如何将SCNPlane颜色更改为透明颜色

Question

我正在开发一个ARKit项目，当在水平平面上点击时，它需要波纹动画效果。为此，我采用了UIView对象并将其作为SCNPlane对象材料的内容传递。我已将Ripple动画添加到UIView对象。一切正常。但是我无法将SCNPlane颜色更改为透明颜色。我可以为材料使用透明度属性。但是它也隐藏了Ripple动画。因此，我在这里需要的是SCNPlane对象的背景颜色应该是透明的，并且只有波纹动画可以显示给用户。有人可以帮我吗。

这是我的代码。

    let location = tapGesture.location(in: self.sceneView)
    let results = self.sceneView.hitTest(location, types: .existingPlane)
    if !results.isEmpty{

        guard let result = results.first else{ return }
        let myUIView = UIView(frame: CGRect(origin: .zero, size: CGSize(width: 300, height: 300)))
        myUIView.backgroundColor = .red
        let plane = SCNPlane(width: 1.0, height: 1.0)
        plane.firstMaterial?.diffuse.contents = myUIView
        let planeViewNode = SCNNode(geometry: plane)
        planeViewNode.eulerAngles.x = Float(-Double.pi / 2)
        planeViewNode.position = SCNVector3(result.worldTransform.columns.3.x, result.worldTransform.columns.3.y, result.worldTransform.columns.3.z)

        self.sceneView.scene.rootNode.addChildNode(planeViewNode)

        //Ripple animation code goes here 
    }

I took screenshot from Civilisations AR app from BBC. Please refer the screenshot by clicking this link. This is how exactly I need.

Answer 1

查看此答案：How to render a UIView with transparent background on an SCNPlane in ARKit?。设置UiView isOpaque false对我有用。