public override void Bind()
{
TubeVerts v = (TubeVerts)verts;
Hair s = (Hair)skeleton;
transfer.BindInt("_TubeLength", () => v.length);
transfer.BindInt("_TubeWidth", () => v.width);
transfer.BindInt("_NumVertsPerHair", () => s.numVertsPerHair);
}