A while ago, now, someone ( oops, cant rememebr who now )
That'd be me!
For both MESHflat and MESHtube, using the additional params for addvertex ...
Set the vertexu on V0 and V3 to be l / Segs and (l+1)/Segs on V1 and V2.
Set the vertexv on V0 and V1 to be 0 and for V2 and V3 to be 1.0
That should work.
Stevie