndex')"><img src="closed.png" alt="-"/> Public 成员函数 继承自 <a class="el" href="classvde_1_1spatial_1_1SpatialIndex.html">vde::spatial::SpatialIndex< Triangle3D ></a></td></tr>
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<tr class="memitem:ab27637c0122a9fd82ebc12598db496f1 inherit pub_methods_classvde_1_1spatial_1_1SpatialIndex"><td class="memItemLeft" align="right" valign="top">virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="classvde_1_1spatial_1_1SpatialIndex.html#ab27637c0122a9fd82ebc12598db496f1">~SpatialIndex</a> ()=default</td></tr>
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<tr class="separator:ab27637c0122a9fd82ebc12598db496f1 inherit pub_methods_classvde_1_1spatial_1_1SpatialIndex"><td class="memSeparator" colspan="2"> </td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">详细描述</h2>
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<div class="textblock"><p>包围盒层次结构 — 三角形网格加速结构 </p>
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<p><a class="el" href="classvde_1_1spatial_1_1BVH.html" title="包围盒层次结构 — 三角形网格加速结构">BVH</a> 将三角形集合递归划分为嵌套的包围盒树。 每个内部节点存储其子节点包围盒的并集， 叶节点包含不超过 leaf_size 个三角形的引用。</p>
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<p>构建时间复杂度 O(n log n)，空间 O(n)。 单条射线查询 O(log n)，最近命中 O(log n)。</p>
|
||
|
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<p>三种分裂策略：</p><ul>
|
||
|
|
<li>Middle: 沿最长轴按包围盒中点一分为二，构建最快但质量一般</li>
|
||
|
|
<li>Equal: 按三角形数量平分，适合均匀分布</li>
|
||
|
|
<li>SAH: 最小化随机射线命中成本期望，构建慢但查询最快（默认）</li>
|
||
|
|
</ul>
|
||
|
|
<div class="fragment"><div class="line"><a class="code" href="classvde_1_1spatial_1_1BVH.html#a3c38846e83b92b7c249a6c7fd79dccfe">BVH</a> bvh(BVHBuildOptions{ .strategy = <a class="code" href="namespacevde_1_1spatial.html#a6deaf5da7638743215a4b4decc76f7eea2c825725f1016edf12b60a8c3b9d8714">BVHSplitStrategy::SAH</a>, .leaf_size = 8 });</div>
|
||
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<div class="line">bvh.build(triangles);</div>
|
||
|
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<div class="line"><span class="keyword">auto</span> hit = bvh.query_ray_nearest(ray);</div>
|
||
|
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<div class="line"><span class="keyword">auto</span> near = bvh.query_knn(p, 10);</div>
|
||
|
|
<div class="ttc" id="aclassvde_1_1spatial_1_1BVH_html_a3c38846e83b92b7c249a6c7fd79dccfe"><div class="ttname"><a href="classvde_1_1spatial_1_1BVH.html#a3c38846e83b92b7c249a6c7fd79dccfe">vde::spatial::BVH::BVH</a></div><div class="ttdeci">BVH(const BVHBuildOptions &opts={})</div><div class="ttdoc">构造 BVH 并指定构建选项</div><div class="ttdef"><b>Definition:</b> <a href="bvh_8h_source.html#l00077">bvh.h:77</a></div></div>
|
||
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<div class="ttc" id="anamespacevde_1_1spatial_html_a6deaf5da7638743215a4b4decc76f7eea2c825725f1016edf12b60a8c3b9d8714"><div class="ttname"><a href="namespacevde_1_1spatial.html#a6deaf5da7638743215a4b4decc76f7eea2c825725f1016edf12b60a8c3b9d8714">vde::spatial::BVHSplitStrategy::SAH</a></div><div class="ttdeci">@ SAH</div></div>
|
||
|
|
</div><!-- fragment --><dl class="section see"><dt>参见</dt><dd><a class="el" href="classvde_1_1spatial_1_1SpatialIndex.html" title="空间索引抽象基类">SpatialIndex</a>, <a class="el" href="classvde_1_1spatial_1_1Octree.html" title="八叉树空间索引">Octree</a>, <a class="el" href="classvde_1_1spatial_1_1KDTree.html" title="k-d 树空间索引">KDTree</a>, <a class="el" href="classvde_1_1spatial_1_1RTree.html" title="R 树动态空间索引">RTree</a> </dd></dl>
|
||
|
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|
||
|
|
<p class="definition">在文件 <a class="el" href="bvh_8h_source.html">bvh.h</a> 第 <a class="el" href="bvh_8h_source.html#l00070">70</a> 行定义.</p>
|
||
|
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</div><h2 class="groupheader">构造及析构函数说明</h2>
|
||
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<a id="a3c38846e83b92b7c249a6c7fd79dccfe"></a>
|
||
|
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<h2 class="memtitle"><span class="permalink"><a href="#a3c38846e83b92b7c249a6c7fd79dccfe">◆ </a></span>BVH()</h2>
|
