NVIZ 3-D GRASS Interface
NVIZ is a GRASS module which allows users to realistically render multiple
surfaces in a 3D space, optionally using thematic coloring, draping GRASS
vector files over the surfaces, and displaying GRASS site files either
draped on the surfaces or as 3D point locations.
The NVIZ code is part of the standard GRASS source code
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You can generate MPEG animations
with NVIZ (needs GRASS compiled with ffmpeg support).
Examples done with NVIZ 3D tool