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__TOC__
''(Back to [[WxPython-based GUI for GRASS|wxGUI]] page.)''


Back to [[WxPython-based GUI for GRASS|wxGUI]] page.
'''wxNviz''' is a [[wxGUI]] extension which allows users to realistically render multiple surfaces (raster data) in a 3D space, optionally using thematic coloring, draping 2D vector data over the surfaces, displaying 3D vector data in the space, and visualization of volume data (3D raster data).  


[http://trac.osgeo.org/grass/wiki/SoCProjects#a3.53DvisualizationtoolforwxPythonGRASSGUI Accepted Google Summer of Code 2008 project]
For usage instructions, see also the {{cmd|wxGUI.nviz|desc=manual page}}.


* http://lists.osgeo.org/pipermail/grass-dev/2008-February/035792.html
__TOC__
== Screenshots ==
<center>
<gallery perrow=3 widths=200>
Image:Wxnviz-alpha-0.png|2008-06-27: Display raster map from layer tree in 2.5D (surface)
Image:Wxnviz-alpha-1.png|2008-07-05: Support for vector data (2D lines) added
Image:Wxnviz-alpha-2.png|2008-07-26: Support for vector point data
Image:Wxnviz-alpha-3.png|2008-08-02: 3D vector data support
Image:Wxnviz-alpha-4.png|2008-08-09: Initial support for volumetric data
Image:Wxnviz-lmgr.png|2010-05-31: 3D view tools window integrated into Layer Manager
Image:Wxnviz-light.png|Lighting control panel in Layer Manager (2010-06-17)
Image:Wxnviz-fringe.png|Fringe control panel in Layer Manager (2010-06-23)
Image:Wxnviz-redirect.png|Redirect messages to wxGUI (2010-08-08)
Image:Wxnviz-volumes.png|Displaying raster (surface), 2D vector and 3D raster (volume) in the 3D space (2010-08-16)
Image:WxNviz surface page.png|Surface page of WxNviz modified (2011-06-02)
Image:WxNviz_constant_surface_page.png|Constant surface page added (2011-06-02)
Image:WxNviz_lighting.png|Lighting fixed (2011-05-02)
Image:WxNviz_cutting_planes_1.png|Cutting planes (shading blend) (2011-06-10)
Image:WxNviz_cutting_planes_2.png|Cutting planes (shading top color) (2011-06-10)
Image:WxNviz_view_page.png|View page modified (2011-06-10)
Image:Nviz_cmd_cutting_planes.png‎|Picture of surfaces cut by two planes (generated by nviz_cmd) (2011-06-30)
Image:WxNviz_generate_command.png‎|Command for nviz_cmd generated by wxNviz (2011-07-01)
Image:WxNviz_north_arrow.png‎|North Arrow implemented (2011-07-08)
Image:WxNviz_volumes.png‎|Colored isosurfaces with transparency (2011-07-08)
Image:WxNviz_volume_slices_1.png‎|Partially transparent slice (2011-07-14)
Image:WxNviz_volume_slices_2.png‎|Combination of slices and isosurface (2011-07-14)
Image:WxNviz_overlays.png‎|Raster legend, text label and north arrow (2011-07-22)
Image:WxNviz_thematic_points_colors‎.png|Thematic mapping (colors) for points (2011-08-05)
Image:WxNviz_colorrules_dialog.png|Dialog for {{cmd|v.colors}} opened from 3D view (2011-08-05)
</gallery>
</center>
== Animations ==
{{YouTube|AByFPKHvgu4|desc=Using fly-through mode for creating animation}}


wxNviz [http://grass.osgeo.org/grass64/manuals/html64_user/wxGUI.Nviz.html manual page].
== Video tutorials ==


== Roadmap / Progress ==
{{YouTube|ib1-mBbWkv4|desc=Loading data, settings layer properties}}
{{YouTube|ZLDstyumxv0|desc=Visualizing fringes and north arrow}}
{{YouTube|CmK-fEyf2SY|desc=3D raster maps (volumes) in the space (isosurface and slice mode)}}
{{YouTube|13wj5KWEweE|desc=Color thematic mapping}}


