GRASS and Paraview: Difference between revisions

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== 2D/3D Raster/voxel export ==
== 2D/3D Raster/voxel export ==
GRASS GIS is one of the few GIS with volume data support. Here data are stored as a 3D raster with a unit volume called a voxel (volume pixel). [[Voxel]]s are designed to support for example representations of trivariate continuous fields.


* 2D raster maps: {{cmd|r.out.vtk}}
* 2D raster maps: {{cmd|r.out.vtk}}
* 3D raster maps: {{cmd|r3.out.vtk}}
* 3D raster (voxel) maps: {{cmd|r3.out.vtk}}


== 2D/3D Vector export ==
== 2D/3D Vector export ==

Revision as of 14:40, 3 December 2012

3D visualization of GRASS data with Paraview

Download Paraview at http://www.paraview.org (available for Linux, MacOSX and MS-Windows) (screenshot gallery)

2D/3D Raster/voxel export

GRASS GIS is one of the few GIS with volume data support. Here data are stored as a 3D raster with a unit volume called a voxel (volume pixel). Voxels are designed to support for example representations of trivariate continuous fields.

2D/3D Vector export

Visualization

Start Paraview, load the VTK data,... it is fairly intuitive to use. (don't hesitate to expand this part)

paraview --data=/tmp/threelayer.vtk
3D groundwater flow
3D groundwater flow

RGB visualization

Data export with r.out.vtk:

r.out.vtk input=dsm_s_michele elevation=dsm_s_michele \
          rgbmaps=ofd_s_michele.red,ofd_s_michele.green,ofd_s_michele.blue \
          out=s_michele_color.vtk

Load into Paraview:

paraview --data=s_michele_color.vtk
  • In Paraview, click "Apply"
  • Select the "Display" tab and choose "Color by" to switch from input scalars to rgb scalars
  • Disable the "Map Scalars" check button in the display tab to avoid the use of a lookup table
Fondazione Mach - S. Michele (Italy) area shown in ParaView

Shown as stereo anaglyphs

paraview --stereo --data=s_michele_color.vtk
  • In Paraview, click "Apply"
  • Select the "Display" tab and choose "Color by" to switch from input scalars to rgb scalars
  • Disable the "Map Scalars" check button in the display tab to avoid the use of a lookup table
Fondazione Mach - S. Michele (Italy) area shown in ParaView's stereo mode

Creating Stereo anaglyphs

See also