I need an order value from mesh.vertices.i have tried sort node but It does not work

List.chop is your friend

list.chop is divided length.but i need negative value to positive value

i don’t understand what you are after, please give us a bit more information.

Sort by key node use the Z value of the points as the key?

how do get z value?

I’m not on my computer. But I think there is a Point.Z node. The trouble is you have vertices not points and I think you have convert the vertices to points somehow.

Edit: See node below for changing vertices into points. Then you just get the Point.Z node to get the z coordinate of the points.