=== Done ===
=== Older tutorials (2010) ===


* Initial cleaning underlying [http://trac.osgeo.org/grass/browser/grass/trunk/lib/ogsf GRASS OpenGL gsurf OGSF Library]
{{YouTube|Ej_rBc9sgvE|desc=Loading data, settings layer properties}}
** Doxygenization, code documentation
{{YouTube|iWyaBL2Krto|desc=Visualizing fringes}}
** Eliminate <tt>fprintf()</tt>, changed to <tt>G_*_message()</tt>, <tt>G_warning()</tt>, <tt>G_fatal_error()</tt>, and <tt>G_debug()</tt>
{{YouTube|ioE_hHMHqKg|desc=3D raster maps (volumes) in the space}}


==== wxGUI Nviz extension ====
== Ideas ==


* Integration with Layer Manager, (un)loading data when map layer is (un)/checked
* Fog support (see [http://gpwiki.org/index.php/OpenGL:Tutorials:Tutorial_Framework:Light_and_Fog], [http://www.swiftless.com/tutorials/opengl/fog.html], [http://nehe.gamedev.net/data/lessons/lesson.asp?lesson=16])
* Integration with Map Display, auto-rendering functional
* Vertical labels (take from geonames.org point data): like in http://tev.fbk.eu/marmota/blog/?p=82
* View settings (position, height, perspective, twist, z-exag), perspective can be changed by mouse wheel
* Second interactive light source for isosurface visualization
* Surface settings (attributes, draw mode)
* Tick marks and coordinate values to x,y,z axis when drawing fringe
* Vector 2D/3D points and lines (including boundaries, areas, faces, volumes)
* Saving layer properties in workspace file


What should work:
<strike></strike>


* Start GRASS with NC dataset
== Troubleshooting  ==
* Add raster map "elevation" and vector map "roadsmajor"
* Start Nviz from Map display toolbar
* Change view, surface attributes, draw mode (try also auto-rendering)
* Enable/disable data layer from Layer Manager


=== In progress ===
* Nothing is rendered at all:
: Please note that with wxGTK port of wxPython (Linux systems), a problem might appear during wxNviz initialization (nothing is rendered at all) or when rendering vectors (bad order of rendering surfaces and vectors). If you encounter such problems, try to change a depth buffer number in wxGUI Menu > Settings > Preferences > Map Display > Advanced (possible numbers are 0, 16, 24, 32). It is currently not possible to automatically find out the right number which is working for your computer.


* Update OGSF Library documentation
== Known issues  ==
* Experimental prototype of CLI version of NVIZ (just very simple functionality)
::http://trac.osgeo.org/grass/browser/grass/trunk/visualization/nviz2/cmd
* Design experimental <tt>nvizlib</tt> used by CLI and wxPython NVIZ prototype
::http://trac.osgeo.org/grass/browser/grass/trunk/lib/nviz
* Experimental prototype of NVIZ toolbox for wxGUI (based on NVIZ CLI functionality)
::http://trac.osgeo.org/grass/browser/grass/trunk/gui/wxpython/nviz
::http://trac.osgeo.org/grass/browser/grass/trunk/gui/wxpython/gui_modules/nviz.py


