How to smooth the shading on an object in Blender? - Artisticrender.com
Mark - hopsDocs
Line Set — Blender Manual
blender internal render engine - Mark sharp does nothing - Blender Stack Exchange
Blender/3d: Custom Normals – From Imagination To Creation
Exporting hard edges/Smoothing groups in Blender | Player Studio Forums
I'm making the backplate from Blender Guru's chair tutorial and after using mark sharp on edges to get rid of shading artifacts from the bevel modifier after increasing the segments, this happened
Blender 2.8 Auto Smooth and sharp edges - BlenderNation