NAME

r.out.vtk - Converts raster maps into the VTK-Ascii format

SYNOPSIS

r.out.vtk
r.out.vtk help
r.out.vtk [-stv] input=string[,string,...] [elevation=string] [rgbmaps=string[,string,...]] [output=string] [null=float] [elevscale=float]

Flags:

-s
Use structured grid for elevation (not recommended)
-t
Use polydata-trianglestrips for elevation grid creation
-v
Use polydata-vertices for elevation grid creation (to use with vtkDelauny2D)

Parameters:

input=string[,string,...]
Raster map(s) to be converted to VTK-ASCII data format
elevation=string
Raster map that represents the elevation, used for the 3D information
rgbmaps=string[,string,...]
3 raster maps (r,g,b) which are used to create rgb values [redmap,greenmap,bluemap]
output=string
Name for VTK-ASCII output file
null=float
Value to represent no data cell
Default: -10.0
elevscale=float
Scale factor for elevation
Default: 1.0

DESCRIPTION

Outputs Raster maps in VTK-ASCII format. Map's are valid Raster map's in the current mapset. output is the name of an VTK-ASCII file which will be written in the current working directory. If output is not specified then stdout is used. The module is sensitive to region settings (set with g.region). Special features are, that elevation and RGB Data are supported. The data and rgb values are mapped to the created 2.5D grid. The RGB input requires 3 raster maps: red, green, blue - in this order. The maps must! have values between 0 and 255, if not you will get lots of warnings! More than 1 RGB Dataset (3 maps) is not supported. For now, RGB is only supported if you choose an input map too, that may be changed in the future.

NOTES

This filter generates structured points with celldata if no elevationfile is given and a structured grid (not recommendet) or a polydataset (default) with pointdata if an elevationfile is given and put this in a simple VTK-ASCII file. Nor XML or binary output are supported. It is possible to choose more then one raster map to be written in the VTK-ASCII file. Each cell-/pointdata is named like the raster map it represents. You can visualize this file with the VTK Toolkit, Paraview and MayaVi which are based on VTK. If you have a raster map with partly no data, use the threshold filter in paraview to visualize the valid data. Just filter all data which is greater/lesser than the choosen null value in the VTK-ASCII file.

If elevation is choosen, a polygonal grid is created with quads, but the user can choose triangle strips and vertices. These dataformats a documented at VTK Toolkit.

SEE ALSO

r3.out.vtk
r.out.ascii
g.region

AUTHORS

Soeren Gebbert

Last changed: $Date: 2005/08/31 09:10:15 $


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