Mesh with SW-NE diagonals

 Hi，everyone！ I want to generate  a mesh with  SW-NE diagonals（below a code for mesh with WN-ES diagonals).
###############################from ngsolve import *
import ngsolve.meshes as ngm
import netgen.geom2d as geom2d
from netgen.geom2d import SplineGeometry


i = 2
mapping = lambda x,y : (x,y)
mesh = ngm.MakeStructured2DMesh(quads=False, nx = 2**i ,ny = 2**i, mapping=mapping)
Draw(mesh)

Best
Shasha Wang

    

Hi Shasha,

you can use the flip_triangles keyword argument for this, i.e, mesh = ngm.MakeStructured2DMesh(quads=False, nx = 2**i ,ny = 2**i, flip_triangles=True).

Best wishes,
Henry