Criss Cross triangulation

[cmd (Chris)]

Is this what you’re looking for:

Crossed mesh on a square

Hello. I would like to do some calculations on the unit square using crossed meshes. Is there a simple way to create a crossed mesh on a unit square? I would also like to globally refine a mesh such that the old mesh to be a subset of the new mesh. Is that possible to create a uniform crossed mesh by giving the maximum edge of a triangle? I would be grateful for any help!