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|
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<div class="memitem">
|
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<div class="memproto">
|
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<table class="mlabels">
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<tr>
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<td class="mlabels-left">
|
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<table class="memname">
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<tr>
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<td class="memname">vde::spatial::BVH::BVH </td>
|
||
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<td>(</td>
|
||
|
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<td class="paramtype">const <a class="el" href="structvde_1_1spatial_1_1BVHBuildOptions.html">BVHBuildOptions</a> & </td>
|
||
|
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<td class="paramname"><em>opts</em> = <code>{}</code></td><td>)</td>
|
||
|
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<td></td>
|
||
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</tr>
|
||
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</table>
|
||
|
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</td>
|
||
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<td class="mlabels-right">
|
||
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<span class="mlabels"><span class="mlabel">inline</span><span class="mlabel">explicit</span></span> </td>
|
||
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</tr>
|
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</table>
|
||
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</div><div class="memdoc">
|
||
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|
||
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<p>构造 <a class="el" href="classvde_1_1spatial_1_1BVH.html" title="包围盒层次结构 — 三角形网格加速结构">BVH</a> 并指定构建选项 </p>
|
||
|
|
<dl class="params"><dt>参数</dt><dd>
|
||
|
|
<table class="params">
|
||
|
|
<tr><td class="paramname">opts</td><td>构建选项（分裂策略、叶节点大小、最大深度） </td></tr>
|
||
|
|
</table>
|
||
|
|
</dd>
|
||
|
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</dl>
|
||
|
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|
||
|
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<p class="definition">在文件 <a class="el" href="bvh_8h_source.html">bvh.h</a> 第 <a class="el" href="bvh_8h_source.html#l00077">77</a> 行定义.</p>
|
||
|
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|
||
|
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</div>
|
||
|
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</div>
|
||
|
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<h2 class="groupheader">成员函数说明</h2>
|
||
|
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<a id="a35d6e474202154c8618f1b0faa79bed7"></a>
|
||
|
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<h2 class="memtitle"><span class="permalink"><a href="#a35d6e474202154c8618f1b0faa79bed7">◆ </a></span>build()</h2>
|
||
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|
||
|
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<div class="memitem">
|
||
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<div class="memproto">
|
||
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<table class="mlabels">
|
||
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<tr>
|
||
|
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<td class="mlabels-left">
|
||
|
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<table class="memname">
|
||
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<tr>
|
||
|
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<td class="memname">void vde::spatial::BVH::build </td>
|
||
|
|
<td>(</td>
|
||
|
|
<td class="paramtype">const std::vector< Triangle3D > & </td>
|
||
|
|
<td class="paramname"><em>tris</em></td><td>)</td>
|
||
|
|
<td></td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</td>
|
||
|
|
<td class="mlabels-right">
|
||
|
|
