I have this beautiful Lamborghini Urraco model but unfortunately I can't seem to fix this bad shading on this triangulated door mesh, it's very hard to see in Blender but it's quite eye-staggering when exported into a game:
I've been trying to reduce Auto Smooth but I can't go any lower before the mesh gets like it is without Auto Smooth. I also tried to apply sharp edges and replacing triangles but it still looks bad unfortunately.
P.S. I would like to keep it triangulated because the game automatically converts quads into triangles.
Thanks in advance for your help!