Cellular Automata

Hi There,

I am trying to make a script with anemone where most of the time the points would be moved vertically (+y) and when they move on positive x I would then want them to move on negative y and then when they move positive x again this time back to positive y.

So y is multiplied with -1 whenever the point is moved on x.

The problem in my current script that it does that before the point is moved on x but not after so all points are stuck on the y axis.

Thank you!

Levent