Hello Carlos,
sorry for responding so late.
Due to popular demand (that's you and Markus Neteler) there's now a howto about NVIZ & anaglyphs in the Wiki:
http://grass.gdf-hannover.de/wiki/Stereo_anaglyphs#Step_by_step
If I understand correctly, Paraview is capable to render anaglyphs on the fly (use [v|r|r3].out.vtk to export GRASS data to use with Paraview).
Enjoy,
Peter
--
Dr. Peter Löwe
<peter.loewe@gmx.de>
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