Hi,

I am now tearing my hairs out.

Surely a matter about Sioux' stratagems, and Sioux' trophies.

I am drawing on a 2D sketch.

I modify the plane containing the 2D sketch.

But, unfortunately, a basic math concept is seeming to be lost by SW during the travel : a plane has 2 faces, or to say things in other way, a 2D frame has 2 possible orientations.

Of course, when a plane is constructed, SW forgets this basic math concept (I learnt it one year before my high school d**i**ploma !!!!)

So, how can I flip a plane ?

Tx for your help, but it's really a pity that SW don't ask which orientation (among the 2 possible), has to be chosen for a construction.

If SW was written by Dassault enginers, it's not amazing that Dassault planes are falling from time to time.

Tx for your reply.

The 1st solution don't work, if I work with a 2D sketch

OK, R² is a sub manifold, when embedded in R³, but R² has a manifold structure too - ie an intrinsec structure.

So, I should have not to embed the 2D sketch into the whole space, to define some orientation.

Otherwise, I found a third solution on the forum

http://www.youtube.com/watch?v=tHEpn5vHSUw&feature=player_embedded

which works, but it's really funny to see that SW don't define any orientatiobn of a plane, when created, and force to such recipe.

Unfortunately, this is not the only really serious math mistake I found with this program.!!!

It's really serious that such mistakes are still living in a program, after n spread versions, n being greater than 20 or 30 !!!!