==== wxGUI Nviz extension ====
#List of [http://trac.osgeo.org/grass/query?status=assigned&status=new&status=reopened&order=priority&col=id&col=summary&col=status&col=owner&col=type&col=priority&col=milestone&keywords=~wxNviz open] and [http://trac.osgeo.org/grass/query?status=assigned&status=closed&order=priority&col=id&col=summary&col=status&col=owner&col=type&col=priority&col=milestone&keywords=~wxNviz closed] tickets
#<strike>Adding vector data crashes wxGUI on Mac</strike>
#<strike>Viewing height sometimes sets to 1 after switching to 2D and back to 3D View (or with the simultaneous 2D view - very nice feature) and even after View is reset, it keeps getting back at 1 each time the slider is touched</strike>
#:Fixed in {{rev|46208}}
#Adding draw, draw current and clear button may be useful
#Thematic mapping is available in GRASS 7 only
#Display region in 3D does not change accordingly to display region in 2D in version &lt;= 6.5
#Appearance:
##&nbsp;I&nbsp;<strike>need to click View tab to get the arrow draw, same for the scale bar </strike>
##add legend &gt; OK: nothing gets drawn in 3D but the legend shows up when I switch to 2D but when I clicked delete scalebar (which was not drawn), my surface disapeared but the legend showed up along with white and black background (which I assume was supposed to be transparent, because when I moved the legend the surface was under it - we already discussed this, it may be my problem, because it works for Michael).
#General
##<strike>when I go from 3D view to 2D and then back to 3D I lose most of my settings&nbsp;</strike>
##<strike>similarly, when I add volume to Map layers I lose my view settings and the 3D view goes back to default </strike>
#Volumes:
##change of region by g.region seems to be ignored (or I missed something), I had to restart GRASS with the new region to get the 3D region for volumes right. Given that the default top, botom is 1,0, if GRASS starts with the default 3D region settings volumes do not work because there is just one level.
##<strike>isosurfaces work with my terrestrial lidar data but the slices don't, it seems that it is due my resolution being 0.3m, when I change it to 1m I get at least some limited slicing
###this may be in ogsf becuase slices in nviz do not work with this data either </strike>
#<strike>changing color to constant did not change the color of the isosurface</strike>


* Support for volumes
== Comparison of Tcl/Tk nviz and wxNviz functionality ==
What is missing in wxNviz:
* scaled difference
* lighting - follow surface viewpoint
* keyframe animation
* text rendering (in OpenGl)


==== Nviz CLI ====
What is working only partially:
* legend, labels
* thematic mapping - nviz allows to choose also icon and multiple classification
* basic support of animations


* To be updated (based on wxGUI Nviz functionality)
What is new in wxNviz:
* it is possible to change view more interactively using mouse


== Screenshots ==
Notes:
* Scripting functionality is replaced by m.nviz.image module
* wxNviz state is saved in workspace


=== Alpha prototype ===


<center>
== Google Summer of Code ==
{|
|-
| [[Image:Wxnviz-alpha-0.png|250px|thumb|2008-06-27: Display raster map from layer tree in 2.5D (surface)]] ||
[[Image:Wxnviz-alpha-1.png|250px|thumb|2008-07-05: Support for vector data (2D lines) added]]
|-
| [[Image:Wxnviz-alpha-2.png|250px|thumb|2008-07-26: Support for vector point data]] ||
[[Image:Wxnviz-alpha-3.png|250px|thumb|2008-08-02: 3D vector data support]]
|-
| [[Image:Wxnviz-alpha-4.png|250px|thumb|2008-08-09: Initial support for volumetric data]] ||
&nbsp;
|}
</center>


== Ideas ==
=== [[wxNviz GSoC 2008|2008]] ===


* Fog support (see [http://gpwiki.org/index.php/OpenGL:Tutorials:Tutorial_Framework:Light_and_Fog], [http://www.swiftless.com/tutorials/opengl/fog.html], [http://nehe.gamedev.net/data/lessons/lesson.asp?lesson=16])
* [http://trac.osgeo.org/grass/wiki/SoCProjects#wxNvizdevelopmentforenhanced34Dvisualizationandanalysis Accepted Google Summer of Code 2008 project]
* Vertical labels (take from geonames.org point data): like in http://tev.fbk.eu/marmota/blog/?p=82


