3d ARKit绘制带圆角的三维纸平面

我试图在ARKit中绘制带有圆角的3D纸平面，但我做不到

我用bazier path做的：

    // create bezeir path
    let path  = UIBezierPath()
   
    // A bezier path
    path.move(to: CGPoint(x: 0, y: 0.025))
    path.addLine(to: CGPoint(x: 0.02, y: -0.005))
    path.addLine(to: CGPoint(x: 0, y: 0))
    path.addLine(to: CGPoint(x: -0.02, y: -0.005))
    path.close()
     
    // create arrow shape
    let arrowShape = SCNShape(path: path, extrusionDepth: 0.001)
    arrowShape.chamferRadius = 50
  
    // create new node
    arrownode = SCNNode(geometry: arrowShape);
       
    // set arrow color
    arrownode!.geometry?.firstMaterial?.diffuse.contents = UIColor.yellow 

结果是：

---

我需要像这样精确，但具有圆角。

实例属性

chamferRadius

为拉伸zDepth而不是XY路径创建倒角

let arrowShape = SCNShape(path: path, extrusionDepth: 0.005)
arrowShape.chamferRadius = 20

如果要创建圆角，请对路径使用以下方法：

path.addQuadCurve(to: CGPoint, controlPoint: CGPoint)

或

path.addCurve(to: CGPoint, controlPoint1: CGPoint, controlPoint2: CGPoint)