GRASS logo

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

Table of contents

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 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

REFERENCES

AUTHOR

Martin Landa, Czech Technical University in Prague, Czech Republic

Last changed: $Date: 2013-06-02 15:41:45 +0200 (Sun, 02 Jun 2013) $

SOURCE CODE

Available at: v.delaunay3d source code (history)


Main index | Vector index | Topics index | Keywords index | Graphical index | Full index

© 2003-2017 GRASS Development Team, GRASS GIS 7.2.3svn Reference Manual