Smoothing groups, Tangents and Binormals, Triangulate — polycount
Procedural Meshes in Unity: Normals and Tangents – code-spot
Matt Hoffman on Twitter: "The tangent space normal stuff comes from @PrismaticaDev 's video (https://t.co/6VRjoAh4iL), though the video was a bit hard to follow as some parts were outdated and I didn't
Unity3D Tangent Basis Calculator plugin for xNormal — polycount
Triangle mesh tangent space calculation
Messing with Tangent Space
Attaching new mesh tangent to an Edge? - Modeling - Blender Artists Community