使用touch在SceneKit中移动特定节点 [英] Move a specific node in SceneKit using touch

问题描述

我有一个包含多个节点的场景.我想通过点击它来选择一个节点(如果我什么也没点击，我什么也不想发生)，并使他仅在XY轴(我知道Z轴的位置)上跟随我的手指.是否有任何方法可以将视图中的位置转换为SceneKit坐标?

I have a scene with multiple nodes. I want to select a node by tapping it (if I tap nothing I want nothing to happen) and make him follow my finger only on XY axis (I know position on Z axis). Is there any method that converts location in view to SceneKit coords?

经过几番研究，我发现了这一点，而这正是我想要的，但是我没有得到代码.有人可以向我解释或帮助我确定如何解决我的问题吗? https://www.youtube.com/watch?v=xn9Bt2PFp0g

After few researches I found this and it's exactly what I want, but I don't get the code. Can somebody explain me or help me figure how can I solve my problem? https://www.youtube.com/watch?v=xn9Bt2PFp0g

推荐答案

func CGPointToSCNVector3(view: SCNView, depth: Float, point: CGPoint) -> SCNVector3 {
    let projectedOrigin = view.projectPoint(SCNVector3Make(0, 0, depth))
    let locationWithz   = SCNVector3Make(Float(point.x), Float(point.y), projectedOrigin.z)
    return view.unprojectPoint(locationWithz)
}

看起来很简单，我做了一个获取3个参数的函数. View是附加场景的SCNView，depth是节点的z值，point是CGPoint，表示3D场景在屏幕上的投影.

Looks like was pretty simple, I've made a function that gets 3 parameters. View is the SCNView where scene is attached to, depth is the z value of node, and point is a CGPoint that represents projection of 3D scene on screen.

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