With the free add-on utility "CADstudio DTMcol" you can automatically color your topographic digital terrain model (DTM) consisting of triangular 3DFACEs by its elevations.
Just download www.cadstudio.cz/download, load it with APPLOAD and start the DTMCOL command. Select your model (or All) and choose one of the predefined color palettes (16-color, 256-color, rainbow, big rainbow, green, land, hydro or pastel colors). The tool will analyze the extreme elevations (top, bottom), calculates the color ramps and then the toposurface 3D model will be recolored automatically.
See an example of the source model and some of the results (output) of DTMcol:
Video - using DTMcol:
You can get similar results from the surfaces functionality in AutoCAD Civil 3D
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