## DESCRIPTION

v.drape converts 2D/3D vector data into 3D vector format via sampling of an elevation surface. Three sampling algorithms adapted from v.sample were incorporated into this module: nearest neighbor, bilinear, and cubic convultion.

v.drape will skip vector features outside of current computational region or where raster map has NULL value. It's possible to include all vector features by specifying height value that will be assigned to verticles whose values can not be determined from raster map.

## NOTES

Additional vertices can be added to the input 2D vector map with v.split.

The module can be used in conjunction with v.out.pov and r.out.pov to export a complete set of vector and raster data for display in POVRAY.

## EXAMPLES

Spearfish example:

    v.drape in=roads elevation=elevation.10m method=bilinear out=roads3d
    v.info roads3d

Create 3D vector roads map containing only "unimproved" roads. Set road height to 1000 m for all parts without height information.

    v.drape input=roads type=line elevation=elevation.dem output=roads_3d \
            method=nearest scale=1.0 where='cat=5' layer=1 null_value=1000

### POVRAY example

    #export the vector data
    v.drape in=roads out=roads3d elevation=elevation.10m
    v.out.pov roads3d out=roads3d.pov
    #export the raster data
    r.out.pov elevation.10m tga=elevation.tga
    r.out.png landcover.30m out=landcover30m.png

    # now write a complete povray-script and launch povray

## SEE ALSO

v.extrude, v.to.3d, r.out.pov, v.in.region, v.out.pov, v.overlay, v.split, v.what.rast

## AUTHORS

Dylan Beaudette, University of California at Davis.
Updated for GRASS 7 by Martin Landa, Czech Technical University in Prague, Czech Republic