<span class="mlabels"><span class="mlabel">override</span><span class="mlabel">virtual</span></span> </td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div><div class="memdoc">
|
||
|
|
|
||
|
|
<p>清除已有数据并重建 <a class="el" href="classvde_1_1spatial_1_1BVH.html" title="包围盒层次结构 — 三角形网格加速结构">BVH</a> </p>
|
||
|
|
<p>使用 SAH（或指定策略）自顶向下递归构建。 构建复杂度 O(n log n)。</p>
|
||
|
|
<dl class="params"><dt>参数</dt><dd>
|
||
|
|
<table class="params">
|
||
|
|
<tr><td class="paramname">tris</td><td>三角形数组 </td></tr>
|
||
|
|
</table>
|
||
|
|
</dd>
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<p>实现了 <a class="el" href="classvde_1_1spatial_1_1SpatialIndex.html#a3cc8e80b3f92fbb5766094066a120364">vde::spatial::SpatialIndex< Triangle3D ></a>.</p>
|
||
|
|
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
<a id="a6c96e1ffdbd30eb528bb0b412e837e77"></a>
|
||
|
|
<h2 class="memtitle"><span class="permalink"><a href="#a6c96e1ffdbd30eb528bb0b412e837e77">◆ </a></span>clear()</h2>
|
||
|
|
|
||
|
|
<div class="memitem">
|
||
|
|
<div class="memproto">
|
||
|
|
<table class="mlabels">
|
||
|
|
<tr>
|
||
|
|
<td class="mlabels-left">
|
||
|
|
<table class="memname">
|
||
|
|
<tr>
|
||
|
|
<td class="memname">void vde::spatial::BVH::clear </td>
|
||
|
|
<td>(</td>
|
||
|
|
<td class="paramname"></td><td>)</td>
|
||
|
|
<td></td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</td>
|
||
|
|
<td class="mlabels-right">
|
||
|
|
<span class="mlabels"><span class="mlabel">override</span><span class="mlabel">virtual</span></span> </td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div><div class="memdoc">
|
||
|
|
|
||
|
|
<p>清空 <a class="el" href="classvde_1_1spatial_1_1BVH.html" title="包围盒层次结构 — 三角形网格加速结构">BVH</a> 树和所有三角形 </p>
|
||
|
|
|
||
|
|
<p>实现了 <a class="el" href="classvde_1_1spatial_1_1SpatialIndex.html#a609143536e3307d5bacaf21cb19c0840">vde::spatial::SpatialIndex< Triangle3D ></a>.</p>
|
||
|
|
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
<a id="aff29d9b52ae60df8ee80206f45e34a58"></a>
|
||
|
|
<h2 class="memtitle"><span class="permalink"><a href="#aff29d9b52ae60df8ee80206f45e34a58">◆ </a></span>insert()</h2>
|
||
|
|
|
||
|
|
<div class="memitem">
|
||
|
|
<div class="memproto">
|
||
|
|
<table class="mlabels">
|
||
|
|
<tr>
|
||
|
|
<td class="mlabels-left">
|
||
|
|
<table class="memname">
|
||
|
|
<tr>
|
||
|
|
<td class="memname">void vde::spatial::BVH::insert </td>
|
||
|
|
<td>(</td>
|
||
|
|
<td class="paramtype">const Triangle3D & </td>
|
||
|
|
<td class="paramname"><em>tri</em></td><td>)</td>
|
||
|
|
<td></td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</td>
|
||
|
|
<td class="mlabels-right">
|
||
|
|
<span class="mlabels"><span class="mlabel">override</span><span class="mlabel">virtual</span></span> </td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div><div class="memdoc">
|
||
|
|
|
||
|
|
<p>插入单个三角形 </p>
|
||
|
|
<p>当前实现：加入图元列表后全量重建。 如需增量插入，建议使用 RTree。</p>
|
||
|
|
<dl class="params"><dt>参数</dt><dd>
|
||
|
|
<table class="params">
|
||
|
|
<tr><td class="paramname">tri</td><td>要插入的三角形 </td></tr>
|
||
|
|
</table>
|
||
|
|
</dd>
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<p>实现了 <a class="el" href="classvde_1_1spatial_1_1SpatialIndex.html#ad494ecb8a0178a8bedddfd0278b39162">vde::spatial::SpatialIndex< Triangle3D ></a>.</p>
|
||
|
|
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
<a id="a58f4b998d28631ccb1574c70f011f83f"></a>
|
||
|
|
<h2 class="memtitle"><span class="permalink"><a href="#a58f4b998d28631ccb1574c70f011f83f">◆ </a></span>query_knn()</h2>
|
||
|
|
|
||
|
|
<div class="memitem">
|
||
|
|
<div class="memproto">
|
||
|
|
<table class="mlabels">
|
||
|
|
<tr>
|
||
|
|
<td class="mlabels-left">
|
||
|
|
<table class="memname">
|
||
|
|
<tr>
|
||
|
|
<td class="memname">std::vector<Triangle3D> vde::spatial::BVH::query_knn </td>
|
||
|
|
<td>(</td>
|
||
|
|
<td class="paramtype">const Point3D & </td>
|
||
|
|
<td class="paramname"><em>point</em>, </td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td class="paramkey"></td>
|
||
|
|
<td></td>
|
||
|
|
<td class="paramtype">size_t </td>
|
||
|
|
<td class="paramname"><em>k</em> </td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td></td>
