74 lines
1.8 KiB
Markdown
74 lines
1.8 KiB
Markdown
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## 射线与模型碰撞
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### 原理：检测一条射线是否穿透一个模型。
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* 未碰撞：
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* 碰撞：
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### api（egret3d.Bound）:
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* 射线与模型具体数据相交
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~~~
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IntersectMesh ( verticesData :Array, indexData :Array, offset :number, faces :number, uv_offset :number, mMat :egret3d.Matrix4_4, result :egret3d.PickResult ):boolean
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~~~
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* verticesData:Array — 检测的模型的顶点数据
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* indexData:Array — 检测的模型的索引数据
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* offset:number — 每个顶点的大小
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* faces:number — 模型面数
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* uv_offset:number — 模型顶点中UV的偏移
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* mMat:egret3d.Matrix4_4 — 顶点的世界变换矩阵
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* result:egret3d.PickResult — 相交相关数据
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* 射线与模型对象相交
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~~~
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IntersectMeshEx ( renderItem :egret3d.IRender, uv_offset :number, result :egret3d.PickResult ):boolean
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~~~
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* renderItem:egret3d.IRender — 检测的模型
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* uv_offset:number — 模型顶点中UV的偏移
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* result:egret3d.PickResult — 相交相关数据
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* 射线与三角形相交
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~~~
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IntersectTriangle ( v0 :egret3d.Vector3D, v1 :egret3d.Vector3D, v2 :egret3d.Vector3D, ret :Array ):boolean
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~~~
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* v0:egret3d.Vector3D — 三角形的第一个顶点
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* v1:egret3d.Vector3D — 三角形的第二个顶点
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* v2:egret3d.Vector3D — 三角形的第三个顶点
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* ret:Array — t(交点到射线起始点的距离) u(交点在v1-v0上的投影的位置) v(交点在v1-v2上的投影的位置, 交点为ret=v0+pU*(v1-v0)+pV*(v2-v0))
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### 示例：
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```
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var pickResult:egret3d.PickResult = new egret3d.PickResult();
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var result:boolean = ray.IntersectMeshEx(cube, 1, pickResult);
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```
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```
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* ray：射线
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* cube：一个包围盒
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* IntersectMeshEx：检测方法
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* pickResult：相交相关数据
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* result： 是否碰撞，true 碰撞，false 未碰撞
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```
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