Legacy Documentation: Version 4.3.0
MeshUtility.SetPerTriangleUV2
static function SetPerTriangleUV2(src: Mesh, triUV: Vector2[]): void;
static void SetPerTriangleUV2(Mesh src, Vector2[] triUV);
static def SetPerTriangleUV2(src as Mesh, triUV as Vector2[]) as void
Description

Will insert per-triangle uv2 in mesh and handle vertex splitting etc.