Is there any VertexSwap command under Gl which provides the possibility to make the strips turn at 90°?? I mean that any polygon strip will not be forced to use the last two points to create the next triangle!! )
Thus A,B,C sequence corresponding to the previous triangle, any new D point should add
a new triangle set as B,C,D so what? now with
vertexSwap it should become A,C,D…
Any reference? thanks!

nope, there isn’t. i’ve read a paper about mesh triangulation where they make a point of stating that opengl cannot do this (unlike iris gl that can). The simple soln (well, THE solution) is to dupe your vertices.