AVImageDetection.swift

   func renderer(_ renderer: SCNSceneRenderer, nodeFor anchor: ARAnchor) -> SCNNode? {
        let node = SCNNode()
        if let imageAnchor = anchor as? ARImageAnchor {
            let plane = SCNPlane(width: imageAnchor.referenceImage.physicalSize.width, height: imageAnchor.referenceImage.physicalSize.height)
            plane.firstMaterial?.diffuse.contents = UIColor(white: 1, alpha: 0.8)
            let material = SCNMaterial()
            material.diffuse.contents = viewObj
            plane.materials = [material]
            let planeNode = SCNNode(geometry: plane)
            planeNode.eulerAngles.x = -.pi / 2
            node.addChildNode(planeNode)
        }
        return node
    }