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<h1 id="terrain-collisions">地形碰撞（Terrain Collisions）</h1>
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<p>此前我们创建了一个地形，接下来就是检测碰撞以避免穿过它。回忆一下之前的内容，一个地形是由地形块组成的，每个地形块都是由高度图生成的，高度图用于设置构成地形的三角形的顶点高度。</p>
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<p>为了检测碰撞，我们必须将当前所在位置的<strong>Y</strong>值与当前地形点的<strong>Y</strong>值进行比较。如果有碰撞，我们需要回到地形上方。很简单的想法，是吗？确实是这样，但在比较之前，我们需要进行几次计算。</p>
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<p>我们首先要定义的是我们对“当前位置”这个词的理解。由于我们还没有一个球员的概念，答案很简单，当前的位置将是相机的位置。因此，我们已经有了比较的组成部分之一，因此，接下来要计算的是当前位置的地形高度。
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首先要定义的是“当前位置”这个词的概念。由于我们还没有一个“玩家”的概念，因此当前位置将是摄像机的位置。这样我们就有了比较的一方，因此接下来要计算当前位置的地形高度。</p>
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<p>如上所是，地形由地形块组成，如下图所示。</p>
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<p>首先要定义的是“当前位置”这个词的概念。由于我们还没有一个“玩家”的概念，当前位置将是摄像机的位置。这样我们就有了比较的一方，因此接下来要计算当前位置的地形高度。</p>
|
||||
<p>如上所述，地形由地形块组成，如下图所示。</p>
|
||||
<p><img alt="地形网格" src="../_static/15/terrain_grid.png" /></p>
|
||||
<p>每个地形块都是由相同的高度图网格构成，但被精确地缩放和位移，以形成看起来像是连续的景观的地形网格。</p>
|
||||
<p>所以首先要做的是确定当前位置(摄像机位置)在哪个地形块。为了得到它，我们将基于位移和缩放来计算每个地形块的包围盒(<strong>BoundingBox</strong>)。因为地形在运行时不会移动或缩放，所以我们可以在<code>Terrain</code>类的构造方法中计算。这样就可以在任何时候访问它们，而不需要在每个游戏循环周期中重复这些计算。</p>
|
||||
@@ -433,31 +413,22 @@ if ( camera.getPosition().y <= height ) {
|
||||
<p>有许多可行的解决方案可以避免这个效应，最简单的解决方法是将要进行的计算分成增量较小的多份。</p>
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@@ -465,11 +436,11 @@ if ( camera.getPosition().y <= height ) {
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