idth = visibleWidthAtZDepth(0, webgl.camera)
      const height = visibleHeightAtZDepth(0, webgl.camera)

      // create a bunch of instanced elements
      const NUM_ELEMENTS = 100
      const dummy = new THREE.Object3D()

      // load the example texture
      const texture = new THREE.TextureLoader().load('./images/charles-unsplash.jpg')

      const geometry = new THREE.TetrahedronGeometry()
      const material = new ProjectedMaterial({
        camera: webgl.camera,
        texture,
        color: '#