== Google SoC Reports ==
=== [[wxNviz GSoC 2010|2010]] ===


# [http://lists.osgeo.org/pipermail/grass-dev/2008-June/038194.html 2008-06-06]
* [http://trac.osgeo.org/grass/wiki/SoCProjects#wxNvizdevelopmentforenhanced34Dvisualizationandanalysis Accepted Google Summer of Code 2010 project]
# [http://lists.osgeo.org/pipermail/grass-dev/2008-June/038266.html 2008-06-13]
# [http://lists.osgeo.org/pipermail/grass-dev/2008-June/038353.html 2008-06-20]
# [http://lists.osgeo.org/pipermail/grass-dev/2008-June/038472.html 2008-06-27]
# [http://lists.osgeo.org/pipermail/grass-dev/2008-July/038625.html 2008-07-04]
# [http://lists.osgeo.org/pipermail/grass-dev/2008-July/038753.html 2008-07-11]
# [http://lists.osgeo.org/pipermail/grass-dev/2008-July/038824.html 2008-07-18]
# [http://lists.osgeo.org/pipermail/grass-dev/2008-July/039007.html 2008-07-25]
# [http://lists.osgeo.org/pipermail/grass-dev/2008-August/039181.html 2008-08-01]
# [http://lists.osgeo.org/pipermail/grass-dev/2008-August/039305.html 2008-08-08]
# [http://lists.osgeo.org/pipermail/grass-dev/2008-August/039503.html 2008-08-15]


=== Final report ===
=== [[wxNviz GSoC 2011|2011]] ===


==== OGSF Library ====
* [http://trac.osgeo.org/grass/wiki/SoCProjects#CompletionofwxGUINvizextensionfor3DdatavisualizationinGRASSGIS Accepted Google Summer of Code 2011 project]


Changes in OGSF library, diff [http://trac.osgeo.org/grass/changeset?new=grass%2Ftrunk%2Flib%2Fogsf%4032321&old=grass%2Ftrunk%2Flib%2Fogsf%4031313 before] and [http://trac.osgeo.org/grass/changeset?new=grass%2Ftrunk%2Flib%2Fogsf%4032757&old=grass%2Ftrunk%2Flib%2Fogsf%4032585 after] indentation relevant diffs:
== See also ==
* [http://trac.osgeo.org/grass/changeset?new=grass%2Ftrunk%2Flib%2Fogsf%4032658&old=grass%2Ftrunk%2Flib%2Fogsf%4032652 diff1]
* [http://trac.osgeo.org/grass/changeset?new=grass%2Ftrunk%2Flib%2Fogsf%4032321&old=grass%2Ftrunk%2Flib%2Fogsf%4032034 diff2]
* [http://trac.osgeo.org/grass/changeset?new=grass%2Ftrunk%2Flib%2Fogsf%4031684&old=grass%2Ftrunk%2Flib%2Fogsf%4031335 diff3]
* [http://trac.osgeo.org/grass/changeset?new=grass%2Ftrunk%2Flib%2Fogsf%4031323&old=grass%2Ftrunk%2Flib%2Fogsf%4031313 diff4]


==== Nviz command-line module ====
* http://lists.osgeo.org/pipermail/grass-dev/2008-February/035792.html
 
The nviz_cmd module currently supports:
 
* '''Surfaces''', attributes:
** topography - raster map or constant values used as elevation (z values) for the current surface.
** color - raster map or constant color to drape over the current surface.  
** mask - raster map that controls the areas displayed from the current surface.
** transparency - raster map or constant value that controls the transparency of the current surface. The default is completely opaque.
** shininess - raster map or constant value that controls the shininess (reflectivity) of the current surface.
** emission - raster map or constant value that controls the light emitted from the current surface.
* For each loaded surface draw style:
** mode - coarse,fine,both
** style - wire,surface
** shading - flat,gouraud
** coarse and fine resolution
** wire color
* 2D/3D vector '''line''' features:
** line width, color
** mode - flat,surface (only for 2D)
** height (constant or above surface)
* 2D/3D vector '''point''' features:
** marker size, width, color
** marker - x,sphere,diamond,cube,box,gyro,aster,histogram
* '''Volume'''
** mode - isosurface,slice (currently only isosurface mode implemented)
** shading - flat,gouraud
** position, resolution
* Volume '''isosurface''' mode, attributes:
** level - reference isosurface level (height in map units).
** color - raster map or constant color to drape over the current volume.
** mask - raster map that controls the areas displayed from the current volume.
** transparency - raster map or constant value that controls the transparency of the current volume. The default is completely opaque.
** shininess - raster map or constant value that controls the shininess (reflectivity) of the current volume.
** emission - raster map or constant value that controls the light emitted from the current volume.
* '''Settings'''
** background color
* '''View''' parameters
** position, height, perspective, twist, zexag
* '''Output''' options
** filename, image size (width, height) and format (ppm, tif)


