如何为 SCNNode 创建边框以指示其在 iOS 11 ARKit-Scenekit 中的选择? [英] How to create a border for SCNNode to indicate its selection in iOS 11 ARKit-Scenekit?
问题描述
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,我应该向用户显示突出显示的 3D 对象.有没有办法直接实现这个或在 SCNNode 上画一个边界?
How to draw a border to highlight a SCNNode and indicate to user that the node is selected? In my project user can place multiple virtual objects and user can select any object anytime. Upon selection i should show the user highlighted 3D object. Is there a way to directly achieve this or draw a border over SCNNode?
推荐答案
您需要向 sceneView
添加点击手势识别器.
You need to add a tap gesture recognizer to the sceneView
.
// 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:
Then, handle the tap and highlight the node:
@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()
}
}
上面的代码片段突出显示了整个节点.如果这是您要查找的内容,则必须对其进行调整以仅突出显示边框.
The snippet above highlights the whole node. You'd have to adjust it to highlight the borders only, if that's what you're looking for.
免责声明:
此代码直接取自在打开新游戏 (SceneKit
) 项目时创建的 Xcode 模板代码.
Disclaimer:
This code was taken directly from Xcode's template code created when opening a new game (SceneKit
) project.
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