Smooth Shading reproduced in nodes

If you want to change the smooth shading (or just understand it), having it reproduced in nodes is a good start.

👉 There's also a "Triangle Area" node inside, you may find it useful elsewhere.

⚠I promise no support and give no guarantee the item actually works❗ However, I’d love to hear any kind of feedback: bug reports, suggestions, ‘backlinks’ to your work (if you decide to share, please provide info if I can use it in the description of the item). Based on that I may tinker with an idea some more, but no promises are made.