|
||
|
|
<td>)</td>
|
||
|
|
<td></td><td> const</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</td>
|
||
|
|
<td class="mlabels-right">
|
||
|
|
<span class="mlabels"><span class="mlabel">override</span><span class="mlabel">virtual</span></span> </td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div><div class="memdoc">
|
||
|
|
|
||
|
|
<p>K 近邻查询 </p>
|
||
|
|
<p>使用最小堆遍历 BVH，按包围盒距离剪枝。</p>
|
||
|
|
<dl class="params"><dt>参数</dt><dd>
|
||
|
|
<table class="params">
|
||
|
|
<tr><td class="paramname">point</td><td>查询点 </td></tr>
|
||
|
|
<tr><td class="paramname">k</td><td>返回数量 </td></tr>
|
||
|
|
</table>
|
||
|
|
</dd>
|
||
|
|
</dl>
|
||
|
|
<dl class="section return"><dt>返回</dt><dd>最近的 k 个三角形 </dd></dl>
|
||
|
|
|
||
|
|
<p>实现了 <a class="el" href="classvde_1_1spatial_1_1SpatialIndex.html#afae94f2d82bf75c2096c409809735381">vde::spatial::SpatialIndex< Triangle3D ></a>.</p>
|
||
|
|
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
<a id="a04e463cf4d56f976a1a4af54695357f6"></a>
|
||
|
|
<h2 class="memtitle"><span class="permalink"><a href="#a04e463cf4d56f976a1a4af54695357f6">◆ </a></span>query_range()</h2>
|
||
|
|
|
||
|
|
<div class="memitem">
|
||
|
|
<div class="memproto">
|
||
|
|
<table class="mlabels">
|
||
|
|
<tr>
|
||
|
|
<td class="mlabels-left">
|
||
|
|
<table class="memname">
|
||
|
|
<tr>
|
||
|
|
<td class="memname">std::vector<Triangle3D> vde::spatial::BVH::query_range </td>
|
||
|
|
<td>(</td>
|
||
|
|
<td class="paramtype">const AABB3D & </td>
|
||
|
|
<td class="paramname"><em>range</em></td><td>)</td>
|
||
|
|
<td> const</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</td>
|
||
|
|
<td class="mlabels-right">
|
||
|
|
<span class="mlabels"><span class="mlabel">override</span><span class="mlabel">virtual</span></span> </td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div><div class="memdoc">
|
||
|
|
|
||
|
|
<p>AABB 范围查询 </p>
|
||
|
|
<p>遍历与 range 相交的 <a class="el" href="classvde_1_1spatial_1_1BVH.html" title="包围盒层次结构 — 三角形网格加速结构">BVH</a> 节点，收集叶节点中重叠的三角形。 复杂度 O(log n + k)，k 为结果数量。</p>
|
||
|
|
<dl class="params"><dt>参数</dt><dd>
|
||
|
|
<table class="params">
|
||
|
|
<tr><td class="paramname">range</td><td>查询包围盒 </td></tr>
|
||
|
|
</table>
|
||
|
|
</dd>
|
||
|
|
</dl>
|
||
|
|
<dl class="section return"><dt>返回</dt><dd>与 range 相交的三角形列表 </dd></dl>
|
||
|
|
|
||
|
|
<p>实现了 <a class="el" href="classvde_1_1spatial_1_1SpatialIndex.html#acaddc825aeb513861587e070ed222584">vde::spatial::SpatialIndex< Triangle3D ></a>.</p>
|
||
|
|
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
<a id="a99e4ff172513e51223eda759d24cf5a4"></a>
|
||
|
|
<h2 class="memtitle"><span class="permalink"><a href="#a99e4ff172513e51223eda759d24cf5a4">◆ </a></span>query_ray()</h2>
|
||
|
|
|
||
|
|
<div class="memitem">
|
||
|
|
<div class="memproto">
|
||
|
|
<table class="mlabels">
|
||
|
|
<tr>
|
||
|
|
<td class="mlabels-left">
|
||
|
|
<table class="memname">
|
||
|
|
<tr>
|
||
|
|
<td class="memname">std::vector<Triangle3D> vde::spatial::BVH::query_ray </td>
|
||
|
|
<td>(</td>
|
||
|
|
<td class="paramtype">const Ray3Dd & </td>
|
||
|
|
<td class="paramname"><em>ray</em></td><td>)</td>
|
||
|
|
<td> const</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</td>
|
||
|
|
<td class="mlabels-right">
|
||
|
|
<span class="mlabels"><span class="mlabel">override</span><span class="mlabel">virtual</span></span> </td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div><div class="memdoc">
|
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<p>射线查询：返回所有命中的三角形 </p>
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<p>深度优先遍历，收集所有与射线相交的叶节点三角形。 复杂度 O(log n + k)。</p>
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<dl class="params"><dt>参数</dt><dd>
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<table class="params">
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<tr><td class="paramname">ray</td><td>查询射线 </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>返回</dt><dd>按命中顺序排列的三角形列表 </dd></dl>
