移动对象:
执行 hitTest 以检查您触摸的位置,并检测您触摸的平面并获得位置。通过使用 SCNVector3 更改 node.position 值,将 SCNNode 移动到该位置。
代码:
@objc func panDetected(recognizer: UIPanGestureRecognizer){
let hitResult = self.arSceneView.hitTest(loc, types: .existingPlane)
if !hitResult.isEmpty{
guard let hitResult = hitResult.last else { return }
self.yourNode.position = SCNVector3Make(hitResult.worldTransform.columns.3.x, hitResult.worldTransform.columns.3.y, hitResult.worldTransform.columns.3.z)
}
上面的代码足以将您的节点移动到检测到的平面上,在您触摸的任何地方,而不仅仅是在单个轴上。
根据您的手势旋转节点是一项非常艰巨的任务,我已经研究了很长一段时间的解决方案,但从未达到完美的输出。但是,我在 GitHub 中遇到了这个存储库,它可以让您以非常令人印象深刻的结果做到这一点。
https://github.com/Xartec/ScreenSpaceRotationAndPan
使用手势旋转节点所需的 Swift 版本代码是:
var previousLoc: CGPoint?
var touchCount: Int?
@objc func panDetected(recognizer: UIPanGestureRecognizer){
let loc = recognizer.location(in: self.view)
var delta = recognizer.translation(in: self.view)
if recognizer.state == .began {
previousLoc = loc
touchCount = recognizer.numberOfTouches
}
else if gestureRecognizer.state == .changed {
delta = CGPoint.init(x: 2 * (loc.x - previousLoc.x), y: 2 * (loc.y - previousLoc.y))
previousLoc = loc
if touchCount != recognizer.numberOfTouches {
return
}
var rotMatrix: SCNMatrix4!
let rotX = SCNMatrix4Rotate(SCNMatrix4Identity, Float((1.0/100) * delta.y), 1, 0, 0)
let rotY = SCNMatrix4Rotate(SCNMatrix4Identity, Float((1.0 / 100) * delta.x), 0, 1, 0)
rotMatrix = SCNMatrix4Mult(rotX, rotY)
let transMatrix = SCNMatrix4MakeTranslation(yourNode.position.x, yourNode.position.y, yourNode.position.z)
self.yourNode.transform = SCNMatrix4Mult(self.yourNode.transform, SCNMatrix4Invert(transMatrix))
let parentNoderanslationMatrix = SCNMatrix4MakeTranslation((self.yourNode.parent?.worldPosition.x)!, (self.yourNode.parent?.worldPosition.y)!, (self.yourNode.parent?.worldPosition.z)!)
let parentNodeMatWOTrans = SCNMatrix4Mult((self.yourNode.parent?.worldTransform)!, SCNMatrix4Invert(parentNoderanslationMatrix))
self.yourNode.transform = SCNMatrix4Mult(self.yourNode.transform, parentNodeMatWOTrans)
let camorbitNodeTransMat = SCNMatrix4MakeTranslation((self.arSceneView.pointOfView?.worldPosition.x)!, (self.arSceneView.pointOfView?.worldPosition.y)!, (self.arSceneView.pointOfView?.worldPosition.z)!)
let camorbitNodeMatWOTrans = SCNMatrix4Mult((self.arSceneView.pointOfView?.worldTransform)!, SCNMatrix4Invert(camorbitNodeTransMat))
self.yourNode.transform = SCNMatrix4Mult(self.yourNode.transform, SCNMatrix4Invert(camorbitNodeMatWOTrans))
self.yourNode.transform = SCNMatrix4Mult(self.yourNode.transform, rotMatrix)
self.yourNode.transform = SCNMatrix4Mult(self.yourNode.transform, camorbitNodeMatWOTrans)
self.yourNode.transform = SCNMatrix4Mult(self.yourNode.transform, SCNMatrix4Invert(parentNodeMatWOTrans))
self.yourNode.transform = SCNMatrix4Mult(self.yourNode.transform, transMatrix)
}
}