GRASS-Wiki - User contributions [en]

GRASS and Paraview

2012-12-16T13:45:07Z

⚠️Matteopaolini: /* Visualization */

= 3D visualization of GRASS data with Paraview=

Download Paraview at http://www.paraview.org (available for Linux, MacOSX and MS-Windows) ([http://www.paraview.org/paraview/project/imagegallery.php 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). [[Voxel]]s are designed to support for example representations of trivariate continuous fields.

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

== 2D/3D Vector export ==

* 2D/3D vector maps: {{cmd|v.out.vtk}}

== Visualization ==

Start Paraview, load VTK data, and choose the correct readers : for example "Legacy VTK file"....it is fairly intuitive to use.
In the Properties section click the Apply button, next in the Display section set "Surface" in Representation menu, and set the name of the file that you had load on the Color menu. Then with Edit menu you can set the color scale.
In Paraview you have many filtes to process the data. A useful filter is "Cell data to point data". In the "Filters" drop-down menu you can find it in the "Alphabetical" list.
''(don't hesitate to expand this part)''

paraview --data=/tmp/threelayer.vtk

[[Image:LausanneDemoDataset3dParaview_4.png|thumb|center|400px|3D groundwater flow]]

[[Image:LausanneDemoDataset3dParaview_10.png|thumb|center|400px|3D groundwater flow]]

== RGB visualization ==

Data export with {{cmd|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

[[Image:Paraview fondazione mach 3D.png|thumb|center|400px|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

[[Image:Paraview fondazione mach ortho 3D.png|thumb|center|400px|Fondazione Mach - S. Michele (Italy) area shown in ParaView's stereo mode]]

== Creating Stereo anaglyphs ==

* see [[Stereo anaglyphs]]

= See also =

* GRASS 3D Workshop -- 3D data visualization with VTK: [http://www-pool.math.tu-berlin.de/~soeren/grass/files/3DWorkshop_soeren_handouts.pdf PDF handouts] (S. Gebbert)
* Video tutorials: [http://www-pool.math.tu-berlin.de/~soeren/grass/modules/ r3.out.vtk Tutorial] in four parts (S. Gebbert)
* GRASS and VTK related [http://www-pool.math.tu-berlin.de/~soeren/grass/modules/screenshots/ screenshots] (S. Gebbert)

[[Category: Visualization]]
[[Category: Documentation]]
[[Category: FAQ]]
[[Category: Linking to other languages]]
[[Category: Tutorial]]

GRASS and Paraview

2012-12-16T13:44:46Z

⚠️Matteopaolini: /* Visualization */

= 3D visualization of GRASS data with Paraview=

Download Paraview at http://www.paraview.org (available for Linux, MacOSX and MS-Windows) ([http://www.paraview.org/paraview/project/imagegallery.php 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). [[Voxel]]s are designed to support for example representations of trivariate continuous fields.

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

== 2D/3D Vector export ==

* 2D/3D vector maps: {{cmd|v.out.vtk}}

== Visualization ==

Start Paraview, load VTK data, and choose the correct readers : for example "Legacy VTK file"....it is fairly intuitive to use.
In the Properties section click the Apply button, next in the Display section set "Surface" in Representation menu, and set the name of the file that you had load on the Color menu. Then with Edit menu you can set the color scale.
In Paraview you have many filtes to process the data. A useful filter is "Cell data to point data". In the "Filters" drop-down menu you can findn it in the "Alphabetical" list.
''(don't hesitate to expand this part)''

paraview --data=/tmp/threelayer.vtk

[[Image:LausanneDemoDataset3dParaview_4.png|thumb|center|400px|3D groundwater flow]]

[[Image:LausanneDemoDataset3dParaview_10.png|thumb|center|400px|3D groundwater flow]]

== RGB visualization ==

Data export with {{cmd|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

[[Image:Paraview fondazione mach 3D.png|thumb|center|400px|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

[[Image:Paraview fondazione mach ortho 3D.png|thumb|center|400px|Fondazione Mach - S. Michele (Italy) area shown in ParaView's stereo mode]]

== Creating Stereo anaglyphs ==

* see [[Stereo anaglyphs]]

= See also =

* GRASS 3D Workshop -- 3D data visualization with VTK: [http://www-pool.math.tu-berlin.de/~soeren/grass/files/3DWorkshop_soeren_handouts.pdf PDF handouts] (S. Gebbert)
* Video tutorials: [http://www-pool.math.tu-berlin.de/~soeren/grass/modules/ r3.out.vtk Tutorial] in four parts (S. Gebbert)
* GRASS and VTK related [http://www-pool.math.tu-berlin.de/~soeren/grass/modules/screenshots/ screenshots] (S. Gebbert)

[[Category: Visualization]]
[[Category: Documentation]]
[[Category: FAQ]]
[[Category: Linking to other languages]]
[[Category: Tutorial]]

GRASS and Paraview

2012-12-15T15:04:58Z

⚠️Matteopaolini: /* Visualization */

= 3D visualization of GRASS data with Paraview=

Download Paraview at http://www.paraview.org (available for Linux, MacOSX and MS-Windows) ([http://www.paraview.org/paraview/project/imagegallery.php 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). [[Voxel]]s are designed to support for example representations of trivariate continuous fields.

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

== 2D/3D Vector export ==

* 2D/3D vector maps: {{cmd|v.out.vtk}}

== Visualization ==

Start Paraview, load VTK data, and choose the correct readers : for example "Legacy VTK file"....it is fairly intuitive to use.
In the Properties section click the Apply button, next in the Display section set "Surface" in Representation menu, and set the name of the file that you had load on the Color menu. Then with Edit menu you can set the color scale.
''(don't hesitate to expand this part)''

paraview --data=/tmp/threelayer.vtk

[[Image:LausanneDemoDataset3dParaview_4.png|thumb|center|400px|3D groundwater flow]]

[[Image:LausanneDemoDataset3dParaview_10.png|thumb|center|400px|3D groundwater flow]]

== RGB visualization ==

Data export with {{cmd|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

[[Image:Paraview fondazione mach 3D.png|thumb|center|400px|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

[[Image:Paraview fondazione mach ortho 3D.png|thumb|center|400px|Fondazione Mach - S. Michele (Italy) area shown in ParaView's stereo mode]]

== Creating Stereo anaglyphs ==

* see [[Stereo anaglyphs]]

= See also =

* GRASS 3D Workshop -- 3D data visualization with VTK: [http://www-pool.math.tu-berlin.de/~soeren/grass/files/3DWorkshop_soeren_handouts.pdf PDF handouts] (S. Gebbert)
* Video tutorials: [http://www-pool.math.tu-berlin.de/~soeren/grass/modules/ r3.out.vtk Tutorial] in four parts (S. Gebbert)
* GRASS and VTK related [http://www-pool.math.tu-berlin.de/~soeren/grass/modules/screenshots/ screenshots] (S. Gebbert)

[[Category: Visualization]]
[[Category: Documentation]]
[[Category: FAQ]]
[[Category: Linking to other languages]]
[[Category: Tutorial]]