Complex shape character outline

Question

Say I have this character and I want allow user to select it, so when it s selected I want to show an outline around it.

Answer 1

I found something on gamedev.stackexchange.com/ that could be useful. They talk of a stencil buffer. I have no idea on how to apply this to THREE.js though..

https://gamedev.stackexchange.com/questions/59361/opengl-get-the-outline-of-multiple-overlapping-objects