GRASS and VTK - Revision history

⚠️HamishBowman at 00:37, 19 June 2013

2013-06-19T00:37:02Z

← Older revision		Revision as of 00:37, 19 June 2013
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			* See also the [[GRASS and Paraview]] wiki page

	== Export for VTK ==		== Export for VTK ==

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	# Run {{Cmd\|r.colors}} with the '''-e''' equalize histogram flag to balance the colors nicely over the entire 3D dataset.		# Run {{Cmd\|r.colors}} with the '''-e''' equalize histogram flag to balance the colors nicely over the entire 3D dataset.
	# Export the new color rules with {{AddonCmd\|r.colors.out_vtk}}.		# Export the new color rules with {{AddonCmd\|r.colors.out_vtk}}.
	# Load in Paraview or similar, create a movie. ([http://stormy.msrc.sunysb.edu/diecast/DieCAST_GoM_yr43_July16-30.gif animated screenshot])		# Load in [[GRASS_and_Paraview\|Paraview]] or similar, create a movie. ([http://stormy.msrc.sunysb.edu/diecast/DieCAST_GoM_yr43_July16-30.gif animated screenshot])

⚠️HamishBowman: expand

2013-06-19T00:32:46Z

expand

← Older revision		Revision as of 00:32, 19 June 2013
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			== Export for VTK ==

			; Modules:

			* {{Cmd\|r.out.vtk}} - export raster data for VTK
			* {{Cmd\|r3.out.vtk}} - export 3D raster (voxel) data for VTK
			* {{Cmd\|v.out.vtk}} - export vector maps for VTK

			* {{AddonCmd\|r.colors.out_vtk}} addon script - export GRASS color rules for use with VTK


			== Workflows ==

			# Load 3D model data into GRASS with {{Cmd\|r3.in.ascii}}. (see [[Help with 3D]])
			# Split 3D raster map into individual layers, and stack them all into one map. (see the {{AddonCmd\|r.stack}} addon module)
			# Run {{Cmd\|r.colors}} with the '''-e''' equalize histogram flag to balance the colors nicely over the entire 3D dataset.
			# Export the new color rules with {{AddonCmd\|r.colors.out_vtk}}.
			# Load in Paraview or similar, create a movie. ([http://stormy.msrc.sunysb.edu/diecast/DieCAST_GoM_yr43_July16-30.gif animated screenshot])


			== vtkGRASSBridge ==

	vtkGRASSBrige provides a VTK/C++ interface to most of the GRASS GIS raster and vector C library functions. Its using an intuitive class structure to hide the complexity of the GRASS libraries.		vtkGRASSBrige provides a VTK/C++ interface to most of the GRASS GIS raster and vector C library functions. Its using an intuitive class structure to hide the complexity of the GRASS libraries.

⚠️Madi: /* Links */

2013-02-11T10:29:53Z

Links

← Older revision		Revision as of 10:29, 11 February 2013
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	[[Category:Development]]		[[Category:Development]]
	[[Category:Linking to other languages]]		[[Category:Linking to other languages]]
	~~[[Category:Python]]~~
	[[Category:VTK]]		[[Category:VTK]]
	[[Category:3D]]		[[Category:3D]]
			[[Category:Python]]

⚠️Madi: /* Links */

2013-02-11T10:29:24Z

Links

← Older revision		Revision as of 10:29, 11 February 2013
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	[[Category:Development]]		[[Category:Development]]
	[[Category:Linking to other languages]]		[[Category:Linking to other languages]]
			[[Category:Python]]
	[[Category:VTK]]		[[Category:VTK]]
	[[Category:3D]]		[[Category:3D]]

⚠️Madi at 09:39, 11 February 2013

2013-02-11T09:39:07Z

← Older revision		Revision as of 09:39, 11 February 2013
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	Reader to convert GRASS datasets (raster, vector) into VTK datasets are provided for raster and vector data. All vtkImage- and vtkPolyDataAlgorithms can be used to process GRASS raster and vector data. vtkImages can be directly written as GRASS raster maps into a GRASS location.		Reader to convert GRASS datasets (raster, vector) into VTK datasets are provided for raster and vector data. All vtkImage- and vtkPolyDataAlgorithms can be used to process GRASS raster and vector data. vtkImages can be directly written as GRASS raster maps into a GRASS location.

