three-dimensional-covert/service/util/BoundingMesh.js

//skybox
import * as THREE from 'three'
export default class BoundingMesh extends THREE.Mesh {
    constructor(boundingBox, material, skyHeight = 50) {
        //boundingBox = boundingBox.clone().expandByScalar(0.01) //许钟文改： 稍微放大了一丢丢的，避免和其他mesh冲突闪烁。尤其在飞入飞出时，地面闪烁一下，好像是和chunk冲突。过去是和marker冲突。
        //大部分没有mesh的都是户外，所以放大些，作为天空盒背景.  另外地板因为可能破损，所以position向上提升使最低高度不变
        boundingBox = boundingBox.clone().expandByVector(new THREE.Vector3(skyHeight, skyHeight, skyHeight))

        var size = new THREE.Vector3()
        boundingBox.getSize(size)
        var geometry = new THREE.BoxGeometry(size.x, size.y, size.z)
        //geometry.boundingBox = boundingBox; //xzw delete 较早：这句加上不对。因为后面算鼠标与skybox交点时 要用到的是boundingbox加上position才是真实skybox真实位置，所以boundingbox要居中的，而不应该是整体模型所在的位置。
        geometry.computeBoundingBox() //需要重新计算对称的bounding， 在获取鼠标交点时需要。否则热点加不上

        super(geometry, material)
        var center = new THREE.Vector3()
        boundingBox.getCenter(center)
        skyHeight && (center.y += skyHeight - 0.1)

        this.position.copy(center)
        this.frustumCulled = !1
        //flag && this.add(new THREE.WireframeHelper(this))
    }
}