Unity Game Optimization - Third Edition

Vertex attributes

A vertex attribute is simply a piece of information contained within a mesh file on a per-vertex basis, and each is normally represented as a group of multiple floating-point values. This includes, but is not limited to, a vertex's position (relative to the root of the mesh), a normal vector (a vector pointing away from the object's surface, most often used in lighting calculations), one or more sets of texture UV coordinates (used to define how one or more textures wrap around the mesh), and possibly even color information per vertex (normally used in custom lighting or for a flat shaded, low poly style object). Only meshes with fewer than 900 total vertex attributes used by the shader can be included in dynamic batching. ...