//new THREE.Vector3()得到的数据赋值给三维空向量
let center = geomertry.getCenter(new THREE.Vector3())
包围球和包围球辅助器
let sp = geomertry.boundingSpere //获取包围球
sp.applyMatrix4(duckMesh.matrixWorld)let spereGeo = new THREE.SphereGeomertry(sp.center, 16,16)//创建包围球辅助器
let spereMat = new THREE.MeshBasicMaterial({color: 0xff0000, wireframe: true})let spereMesh = new THREE.Mesh(spereGeo,spereMat)
spereMesh.position.copy(geomertry.center)
scene.add(spereMesh)
6、获取多物体包围盒
//arr 是几何体数组
let box = new THREE.Box3()let box3 = new THREE.Box3().setFromObject(arr)
box.union(nox3) //联合几个包围盒计算