Trick to hidden face removal - do as curves in geometry nodes, then extrude vertically.

The contour lines are rendered in neon, and the vertical extrusions in matt black.

This keeps face counts way down, compared to using a landscape mesh 2/2

@stevefaeembra This reminds me of a behind the scenes thing I saw about a movie whose name escapes me from that time period.

What appeared to be a computer wireframe was actually something like glow in the dark or fluorescent tape on the edges of a physical city model that had been painted black.