Farini

/**
 A CIFilter that uses a Metal function that converts a black pixel (or almost black) to a transparent pixel.
 */
class BLKTransparent: CIFilter {
    
    private var kernel: CIColorKernel
    
    var inputImage: CIImage?
    var threshold: Float?
    

SceneKit Parabola

import SceneKit

// Set up a SceneKit view
let view = SCNView(frame: CGRect(x: 0, y: 0, width: 300, height: 300))
view.autoenablesDefaultLighting = true
view.scene = SCNScene()
let root = view.scene!.rootNode

// Display it live
import XCPlayground