i wanted to test the math i found at internet and draw a

KLEIN BOTTLE

and i try to render it by

KleinS.beginShape(TRIANGLE_STRIP);

KleinS.vertex(xs, ys, zs);

KleinS.vertex(xs+1, ys+1, zs+1);

and i got something what looks like i am close,

but not know if my math, my loops or my shape vertex are wrong.

if someone has a idea ( and want to take a look ) pls find

klein test