WxNviz

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Accepted Google Summer of Code 2008 project

• http://lists.osgeo.org/pipermail/grass-dev/2008-February/035792.html

Roadmap / Progress

Done

• Initial cleaning underlying GRASS OpenGL gsurf OGSF Library
  • Doxygenization, code documentation
  • Eliminate fprintf(), changed to G_*_message(), G_warning(), G_fatal_error(), and G_debug()

wxGUI Nviz extension

• Integration with Layer Manager, (un)loading data when map layer is (un)/checked
• Integration with Map Display, auto-rendering functional
• View settings (position, height, perspective, twist, z-exag), perspective can be changed by mouse wheel
• Surface settings (attributes, draw mode)
• Vector 2D/3D points and lines (including boundaries, areas, faces, volumes)
• Saving layer properties in workspace file

What should work:

• Start GRASS with NC dataset
• 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

• Update OGSF Library documentation
• Experimental prototype of CLI version of NVIZ (just very simple functionality)

http://trac.osgeo.org/grass/browser/grass/trunk/visualization/nviz2/cmd

• Design experimental nvizlib 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

• Support for volumes

Nviz CLI

• To be updated (based on wxGUI Nviz functionality)

Screenshots

Alpha prototype

2008-06-27: Display raster map from layer tree in 2.5D (surface)	2008-07-05: Support for vector data (2D lines) added
2008-07-26: Support for vector point data	2008-08-02: 3D vector data support
2008-08-09: Initial support for volumetric data

Ideas

• Fog support (see [1], [2], [3])

Google SoC Reports

1. 2008-06-06
2. 2008-06-13
3. 2008-06-20
4. 2008-06-27
5. 2008-07-04
6. 2008-07-11
7. 2008-07-18
8. 2008-07-25
9. 2008-08-01
10. 2008-08-08
11. 2008-08-15

Final reports

OGSF Library

Changes in OGSF library, diff before and after indentation relevant diffs:

• diff1
• diff2
• diff3
• diff4

Nviz command-line module

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)