==== wxGUI Nviz extension ====
{{WxGUI}}


[[Category:Development]]
[[Category:NVIZ]]
[[Category:GUI]]
[[Category:Visualization]]
[[Category:Python]]
[[Category:WxGUI]]
[[Category: GSoC]]

Latest revision as of 10:56, 4 December 2018

(Back to wxGUI page.)

wxNviz is a wxGUI extension which allows users to realistically render multiple surfaces (raster data) in a 3D space, optionally using thematic coloring, draping 2D vector data over the surfaces, displaying 3D vector data in the space, and visualization of volume data (3D raster data).

For usage instructions, see also the manual page.

Screenshots

  • 2008-06-27: Display raster map from layer tree in 2.5D (surface)

    2008-06-27: Display raster map from layer tree in 2.5D (surface)

  • 2008-07-05: Support for vector data (2D lines) added

    2008-07-05: Support for vector data (2D lines) added

  • 2008-07-26: Support for vector point data

    2008-07-26: Support for vector point data

  • 2008-08-02: 3D vector data support

    2008-08-02: 3D vector data support

  • 2008-08-09: Initial support for volumetric data

    2008-08-09: Initial support for volumetric data

  • 2010-05-31: 3D view tools window integrated into Layer Manager

    2010-05-31: 3D view tools window integrated into Layer Manager

  • Lighting control panel in Layer Manager (2010-06-17)

    Lighting control panel in Layer Manager (2010-06-17)

  • Fringe control panel in Layer Manager (2010-06-23)

    Fringe control panel in Layer Manager (2010-06-23)

  • Redirect messages to wxGUI (2010-08-08)

    Redirect messages to wxGUI (2010-08-08)

  • Displaying raster (surface), 2D vector and 3D raster (volume) in the 3D space (2010-08-16)

    Displaying raster (surface), 2D vector and 3D raster (volume) in the 3D space (2010-08-16)

  • Surface page of WxNviz modified (2011-06-02)

    Surface page of WxNviz modified (2011-06-02)

  • Constant surface page added (2011-06-02)

    Constant surface page added (2011-06-02)

  • Lighting fixed (2011-05-02)

    Lighting fixed (2011-05-02)

  • Cutting planes (shading blend) (2011-06-10)

    Cutting planes (shading blend) (2011-06-10)

  • Cutting planes (shading top color) (2011-06-10)

    Cutting planes (shading top color) (2011-06-10)

  • View page modified (2011-06-10)

    View page modified (2011-06-10)

  • Picture of surfaces cut by two planes (generated by nviz_cmd) (2011-06-30)

    Picture of surfaces cut by two planes (generated by nviz_cmd) (2011-06-30)

  • Command for nviz_cmd generated by wxNviz (2011-07-01)

    Command for nviz_cmd generated by wxNviz (2011-07-01)

  • North Arrow implemented (2011-07-08)

    North Arrow implemented (2011-07-08)

  • Colored isosurfaces with transparency (2011-07-08)

    Colored isosurfaces with transparency (2011-07-08)

  • Partially transparent slice (2011-07-14)

    Partially transparent slice (2011-07-14)

  • Combination of slices and isosurface (2011-07-14)

    Combination of slices and isosurface (2011-07-14)

  • Raster legend, text label and north arrow (2011-07-22)

