How to get the face of a part on touch?

I want to get the specific face of the part that was touched, if any, such as the front, back, left, right, top.

Is there an API or some method I can do this easily?

Thanks in advance :)

A similar question has already been answered here: How can I detect a surface a part hit?. You could use the HumanoidRootPart instead of a bullet.