How mesh the merged 2D face image on a 3D model(how to create the map between 2D and 3D)?

### Checklist

- [X] I have searched for [similar issues](https://github.com/isl-org/Open3D/issues).
- [X] For Python issues, I have tested with the [latest development wheel](http://www.open3d.org/docs/latest/getting_started.html#development-version-pip).
- [X] I have checked the [release documentation](http://www.open3d.org/docs/release/) and the [latest documentation](http://www.open3d.org/docs/latest/) (for `master` branch).

### My Question

How to mesh a special texture on to a special 3D model (how to create the map between 2D and 3D)?
(1)speacial texture: 2D face images( merged from two images )
(2)special 3D model: 3D face model with points cloud
(3)3D model and 3D images got from the same face