	This library can be used to build comprehensive 3d visualisation of GRASS GIS data with Java, Python and C++, as well as base for complex multithreaded image and vector filter to process GRASS GIS datasets i.e: as backend for WPS server.		This library can be used to build comprehensive 3D visualisation of GRASS GIS data with Java, Python and C++, as well as base for complex multithreaded image and vector filter to process GRASS GIS datasets i.e: as backend for WPS server.

	=== Using vtkGRASSBridge in Python ===		=== Using vtkGRASSBridge in Python ===

⚠️Madi: /* Links */

2013-02-11T09:10:25Z

Links

← Older revision		Revision as of 09:10, 11 February 2013
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	[[Category:Linking to other languages]]		[[Category:Linking to other languages]]
	[[Category:VTK]]		[[Category:VTK]]
			[[Category:3D]]

⚠️Wenzeslaus: /* Using vtkGRASSBridge in Python */

2012-07-26T09:40:22Z

Using vtkGRASSBridge in Python

← Older revision		Revision as of 09:40, 26 July 2012
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	# Now build the pipeline		# Now build the pipeline
	# read the vector map without creating topology		# read the vector map without creating topology
	reader = vtkGRASSVectorPolyDataReader() # The reader does not need		reader = vtkGRASSVectorPolyDataReader() # The reader does not need topology information
	topology information
	reader.SetVectorName("elev_lid792_randpts")		reader.SetVectorName("elev_lid792_randpts")

Neteler: +Import of VTK into GRASS

2012-01-18T18:34:11Z

+Import of VTK into GRASS

← Older revision		Revision as of 18:34, 18 January 2012
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	writer.Write()		writer.Write()
	</source>		</source>

			=== Import of VTK data into GRASS ===

			Implemented in the VTK-GRASS-Bridge:

			* http://code.google.com/p/vtk-grass-bridge/source/browse/trunk/IO/vtkGRASSRasterImageWriter.h
			* http://code.google.com/p/vtk-grass-bridge/source/browse/trunk/IO/vtkGRASSVectorPolyDataWriter.h
			* http://code.google.com/p/vtk-grass-bridge/source/browse/trunk/IO/vtkGRASSRaster3dImageWriter.h

	== Links ==		== Links ==

Neteler: New bridge from Soeren Gebbert, http://lists.osgeo.org/pipermail/grass-dev/2009-September/046368.html

2009-09-26T15:23:40Z

New bridge from Soeren Gebbert, http://lists.osgeo.org/pipermail/grass-dev/2009-September/046368.html

New page

vtkGRASSBrige provides a VTK/C++ interface to most of the GRASS GIS raster and vector C library functions. Its using an intuitive class structure to hide the complexity of the GRASS libraries.

Additionally, the vtkGRASSBridge provides access to GRASS C library functions for Python and Java, using the VTK wrapper.

Reader to convert GRASS datasets (raster, vector) into VTK datasets are provided for raster and vector data. All vtkImage- and vtkPolyDataAlgorithms can be used to process GRASS raster and vector data. vtkImages can be directly written as GRASS raster maps into a GRASS location.

This library can be used to build comprehensive 3d visualisation of GRASS GIS data with Java, Python and C++, as well as base for complex multithreaded image and vector filter to process GRASS GIS datasets i.e: as backend for WPS server.

=== Using vtkGRASSBridge in Python ===

Here a small Python example to triangulate vector points from the North Carolina demo data set with the VTK delaunay filter class:

<source lang="python">
# The purpose of this example is
# to read a grass vector map without topology information
# into the VTK poly data format and processing that map with vtkDelaunay2D.
# The processed data is written as VTK XML file to the file system

# Init grass variables
init = vtkGRASSInit()

# Now build the pipeline
# read the vector map without creating topology
reader = vtkGRASSVectorPolyDataReader() # The reader does not need
topology information
reader.SetVectorName("elev_lid792_randpts")

# Setup the delaunay triangulation
delaunay = vtkDelaunay2D()
delaunay.SetInputConnection(reader.GetOutputPort())

# write the data as XML with base64 encoding
writer = vtkXMLPolyDataWriter()
writer.SetFileName("/tmp/test.vtk")
writer.SetInputConnection(delaunay.GetOutputPort())
writer.Write()
</source>

== Links ==

* http://code.google.com/p/vtk-grass-bridge/

[[Category:Development]]
[[Category:Linking to other languages]]
[[Category:VTK]]