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<p>实现了 <a class="el" href="classvde_1_1spatial_1_1SpatialIndex.html#ac3bd96db5d118856a25081d9b8820225">vde::spatial::SpatialIndex< Triangle3D ></a>.</p>
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</div>
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</div>
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<a id="ad7db451c3765fc5d43f67c7b5be1ebea"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#ad7db451c3765fc5d43f67c7b5be1ebea">◆ </a></span>query_ray_nearest()</h2>
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<tr>
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<td class="memname">std::optional<<a class="el" href="structvde_1_1spatial_1_1BVH_1_1HitResult.html">HitResult</a>> vde::spatial::BVH::query_ray_nearest </td>
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<td>(</td>
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<td class="paramtype">const Ray3Dd & </td>
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<td class="paramname"><em>ray</em></td><td>)</td>
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<td> const</td>
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</tr>
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</table>
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</div><div class="memdoc">
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<p>射线最近命中查询 </p>
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<p>遍历 BVH，维护当前最近 t 值进行剪枝， 返回射线方向上第一个命中的三角形。 典型复杂度 O(log n)。</p>
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<dl class="params"><dt>参数</dt><dd>
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<table class="params">
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<tr><td class="paramname">ray</td><td>查询射线 </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>返回</dt><dd>最近命中结果（若无命中则返回空）</dd></dl>
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<dl class="section note"><dt>注解</dt><dd>比 <a class="el" href="classvde_1_1spatial_1_1BVH.html#a99e4ff172513e51223eda759d24cf5a4" title="射线查询：返回所有命中的三角形">query_ray()</a> 更高效，仅返回最近命中</dd></dl>
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<div class="fragment"><div class="line"><span class="keywordflow">if</span> (<span class="keyword">auto</span> hit = bvh.query_ray_nearest(ray)) {</div>
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<div class="line"> std::cout << <span class="stringliteral">"Hit at t="</span> << hit->t << <span class="stringliteral">", point="</span> << hit->point << <span class="stringliteral">"\n"</span>;</div>
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<div class="line">}</div>
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</div><!-- fragment -->
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</div>
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<a id="a3b6f76186507b3dd44fe18a8be63b8c1"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a3b6f76186507b3dd44fe18a8be63b8c1">◆ </a></span>remove()</h2>
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<td class="memname">bool vde::spatial::BVH::remove </td>
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<td>(</td>
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<td class="paramtype">const Triangle3D & </td>
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<td class="paramname"><em>tri</em></td><td>)</td>
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<td></td>
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</tr>
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</table>
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</td>
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<td class="mlabels-right">
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<span class="mlabels"><span class="mlabel">override</span><span class="mlabel">virtual</span></span> </td>
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</table>
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</div><div class="memdoc">
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<p>删除三角形 </p>
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<dl class="params"><dt>参数</dt><dd>
