SCNNode SCNAction.move(to:)没有运行但被调用 - Swift

Question

我的目的是在一个场景中随机移动一个边界区域内的居民，每3秒改变SCNVector3的x、y、z位置，然后将节点移动到这些点。每3秒改变SCNVector3的x、y和z位置，然后节点移动到这些点。

我遇到的问题是节点没有移动到这些点。这些点的变化可以在 print("running: x\(self.x) y\(self.y) z\(self.z) on - \(node.name!)") 行。我假设 SCNAction.move(to:) 动作被调用，但不知为什么这一行什么也没做。

没有抛出任何错误，节点只是在随机的点上产卵，从未移动。

这是我实现当前运动的代码。

    var x = Float.random(in: -0.25...0.265)
    var y:Float = 0
    var z = Float.random(in: -0.3...0.215)

    func spawnInhabitants() {
        let type = skyBalls[_index].getInhabitantType().rawValue
        let scene = SCNScene(named: "art.scnassets/inhabitants/\(type).scn")!
        let inhabitantNode:SCNNode = scene.rootNode.childNode(withName: type, recursively: false)!
        inhabitantNode.scale = SCNVector3(0.000075, 0.000075, 0.000075)
        inhabitantNode.physicsBody?.physicsShape = SCNPhysicsShape(node: inhabitantNode)
        inhabitantNode.physicsBody?.type = .dynamic
        inhabitantNode.physicsBody?.isAffectedByGravity = false
        inhabitantNode.physicsBody?.categoryBitMask = 1
        inhabitantNode.physicsBody?.collisionBitMask = 6
        inhabitantNode.physicsBody?.contactTestBitMask = 1
        for inhab in skyBalls[_index].getInhabitants() {
            x = Float.random(in: -0.25...0.265)
            y = 0
            z = Float.random(in: -0.3...0.215)
            inhabitantNode.position = SCNVector3(x, y, z)
            let move_around = SCNAction.run { node in
                self.x = Float.random(in: -0.25...0.265)
                self.y = 0
                self.z = Float.random(in: -0.3...0.215)
                print("running: x\(self.x) y\(self.y) z\(self.z) on - \(node.name!)")
            }
            let move = SCNAction.move(to: SCNVector3(x, y, z), duration: 3) //<- This is the problem 
            let seq = SCNAction.sequence([move_around, move])
            let i = skyBalls[_index].getInhabitants().firstIndex(of: inhab)
            inhabitantNode.name = "\(type)\(i!)"
            inhabitantNode.runAction(SCNAction.repeatForever(seq))
            colonyScene.rootNode.addChildNode(inhabitantNode.copy() as! SCNNode)
        }
    }

作为一个说明:

skyBalls[_index].getInhabitantType().rawValue 

^返回一个居民的枚举类型的字符串(主要用于命名)

skyBalls[_index].getInhabitants()

返回skyBalls实例中的居民列表和一个索引，更确切地说，是居民的数组。

colonyScene

^这是视图的SCNScene。

先谢谢你。

Answer 1

你的移动动作可能在创建动作时使用x、y、z值。所以你可以尝试在生成随机值后，在运行动作内部创建一个新的动作......。(我简化了你的代码片段来测试这种方法)

    for inhab in skyBalls {
        inhab.position = SCNVector3(x, y, z)
        let move_around = SCNAction.run { node in
            self.x = Float.random(in: -0.25...0.265)
            self.y = 0
            self.z = Float.random(in: -0.3...0.215)
            print("running: x\(self.x) y\(self.y) z\(self.z) on - \(node.name)")
            let moveAction = SCNAction.move(to: SCNVector3(self.x, self.y, self.z), duration: 3)
            node.runAction(moveAction)
        }
        let wait = SCNAction.wait(duration: 3) // make same as moveAction duration
        //let move = SCNAction.move(to: SCNVector3(x, y, z), duration: 3) //<- This is the problem
        let seq = SCNAction.sequence([move_around, wait])
        inhab.runAction(SCNAction.repeatForever(seq))
        scnView.scene!.rootNode.addChildNode(inhab)
    }

希望能帮到你