ARFace.swift

class EmojiNode: SCNNode {
  
  var options: [String]
  var index = 0
  
  init(with options: [String], width: CGFloat = 0.06, height: CGFloat = 0.06) {
    self.options = options
    
    super.init()
    
    let plane = SCNPlane(width: width, height: height)
    plane.firstMaterial?.diffuse.contents = (options.first ?? " ").image()
    plane.firstMaterial?.isDoubleSided = true
    
    geometry = plane
  }
}

extension String {
  
  func image() -> UIImage? {
    
    let size = CGSize(width: 20, height: 22)
    
    UIGraphicsBeginImageContextWithOptions(size, false, 0)
    UIColor.clear.set()
    
    let rect = CGRect(origin: .zero, size: size)
    UIRectFill(CGRect(origin: .zero, size: size))
    
    (self as AnyObject).draw(in: rect, withAttributes: [.font: UIFont.systemFont(ofSize: 15)])
    
    let image = UIGraphicsGetImageFromCurrentImageContext()
    
    UIGraphicsEndImageContext()
    
    return image
  }
}