    Raster legend, text label and north arrow (2011-07-22)

  • Thematic mapping (colors) for points (2011-08-05)

    Thematic mapping (colors) for points (2011-08-05)

  • Dialog for v.colors opened from 3D view (2011-08-05)

    Dialog for v.colors opened from 3D view (2011-08-05)

Animations

Load video
YouTube
Using fly-through mode for creating animation

Video tutorials

Load video
YouTube
Loading data, settings layer properties
Load video
YouTube
Visualizing fringes and north arrow
Load video
YouTube
3D raster maps (volumes) in the space (isosurface and slice mode)
Load video
YouTube
Color thematic mapping

Older tutorials (2010)

Load video
YouTube
Loading data, settings layer properties
Load video
YouTube
Visualizing fringes
Load video
YouTube
3D raster maps (volumes) in the space

Ideas

  • Fog support (see [1], [2], [3])
  • Vertical labels (take from geonames.org point data): like in http://tev.fbk.eu/marmota/blog/?p=82
  • Second interactive light source for isosurface visualization
  • Tick marks and coordinate values to x,y,z axis when drawing fringe

Troubleshooting

  • Nothing is rendered at all:
Please note that with wxGTK port of wxPython (Linux systems), a problem might appear during wxNviz initialization (nothing is rendered at all) or when rendering vectors (bad order of rendering surfaces and vectors). If you encounter such problems, try to change a depth buffer number in wxGUI Menu > Settings > Preferences > Map Display > Advanced (possible numbers are 0, 16, 24, 32). It is currently not possible to automatically find out the right number which is working for your computer.

Known issues

  1. List of open and closed tickets
  2. Adding vector data crashes wxGUI on Mac
  3. Viewing height sometimes sets to 1 after switching to 2D and back to 3D View (or with the simultaneous 2D view - very nice feature) and even after View is reset, it keeps getting back at 1 each time the slider is touched
    Fixed in r46208
  4. Adding draw, draw current and clear button may be useful
  5. Thematic mapping is available in GRASS 7 only
  6. Display region in 3D does not change accordingly to display region in 2D in version <= 6.5
  7. Appearance:
    1.  I need to click View tab to get the arrow draw, same for the scale bar
    2. add legend > OK: nothing gets drawn in 3D but the legend shows up when I switch to 2D but when I clicked delete scalebar (which was not drawn), my surface disapeared but the legend showed up along with white and black background (which I assume was supposed to be transparent, because when I moved the legend the surface was under it - we already discussed this, it may be my problem, because it works for Michael).
  8. General
    1. when I go from 3D view to 2D and then back to 3D I lose most of my settings 
    2. similarly, when I add volume to Map layers I lose my view settings and the 3D view goes back to default
  9. Volumes:
    1. change of region by g.region seems to be ignored (or I missed something), I had to restart GRASS with the new region to get the 3D region for volumes right. Given that the default top, botom is 1,0, if GRASS starts with the default 3D region settings volumes do not work because there is just one level.
    2. isosurfaces work with my terrestrial lidar data but the slices don't, it seems that it is due my resolution being 0.3m, when I change it to 1m I get at least some limited slicing
      1. this may be in ogsf becuase slices in nviz do not work with this data either
  10. changing color to constant did not change the color of the isosurface

Comparison of Tcl/Tk nviz and wxNviz functionality

What is missing in wxNviz:

  • scaled difference
  • lighting - follow surface viewpoint
  • keyframe animation
  • text rendering (in OpenGl)

What is working only partially:

  • legend, labels
  • thematic mapping - nviz allows to choose also icon and multiple classification
  • basic support of animations

What is new in wxNviz:

  • it is possible to change view more interactively using mouse

Notes:

  • Scripting functionality is replaced by m.nviz.image module
  • wxNviz state is saved in workspace


Google Summer of Code

2008

2010

2011

See also

Retrieved from "https://grasswiki.osgeo.org/w/index.php?title=WxNviz&oldid=25411"