Need help on how could this trick be done.

Hi guys.
I was wondering how to achieve this kind of mesh highlight for models, so basically when you hover over a part of a mesh it gets highlighted.
What i had in mind is to use double meshes one for the model and one for the highlight, and change the material of the highlighted area triangles to emissive shader and set the rest to transparent shader.
Or use multiple meshes for each part and highlight them but this is probably is not a good way to do it.
if you guys have any ideas to achieve this kind of effect it will be a great help thanks.