This project aims to implement a small framework for rendering of dense line data, based on 2009 Everts et al. "Depth-Dependent Halos: Illustrative Rendering of Dense Line Data" [1].

Framework

The framework is based on a Qt 5 UI and uses OpenGL 3.3+ for drawing. The source code consists of C++ and GLSL 3.3 shader code.

Please note that for now CMake build files are provided for Linux only. Dependencies are Qt 5 and OpenGL 3.3.

Features:

draw entire dense line datasets (nerve fiber tractography, flow visualization, ...) without clutter
intuitively visualize depth (line width is depth dependent, halos occlude other lines)
emphasize colinear line bundles (lines at the same depth are not affected by halos)
filter data using clipping plane
concise user interface (it's great, promise!)

Supported Data File Formats

For now only TrackVis .trk tractography line data is supported. Support for .trk reading is enabled by an external library libtrkfileio by lheric. An example dataset of the human connectome is included. Moreover, the framework allows to generate random line data for testing.

Video

Uploaded on Youtube: SpaghettiVis: An implementation of Everts et al. dense line data visualization.

How to run

in directory containing CMakeLists.txt

mkdir build
cd build
cmake ..
make
./vis2

Thanks to

Everts et al. [1] for the great visualization algorithm
the organizers of the Visualization 2 course at TU Wien
the RealtimeVis lab course at TU Wien for the UI layout and the camera class

Screenshots

References

[1] Everts, Maarten H., et al. "Depth-dependent halos: Illustrative rendering of dense line data." IEEE Transactions on Visualization and Computer Graphics 15.6 (2009).