使用 CAKeyframeAnimation 在 Scenekit 中动画旋转节点

Question

为了研究 ARKit 和 SceneKit，我正在编写一个简单的应用程序，它应该做两件事：

在 3d 世界中放置一架飞机
为这架飞机制作动画，让这架飞机以圆周方式飞行（如果我能让这架飞机以方形路径飞行，我会很高兴）。

现在，我卡在第二点上了，为飞机设置动画。

我尝试了不同的方法但没有成功。

首先尝试：使用“sequanceAction”制作动画，但正如您从以下代码中看到的那样，平面首先移动到旋转 (Yaxes) 的 X，然后移动到 Z（动画非常丑陋）。

func animataAirplane(nodeToAnimate: SCNNode){
    let moveinx = SCNAction.move(to: SCNVector3(nodeToAnimate.position.x + 1,nodeToAnimate.position.y,nodeToAnimate.position.z), duration: 2)
    let rotateRight = SCNAction.rotate(by: deg2rad(-90), around: SCNVector3(0, 1, 0), duration: 1)
    let moveinz = SCNAction.move(to: SCNVector3(nodeToAnimate.position.x + 1,nodeToAnimate.position.y,nodeToAnimate.position.z + 1), duration: 2)
    let sequanceAction = SCNAction.sequence([moveinx, rotateRight, moveinz])
    nodeToAnimate.runAction(sequenceAction)
}

我想要的是过度的动画，几乎在 moveX 动作结束时开始旋转动作和 moveinZ，以给出真实平面转动的错觉。

这可能吗？我正在寻找有人指出正确的方向，我应该看什么。

我的第二种方法是尝试“CAKeyframeAnimation”：

但是我找不到确切的方法来组合这个动画：

func animatePlaneKey(nodeToAnimate: SCNNode){
    let pos = nodeToAnimate.position
    let animation = CAKeyframeAnimation(keyPath: "position")
    let pos1 = SCNVector3(pos.x, pos.y, pos.z)
    let pos2 = SCNVector3(pos.x + 1 , pos.y, pos.z)
    let pos3 = SCNVector3(pos.x + 1 , pos.y, pos.z + 1)

    animation.values = [pos1,pos2, pos3]
    animation.keyTimes = [0,0.5,1]
    animation.calculationMode = .linear
    animation.duration = 10
    animation.repeatCount = 1
    animation.isAdditive = true
            
    let animation2 = CAKeyframeAnimation(keyPath: "rotation")
    let pos1rot = SCNVector3(nodeToAnimate.eulerAngles.x, nodeToAnimate.eulerAngles.y, nodeToAnimate.eulerAngles.z)
    let pos2rot = SCNVector3(nodeToAnimate.eulerAngles.x + Float(deg2rad(90)), nodeToAnimate.eulerAngles.y + Float(deg2rad(90)), nodeToAnimate.eulerAngles.z + Float(deg2rad(90)))
    animation2.values = [pos1rot,pos2rot]
    animation2.keyTimes = [0,1]
    animation2.duration = 2
    animation2.repeatCount = 1
    animation2.isAdditive = true
            
    nodeToAnimate.addAnimation(animation, forKey: "position")
    nodeToAnimate.addAnimation(animation2, forKey: "rotation")
}

如果有人能指出正确的方向来模拟这个飞行动画，我会很高兴。

非常感谢。

Answer 1

这是您的代码的工作版本：

func animatePlaneKey(nodeToAnimate: SCNNode) {

    let pos = nodeToAnimate.position
    let animation = CAKeyframeAnimation(keyPath: "position")
    let pos1 = SCNVector3(pos.x, pos.y, pos.z)
    let pos2 = SCNVector3(pos.x + 1 , pos.y, pos.z)
    let pos3 = SCNVector3(pos.x + 1 , pos.y, pos.z + 1)

    animation.values = [pos1,pos2, pos3]
    animation.keyTimes = [0,0.5,1]
    animation.calculationMode = .linear
    animation.duration = 10
    animation.repeatCount = 1
    animation.isAdditive = true
            
    let animation2 = CAKeyframeAnimation(keyPath: "rotation")
    let pos1rot = SCNVector4(0, 0, 0, 0)
    let pos2rot = SCNVector4(0, 1, 0, CGFloat(Float.pi/2))
    animation2.values = [pos1rot, pos2rot]
    animation2.keyTimes = [0, 1]
    animation2.duration = 20
    animation2.repeatCount = 1
    animation2.isAdditive = true
            
    nodeToAnimate.addAnimation(animation, forKey: "position")
    nodeToAnimate.addAnimation(animation2, forKey: "spin around")
}

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