Attaching stickers to face regions (ARCore)
If your project is using ARCore XR Plugin and Android, you have access to ARCore-specific features, including transforms for three important face regions: the nose tip, left forehead, and right forehead. If you raise your left eyebrow, for example, that transform will move independently of the rest of the face, providing some more detail to the facial expressions in your app.
In addition to what we do here, you may also want to look at the ARCoreFaceRegions scene in the AR Foundation Samples project (see the ARF-samples/ folder in your project), and the ARCoreFaceRegionManager script it uses. The code we develop in this section is considerably simpler and easier to follow.
To demonstrate ARCore face regions, we'll implement several 2D stickers and attach them to the 3D face regions. We'll let you add eyebrows, a mustache, and licking lips using clipart that we identified at the top of this chapter (and I edited in Photoshop...
