How to set different colors of the edges of surface mess?

[FantasyVR]

[nmwsharp]

Do you mean a different color for each edge? This isn't supported currently.

One thing you can do is create a Curve Network https://polyscope.run/structures/curve_network/basics/ where there is a node for each mesh vertex and an edge for each mesh edge. You can then set an edge color quantity for the curve network. This will render like a wireframe with a "tube" for each edge of the mesh.