v.delaunay3d - GRASS GIS manual

Note: This document is for an older version of GRASS GIS that has been discontinued. You should upgrade, and read the current manual page.

NAME

v.delaunay3d - Creates a 3D triangulation from an input vector map containing points or centroids.

KEYWORDS

vector, geometry, 3D triangulation

SYNOPSIS

v.delaunay3d

v.delaunay3d --help

v.delaunay3d [-pl] input=name [layer=string] output=name [--overwrite] [--help] [--verbose] [--quiet] [--ui]

Flags:

-p: Perform plain triangulation
-l: Output triangulation as a graph (lines), not faces
--overwrite: Allow output files to overwrite existing files
--help: Print usage summary
--verbose: Verbose module output
--quiet: Quiet module output
--ui: Force launching GUI dialog

Parameters:

input=name [required]: Name of input vector map; Or data source for direct OGR access
layer=string: Layer number or name ('-1' for all layers); A single vector map can be connected to multiple database tables. This number determines which table to use. When used with direct OGR access this is the layer name.; Default: -1
output=name [required]: Name for output vector map

DESCRIPTION
NOTES
EXAMPLE
REFERENCES
SEE ALSO
AUTHOR

DESCRIPTION

v.delaunay3d performs 3D Delaunay triangulation on input 3D vector point map. Resultant facets (ie. triangles) of tetrahedral network (TEN) are written as faces to the output vector map. If -l flag is given, the module writes edges of the network as lines instead of faces. By -p flag the user can perform plain 3D triangulation instead of Delaunay triangulation. In the plain triangulation the facets depends on the insertion order of the vertices.

NOTES

3D triangulation is performed by the CGAL library.

Centroids are treated as points when reading data from the input vector map. Note that input vector map must be 3D, the output is always 3D.

EXAMPLE

# generate random 3D points
v.random out=rp n=100 zmax=100 -z
# perform 3D triangulation
v.delaunay3d input=rp output=rp_ten
...
Number of vertices: 100
Number of edges: 626
Number of triangles: 1019
Number of tetrahedrons: 492