[GRASSLIST:5001] road along with mountains in d.3d

[Dan Jacobson]

What would be a good way to view a road in d.3d, along with the hills?
First make the road from a vector into a raster, then 'burn' (add
etc., with r.mapcalc) it into the map=name (the layer used to generate
the color shown in the 3-d output)?  [d.3d is the most fancy item I
managed to compile.]
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