faceMesh.js

const NativeUI = require('NativeUI')
const Scene = require('Scene')
const Textures = require('Textures')

const plane = Scene.root.find('faceMesh0')

const texture0 = Textures.get('texture0')
const texture1 = Textures.get('texture1')
const texture2 = Textures.get('texture2')

const picker = NativeUI.picker

const index = 0

const configuration = {
  selectedIndex: index,

  items: [
    {image_texture: texture0},
    {image_texture: texture1},
    {image_texture: texture2}
  ]

}

picker.configure(configuration)
picker.visible = true

picker.selectedIndex.monitor().subscribe(function(index) {
    plane.material.diffuse = configuration.items[index.newValue].image_texture;
})