ViewController中的Sprite粒子系统动画 [英] Sprite Particle System animation in viewController

问题描述

我创建了一个macOS单窗口应用程序，并添加了一个模板为 Stars 的Sprite Particle System文件。并具有如下视觉效果：

我想将其添加到我的viewController中，

所以，我想知道怎么了以及我该怎么办？

这是演示仓库：链接此处

粒子系统本身是Xcode中提供的标准星型 SceneKit粒子系统，没有任何更改。

解决方案

我取得了一些进展。如果我将摄像机旋转180度，则可以看到恒星正在后退，因此我们可以判断粒子系统运行正常。在默认方向上，我所看到的只是闪烁的灯光。因此，我认为粒子的Z位置与相机的位置相同，为0。

如果我将系统的节点移离相机

  particleNode.position = SCNVector3（0，0，-20）
  

我仍然只看到闪烁的灯光。但是，如果我单击SCNView，动画将正常工作。我看到星星向我冲来。

我不明白为什么我必须单击视图才能使其正常工作。我试过 isPlaying = true ，但这没什么区别。

I create a macOS single window application and add a Sprite Particle System file with template Stars. and the visual effect just like this:

And I want to add it to my viewController, as the guide of this answer, I got the result like this, and it was not which I desired:

    override func viewDidLoad() {
        super.viewDidLoad()

        let scene = SCNScene()
        let particlesNode = SCNNode()
        let particleSystem = SCNParticleSystem(named: "Welcome", inDirectory: "")
        particlesNode.addParticleSystem(particleSystem!)
        scene.rootNode.addChildNode(particlesNode)
        skView.backgroundColor = .black
        skView.scene = scene
    }

So, I'm wondering what's wrong and what should I do?

Here is the demo repo: Link Here

The particle system itself is the standard "star" SceneKit particle system available in Xcode, with no changes.

解决方案

Well I made a little progress. If I swivel the camera around 180 degrees, I can see the stars receding, so we can tell that the particle system is running ok. In the default orientation, though, all I saw was blinking lights. So I think the particles are being generated with a Z position of 0, the same as the camera's.

If I move the system's node away from the camera

    particlesNode.position = SCNVector3(0, 0, -20)

I still just see blinking lights. But if I click on the SCNView, the animation works correctly. I see stars coming at me.

I don't understand why I have to click the view to get it to work right. I tried isPlaying = true but that made no difference.

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