Three dimensional / irregular tiling

I’m doing terrain models. One area (a county) goes from sea level to 14,410 feet. Building wood 3 to 4 inches high for the entire area is a waste of good wood, time, and bits to carve down the wood. Building up 1 to 4 layers of wood according to elevations, and running the router in open space, saves wood, but is a waste of time and wear on router.

Is there a way to define regular or irregular 3-dimensional tiles that show space to be carved and space that does not need to be carved? The router can then carve only space where wood exists. Minimum time, wear, and cost.

Defining and cutting multiple elevation layers, i.e. four layers, and gluing them together vertically creates a difficult alignment problem. The same is true for multiple horizontal 2-dimensional tiles.

Defining the 3-D tiles (cubes) would be relatively easy. I’ve done similar things in FORTRAN simulations.

I’ve searched 3-D Tiling and Irregular Tiling with no results.

Thanks for any insight you may have.

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