47 lines
890 B
Markdown
47 lines
890 B
Markdown
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## 模型与点碰撞
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### 原理：
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* 检测模型与点碰撞其实就是检测一个点是否在模型内。在 egret3d 中，模型与点碰撞，是通过模型的 bound 来检测是否包含这个点（egret3d.Vector3D）来实现。
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这里为了更好的理解，我们将“点“想象成一个稍微大些的球。
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* 未碰撞：
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* 碰撞：
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### api（egret3d.Bound）:
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~~~
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pointIntersect ( pos :egret3d.Vector3D ):boolean
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~~~
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~~~
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pos:egret3d.Vector3D — 检测的点
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~~~
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### 示例：
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```
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var vector3d:egret3d.Vector3D = new egret3d.Vector3D(ball.x, ball.y, ball.z);
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var result:boolean = cube.bound.pointIntersect(vector3d);
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```
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```
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* cube：一个模型
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* bound：模型的数据
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* pointIntersect：检测方法
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* vector3d： 点的数据
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* result： 是否碰撞，true 碰撞，false 未碰撞
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```
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