No matter what I try I can't make proper Round/Hexagonal shaped 3D unit portraits

[bender1453]

I take "Google is your friend" saying literally, that site saved me so much time and effort. However, in this case I always ended up with dead ends. No one knows the proper way to do it. The closest thing I came across was "attaching texture to the model in weak auras", which I have no idea of. Azerite UI and OWD UI somewhat accomplish this, so to have an understanding I tried having a look at lua files but I got nothing. Example:

https://i1382.photobucket.com/albums...pspryvjmmk.jpg

I do believe if I can find a way to clip textures in weak auras, like an invisible border, I'll finally succeed.

Thanks in advance, hope someone can help me

PS: I'm aware that I can hide edges with KG Panels, but I want something better because I want it to look perfect.