SceneKit下降节点移动迅速

sceneView.scene = scene
cameraOrbit = SCNNode()
cameraNode = SCNNode()
camera = SCNCamera()
// camera stuff
camera.usesOrthographicProjection = true
camera.orthographicScale = 5
camera.zNear = 1
camera.zFar = 100
cameraNode.position = SCNVector3(x: 0, y: 0, z: 70)
cameraNode.camera = camera
cameraOrbit = SCNNode()
cameraOrbit.addChildNode(cameraNode)
scene.rootNode.addChildNode(cameraNode)
let sphere = SCNSphere(radius: 2)
sphere.firstMaterial?.diffuse.contents = UIColor.red
let earthNode = SCNNode(geometry: sphere)
earthNode.name = "sphere"
earthNode.geometry?.materials = [blueMaterial]
scene.rootNode.addChildNode(earthNode)
earthNode.rotation = SCNVector4(0, 1, 0, 0)
let lightNode = SCNNode()
let light = SCNLight()
light.type = .ambient
light.intensity = 200
lightNode.light = light
scene.rootNode.addChildNode(lightNode)
sceneView.allowsCameraControl = true
sceneView.backgroundColor = UIColor.clear
sceneView.cameraControlConfiguration.allowsTranslation = true
sceneView.cameraControlConfiguration.rotationSensitivity = 0.4

//**************************************************************************
// Gesture Recognizers
// MARK: Gesture Recognizers
//**************************************************************************
@objc func handleTap(recognizer: UITapGestureRecognizer)
{
if(data.isNavigationOff == true) { return }         // No panel select if Add, Update, EndWave, or EndGame
if(gameMenuTableView.isHidden == false) { return }  // No panel if game menu is showing

let location: CGPoint = recognizer.location(in: gameScene)

if(data.isAirStrikeModeOn == true)
{
let projectedPoint = gameScene.projectPoint(SCNVector3(0, 0, 0))
let scenePoint = gameScene.unprojectPoint(SCNVector3(location.x, location.y, CGFloat(projectedPoint.z)))
gameControl.airStrike(position: scenePoint)
}
else
{
let hitResults = gameScene.hitTest(location, options: hitTestOptions)
for vHit in hitResults
{
if(vHit.node.name?.prefix(5) == "Panel")
{
// May have selected an invalid panel or auto upgrade was on
if(gameControl.selectPanel(vPanel: vHit.node.name!) == false) { return }
return
}
}
}
}
//**************************************************************************
@objc func handlePan(recognizer: UIPanGestureRecognizer)
{
if(data.gameState != .run || data.isGamePaused == true) { return }

currentLocation = recognizer.location(in: gameScene)

switch recognizer.state
{
case UIGestureRecognizer.State.began:
beginLocation = recognizer.location(in: gameScene)
break
case UIGestureRecognizer.State.changed:
if(currentLocation.x > beginLocation.x * 1.1)
{
beginLocation.x = currentLocation.x
gNodes.camera.strafeLeft()
}
if(currentLocation.x < beginLocation.x * 0.9)
{
beginLocation.x = currentLocation.x
gNodes.camera.strafeRight()
}
break
case UIGestureRecognizer.State.ended:
break
default:
break
}
}

这里有一些例子可能会有所帮助，只需在堆栈搜索栏中搜索这些数字，就可以找到我的答案/例子。

57018359-这篇文章一告诉你如何触摸二维屏幕(点击(并将其转换为三维坐标，你决定深度(z(，就像你想点击屏幕并在三维空间中放置对象一样。

57003908-这篇文章告诉你如何选择一个对象与点击测试(点击(。例如，如果你展示了一个带门的房子的正面并点击它，那么如果你将节点命名为"，该函数就会返回你的门节点；门"；并且在它被触碰时采取了某种行动。然后你可以根据这个位置重新定位你的相机。您需要遍历所有结果，因为可能存在重叠或Z节点

55129224-这篇文章为您提供了创建相机类的快速示例。你可以用它来重新定位你的相机，或者前后移动，等等。

两个手指拖动：

func dragBegins(vRecognizer: UIPanGestureRecognizer)
{
if(data.gameState == .run)
{
if(vRecognizer.numberOfTouches == 2) { dragMode = .strafe }
}
}

class Camera
{
var data = Data.sharedInstance
var util = Util.sharedInstance
var gameDefaults = Defaults()

var cameraEye = SCNNode()
var cameraFocus = SCNNode()

var centerX: Int = 100
var strafeDelta: Float = 0.8
var zoomLevel: Int = 35
var zoomLevelMax: Int = 35              // Max number of zoom levels

//********************************************************************
init()
{
cameraEye.name = "Camera Eye"
cameraFocus.name = "Camera Focus"

cameraFocus.isHidden = true
cameraFocus.position  =  SCNVector3(x: 0, y: 0, z: 0)

cameraEye.camera = SCNCamera()
cameraEye.constraints = []
cameraEye.position = SCNVector3(x: 0, y: 15, z: 0.1)

let vConstraint = SCNLookAtConstraint(target: cameraFocus)
vConstraint.isGimbalLockEnabled = true
cameraEye.constraints = [vConstraint]
}
//********************************************************************
func reset()
{
centerX = 100
cameraFocus.position  =  SCNVector3(x: 0, y: 0, z: 0)
cameraEye.constraints = []
cameraEye.position = SCNVector3(x: 0, y: 32, z: 0.1)
cameraFocus.position = SCNVector3Make(0, 0, 0)

let vConstraint = SCNLookAtConstraint(target: cameraFocus)
vConstraint.isGimbalLockEnabled = true
cameraEye.constraints = [vConstraint]
}
//********************************************************************
func strafeRight()
{
if(centerX + 1 < 112)
{
centerX += 1
cameraEye.position.x += strafeDelta
cameraFocus.position.x += strafeDelta
}
}
//********************************************************************
func strafeLeft()
{
if(centerX - 1 > 90)
{
centerX -= 1
cameraEye.position.x -= strafeDelta
cameraFocus.position.x -= strafeDelta
}
}
//********************************************************************
}

//********************************************************************
func lerp(start: SCNVector3, end: SCNVector3, percent: Float) -> SCNVector3
{
let v3 = cgVecSub(v1: end, v2: start)
let v4 = cgVecScalarMult(v: v3, s: percent)
return cgVecAdd(v1: start, v2: v4)
}