如何将SCNAnimationPlayer“裁剪”为特定的开始和结束时间,iOS 11

概述我有一个带有长动画的.dae模型.动画包括步行,跑步,击球,死亡等部分.我知道每个部分的开始和结束的帧数.我也知道每秒帧速率.因此,获取每个细分的开始和结束时间非常简单. 我可以将完整的动画作为SCNAnimationPlayer对象.我一直在尝试的是制作完整动画的副本,然后设置动画的timeOffset和持续时间. let walkPlayer = fullPlayer.copy() as! S 我有一个带有长动画的.dae模型.动画包括步行,跑步,击球,死亡等部分.我知道每个部分的开始和结束的帧数.我也知道每秒帧速率.因此,获取每个细分的开始和结束时间非常简单.

我可以将完整的动画作为SCNAnimationPlayer对象.我一直在尝试的是制作完整动画的副本,然后设置动画的timeOffset和持续时间.

let walkPlayer = fullPlayer.copy() as! SCNAnimationPlayerwalkPlayer.stop()walkPlayer.animation.timeOffset = walk.offsetwalkPlayer.animation.duration = walk.duration

然后我将walkPlayer添加回Bip01节点(我从中获得了完整的动画).

我可以通过调用animationPlayer(forKey：“walk”)来轻松地完成游戏.？play()

我可以很容易地改变动画的持续时间和其他方面.但是动画总是从第0帧开始.无论我放入什么值.timeOffset,它都会被忽略.

如何从SCNAnimationPlayer中的SCNAnimation的起始帧到结束帧进行播放？

解决方法 关键是寻找

CAAnimation(scnAnimation: animation)

和

SCNAnimation(caAnimation: animation)

一旦我找到了这些,我就可以使用CAAnimationGroup来“裁剪”完整的动画.

这是我正在研究的Troll.swift.当然,有很多工作要做,但现在我至少可以让可怜的野兽走路而死.

class Troll: SCNNode {    var body:SCNNode!    static func timeRange(forStartingAtFrame start:Int,endingAtFrame end:Int,fps:Double = 30) -> (offset:TimeInterval,duration:TimeInterval) {        let startTime   = self.time(atFrame: start,fps: fps) //TimeInterval(start) / fps        let endTime     = self.time(atFrame: end,fps: fps) //TimeInterval(end) / fps        return (offset:startTime,duration:endTime - startTime)    }    static func time(atFrame frame:Int,fps:Double = 30) -> TimeInterval {        return TimeInterval(frame) / fps    }    static func animation(from full:CAAnimation,startingAtFrame start:Int,fps:Double = 30) -> CAAnimation {        let range = self.timeRange(forStartingAtFrame: start,endingAtFrame: end,fps: fps)        let animation = CAAnimationGroup()        let sub = full.copy() as! CAAnimation        sub.timeOffset = range.offset        animation.animations = [sub]        animation.duration = range.duration        return animation    }    func load() {        guard let trollScene = SCNScene(named: "Models.scnassets/troll/troll.dae") else {            fatalError("Can't load the scene")        }        guard let troll_body = trollScene.rootNode.childNode(withname: "troll",recursively: true) else {            fatalError( "found no troll")        }        guard let troll_weapon = trollScene.rootNode.childNode(withname: "troll_weapon",recursively: true) else {            fatalError( "found no troll_weapon")        }        guard let troll_bracelet = trollScene.rootNode.childNode(withname: "troll_bracelet",recursively: true) else {            fatalError( "found no troll_bracelet")        }        guard let bips = trollScene.rootNode.childNode(withname: "Bip01",recursively: true) else {            fatalError( "found no Bip01")        }        guard let fullKey = bips.animationKeys.first else {            fatalError( "Bip01 got no animation")        }        guard let fullPlayer = bips.animationPlayer(forKey: fullKey) else {            fatalError( "Bip01 got no player for \(fullKey)")        }        let fullAnimation = CAAnimation(scnAnimation: fullPlayer.animation)        self.addChildNode(troll_body)        self.addChildNode(troll_weapon)        self.addChildNode(troll_bracelet)        self.addChildNode(bips)        self.body = bips        self.body.removeAllAnimations()        let walkAnimation = Troll.animation(from: fullAnimation,startingAtFrame: 10,endingAtFrame: 60)        walkAnimation.repeatCount = .greatestFiniteMagnitude        walkAnimation.fadeInDuration = 0.3        walkAnimation.fadeOutDuration = 0.3        let walkPlayer = SCNAnimationPlayer(animation: SCNAnimation(caAnimation: walkAnimation))        self.body.addAnimationPlayer(walkPlayer,forKey: "walk")        let deathAnimation = Troll.animation(from: fullAnimation,startingAtFrame: 1810,endingAtFrame: 1850)        deathAnimation.isRemovedOnCompletion = false        deathAnimation.fadeInDuration = 0.3        deathAnimation.fadeOutDuration = 0.3        let deathPlayer = SCNAnimationPlayer(animation: SCNAnimation(caAnimation: deathAnimation))        self.body.addAnimationPlayer(deathPlayer,forKey: "death")        self.scale     = SCNVector3(0.1,0.1,0.1)    }    func walk() {        print( "+++ walk +++" )        self.body.animationPlayer(forKey: "walk")?.play()    }    func death() {        print( "+++ death +++" )        self.body.animationPlayer(forKey: "walk")?.stop(withBlendOutDuration: 0.3)        self.body.animationPlayer(forKey: "death")?.play()    }}

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