[GRASS-user] r.los

[Richard Chirgwin]

Since r.los only works on rasters, I need to create the raster files. 
How do you create rasters starting with a set of vector contour maps?

I tried running v.extrude, using the "Elevation" column for the 
attribute. Grass processes this okay, reporting:

Number of nodes: 197049
Number of primitives: 197056
Number of points: 0
Number of lines: 0
Number of boundaries: 0
Number of faces: 197056
Number of areas: 0
Number of isles: 0

When I try to display the resulting map, however, I get a blank display. 
Have I failed to configure something for the display of the 3D output?

Richard Chirgwin