Garry's Mod Wiki

mesh.UserData

  mesh.UserData( number tangentX, number tangentY, number tangentZ, number tangentHandedness )

Description

A set of four numbers that can be used for arbitrary purposes by Material shaders.
This is most commonly used to provide tangent information about each vertex to the Material's shader.

Arguments

1 number tangentX
2 number tangentY
3 number tangentZ
4 number tangentHandedness