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<table class="params">
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<tr><td class="paramname">tri</td><td>要删除的三角形 </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>返回</dt><dd>删除成功返回 true </dd></dl>
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<p>实现了 <a class="el" href="classvde_1_1spatial_1_1SpatialIndex.html#a135664f598eae21a922ceead3a60d5ab">vde::spatial::SpatialIndex< Triangle3D ></a>.</p>
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</div>
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</div>
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<a id="ad7fa14f4a51abeb82673b8846479ed46"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#ad7fa14f4a51abeb82673b8846479ed46">◆ </a></span>size()</h2>
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<div class="memitem">
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<div class="memproto">
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<td class="memname">size_t vde::spatial::BVH::size </td>
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<td>(</td>
|
||
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<td class="paramname"></td><td>)</td>
|
||
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<td> const</td>
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</tr>
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</table>
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</td>
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<td class="mlabels-right">
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<span class="mlabels"><span class="mlabel">inline</span><span class="mlabel">override</span><span class="mlabel">virtual</span></span> </td>
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</tr>
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</table>
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</div><div class="memdoc">
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<p>三角形数量 </p>
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<dl class="section return"><dt>返回</dt><dd>当前索引的三角形总数 </dd></dl>
|
||
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||
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<p>实现了 <a class="el" href="classvde_1_1spatial_1_1SpatialIndex.html#ae972c151054589684f24b53ec08a99d1">vde::spatial::SpatialIndex< Triangle3D ></a>.</p>
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<p class="definition">在文件 <a class="el" href="bvh_8h_source.html">bvh.h</a> 第 <a class="el" href="bvh_8h_source.html#l00150">150</a> 行定义.</p>
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</div>
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</div>
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<hr/>该类的文档由以下文件生成:<ul>
|
||
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<li>include/vde/spatial/<a class="el" href="bvh_8h_source.html">bvh.h</a></li>
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</ul>
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</div><!-- contents -->
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</div><!-- doc-content -->
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<!-- start footer part -->
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<div id="nav-path" class="navpath"><!-- id is needed for treeview function! -->
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<ul>
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<li class="navelem"><a class="el" href="namespacevde.html">vde</a></li><li class="navelem"><a class="el" href="namespacevde_1_1spatial.html">spatial</a></li><li class="navelem"><a class="el" href="classvde_1_1spatial_1_1BVH.html">BVH</a></li>
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<li class="footer">生成于 2026年 七月 24日 星期五 11:21:23 , 为 ViewDesignEngine使用 <a href="https://www.doxygen.org/index.html"><img class="footer" src="doxygen.svg" width="104" height="31" alt="doxygen"/></a> 1.9.1 </li>
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</body>
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</html>
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