Paraview display error after remeshing by OptimizeMesh2d

General
1

Hello everyone,
I got a problem while using VTKOutput. When I remesh by mesh.ngmesh.OptimizeMesh2d, the mesh in netgen GUI is correct but incorrect in paraview as follows:

屏幕截图 2024-02-29 170328
屏幕截图 2024-02-29 170328791×620 102 KB

I think OptimizeMesh2d may rearrange the nodes number but don’t know how to get the correct image. Has anyone encountered a similar issue? Are there recommended solutions?

Thank you very much for your help!

2

can you provide a minimal example?
after optimizing, you might need to create a new ngsolve mesh wrapper around the netgen mesh:

mesh = Mesh(mesh.ngmesh)