如何绘制边框以突出显示SCNNode并向用户指示该节点已被选中？
在我的项目中,用户可以放置多个虚拟对象,用户可以随时选择任何对象.选择后,我应该向用户显示高亮显示的3D对象.有没有办法直接实现这个或在SCNNode上绘制边框？
在我的项目中,用户可以放置多个虚拟对象,用户可以随时选择任何对象.选择后,我应该向用户显示高亮显示的3D对象.有没有办法直接实现这个或在SCNNode上绘制边框？
解决方法
您需要向sceneView添加点击手势识别器.
// add a tap gesture recognizer let tapGesture = UITapGestureRecognizer(target: self,action: #selector(handleTap(_:))) scnView.addGestureRecognizer(tapGesture)
然后,处理点击并突出显示节点：
@objc
func handleTap(_ gestureRecognize: UIGestureRecognizer) {
// retrieve the SCNView
let scnView = self.view as! SCNView
// check what nodes are tapped
let p = gestureRecognize.location(in: scnView)
let hitResults = scnView.hitTest(p,options: [:])
// check that we clicked on at least one object
if hitResults.count > 0 {
// retrieved the first clicked object
let result = hitResults[0]
// get its material
let material = result.node.geometry!.firstMaterial!
// highlight it
SCNTransaction.begin()
SCNTransaction.animationDuration = 0.5
// on completion - unhighlight
SCNTransaction.completionBlock = {
SCNTransaction.begin()
SCNTransaction.animationDuration = 0.5
material.emission.contents = UIColor.black
SCNTransaction.commit()
}
material.emission.contents = UIColor.red
SCNTransaction.commit()
}
}
