intersectsConvexHull是一个在3D空间检查射线和凸壳体是否相交的函数。这是一个计算几何学问题,可以通过该函数解决。
该函数参数包括:
origin
- 一个向量,描述射线的起点direction
- 一个向量,描述射线的方向points
- 一个数组,其中包含凸壳体的所有点该函数返回一个布尔值,表示射线是否与凸壳体相交。
在计算过程中,该函数使用了Mӧller-Trumbore相交算法,该算法被广泛用于计算机图形学中的光线跟踪。
// 创建射线
var origin = new THREE.Vector3(0, 0, 0);
var direction = new THREE.Vector3(0, 0, -1);
var ray = new THREE.Ray(origin, direction);
// 创建凸壳体
var points = [
new THREE.Vector3(-1, -1, -1),
new THREE.Vector3(-1, -1, 1),
new THREE.Vector3(-1, 1, -1),
new THREE.Vector3(-1, 1, 1),
new THREE.Vector3(1, -1, -1),
new THREE.Vector3(1, -1, 1),
new THREE.Vector3(1, 1, -1),
new THREE.Vector3(1, 1, 1)
];
var geometry = new THREE.ConvexGeometry(points);
// 检查是否相交
var isIntersect = ray.intersectsConvexHull(geometry);
console.log(isIntersect);