Well I`m wrong its seem to work well,
@eric.b point that the order of the indices make the polygon facing innward.
the thing is - from user point of view its not possible at moment in TD to
know it without toggle on the normals in the display parameter.
Also then, in some case one can quick judge and think - the normals are fine…
( like my self ) .
Houdini viewport solve it by showing it in diffrent ( darkned) color than “deafult”, so the the user can immediately recognize flipped \ “bad” normals.
I guess can be moved to RFE.