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126 lines
4.2 KiB
126 lines
4.2 KiB
<!DOCTYPE html>
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<html lang="zh">
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<head>
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<meta charset="utf-8" />
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<base href="../../../" />
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<script src="page.js"></script>
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<link type="text/css" rel="stylesheet" href="page.css" />
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</head>
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<body>
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[page:Mesh] →
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<h1>实例化网格（[name]）</h1>
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<p class="desc">
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一种具有实例化渲染支持的特殊版本的[page:Mesh]。你可以使用 [name] 来渲染大量具有相同几何体与材质、但具有不同世界变换的物体。
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使用 [name] 将帮助你减少 draw call 的数量，从而提升你应用程序的整体渲染性能。
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</p>
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<h2>示例</h2>
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<p>
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[example:webgl_instancing_dynamic WebGL / instancing / dynamic]<br />
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[example:webgl_instancing_performance WebGL / instancing / performance]<br />
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[example:webgl_instancing_scatter WebGL / instancing / scatter]<br />
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[example:webgl_instancing_raycast WebGL / instancing / raycast]
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</p>
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<h2>构造函数</h2>
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<h3>[name]( [param:BufferGeometry geometry], [param:Material material], [param:Integer count] )</h3>
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<p>
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[page:BufferGeometry geometry] - 一个 [page:BufferGeometry] 的实例。<br />
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[page:Material material] - 一个 [page:Material] 的实例。默认为一个新的 [page:MeshBasicMaterial] 。<br />
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[page:Integer count] - 实例的数量<br />
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</p>
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<h2>属性</h2>
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<p>See the base [page:Mesh] class for common properties.</p>
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<h3>[property:Integer count]</h3>
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<p>
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实例的数量。被传入到构造函数中的*count*表示mesh实例数量的最大值。
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你可以在运行时改变这个数值到 [0, count] 区间的一个整数。
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</p>
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<p>
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如果你需要比原先的数量更多的实例数量，你需要创建一个新的[name]。
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</p>
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<h3>[property:InstancedBufferAttribute instanceColor]</h3>
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<p>
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代表所有实例的颜色。默认情况下*null*。
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如果通过[page:.setColorAt]()修改实例化数据，则必须将它的[page:BufferAttribute.needsUpdate needsUpdate]标志设置为 true。
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</p>
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<h3>[property:InstancedBufferAttribute instanceMatrix]</h3>
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<p>
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表示所有实例的本地变换。
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如果你要通过 [page:.setMatrixAt]() 来修改实例数据，你必须将它的 [page:BufferAttribute.needsUpdate needsUpdate] 标识为 true 。
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</p>
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<h3>[property:Boolean isInstancedMesh]</h3>
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<p>
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Read-only flag to check if a given object is of type [name].
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</p>
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<h2>方法</h2>
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<p>See the base [page:Mesh] class for common methods.</p>
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<h3>[method:undefined dispose]()</h3>
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<p>
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Frees the internal resources of this instance.
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</p>
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<h3>[method:undefined getColorAt]( [param:Integer index], [param:Color color] )</h3>
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<p>
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[page:Integer index]: The index of an instance. Values have to be in the range [0, count].
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</p>
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<p>
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[page:Color color]: This color object will be set to the color of the defined instance.
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</p>
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<p>
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Get the color of the defined instance.
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</p>
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<h3>[method:undefined getMatrixAt]( [param:Integer index], [param:Matrix4 matrix] )</h3>
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<p>
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[page:Integer index]: 实例的索引。值必须在 [0, count] 区间。
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</p>
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<p>
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[page:Matrix4 matrix]: 该4x4矩阵将会被设为已定义实例的本地变换矩阵。
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</p>
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<p>
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获得已定义实例的本地变换矩阵。
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</p>
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<h3>[method:undefined setColorAt]( [param:Integer index], [param:Color color] )</h3>
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<p>
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[page:Integer index]: The index of an instance. Values have to be in the range [0, count].
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</p>
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<p>
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[page:Color color]: The color of a single instance.
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</p>
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<p>
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Sets the given color to the defined instance.
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Make sure you set [page:.instanceColor][page:BufferAttribute.needsUpdate .needsUpdate] to true after updating all the colors.
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</p>
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<h3>[method:undefined setMatrixAt]( [param:Integer index], [param:Matrix4 matrix] )</h3>
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<p>
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[page:Integer index]: 实例的索引。值必须在 [0, count] 区间。
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</p>
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<p>
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[page:Matrix4 matrix]: 一个4x4矩阵，表示单个实例本地变换。
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</p>
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<p>
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设置给定的本地变换矩阵到已定义的实例。
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请确保在更新所有矩阵后将 [page:.instanceMatrix][page:BufferAttribute.needsUpdate .needsUpdate] 设置为true。
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</p>
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<h2>源代码</h2>
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<p>
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[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]
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</p>
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</body>
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</html>
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