[GRASS-user] 3D interpolation

Dear GRASSusers,

Starting from 3D data points is there a module for 3D volume construction by
interpolation other than v.vol.rst?
In other words, is there some command to transform 3D raster points in a 3D
volume by a simple Inverse Distance Weighted Interpolation like r.surf.idw
or r.surf.idw2 in 2D?

Many thanks in advance
A.Clerici