【cocos creator】2.x里，使用3D射线碰撞检测
注意点：
1、开启射线检测
cc.director.getPhysics3DManager().enabled = true;
2: 响应射线的物体要加3D碰撞盒 BoxCollider3D
3:响应射线的物体分组group要设置为3D，分组管理里需要勾选3D和3D的碰撞
demo下载：
https://download.csdn.net/download/K86338236/89527924
const { ccclass, property } = cc._decorator;@ccclass
export default class CameraTouchCtrl extends cc.Component {@property(cc.Camera)camera: cc.Camera = null;//3D相机@property(cc.Node)touchNode: cc.Node = null;//2D触摸节点start() {//开启射线检测cc.director.getPhysics3DManager().enabled = true;this.touchNode.on(cc.Node.EventType.TOUCH_START, this.onTouchStart, this);}/**检测射线 */onTouchStart(event) {let touchLoc = event.touch.getLocation();let ray = this.camera.getComponent(cc.Camera).getRay(touchLoc);let maxDistance = 1000;//检测的最远距离，如果物体远，需要改大数值let rayColliderGroupName = "3D";//碰撞分组，分组管理里需要勾选3D和3D动碰撞//响应射线的物体要加3D碰撞盒 BoxCollider3D，分组group设置为3Dconst result = cc.director.getPhysics3DManager().raycastClosest(ray, rayColliderGroupName, maxDistance, false);if (result) {let box = result.collider.nodebox.scale += 0.01}}
}