parameter collision 碰撞参数
For planar target, the sheath thickness becomes smaller as collision parameter increases.
对于平板鞘层，结果表明随着碰撞参数的增大，鞘层厚度明显地变小。
The second parameter is the scene node, which is the object, which is affected by collision detection, in our case it is the camera.
第二个参数是场景结点，指定受碰撞检测影响的对象，在我们的例子中就是相机。
The first parameter is the TriangleSelector, which specifies how the world, against collision detection is done looks like.
第一个参数是TriangleSelector，指明碰撞检测完成后世界看起来是个什么样子。
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