Glnemo2, an interactive 3D visualization program used to display in 3D the particles positions of the different components of an nbody snapshot (Nemo, Gadget1/2/3, phiGrape, Ramses, gyrfalcON live)

Jean-Charles Lambert (Laboratoire Atrsophysique de Marseille)


I propose to give a live demonstration of glnemo2.
Glnemo2 is an interactive 3D visualization program , developped in C++, using the OpenGL library and Nokia QT 4.X API. It displays in 3D the particles positions of the different components of an nbody snapshot.
Glnemo2 is a very usefull tool for everybody running nbody simulations. It gives very quickly a lot of information about the data (shape, density area, formation of structures such as spirals, bars, or peanuts)
It allows for in/out zooms, rotations, changes of scale, translations, selection of different groups of particles and plots in different blending colors. It can color particles according to their density or temperature, play with the density threshold, trace orbits, display different time steps, take automatic screenshots to make movies, select particles using the mouse, fly over a simulation using a given camera path, etc. All these features are accessible from a very intuitive graphic user interface.
Glnemo2 supports a wide range of input file formats (Nemo, Gadget 1 and 2, phiGrape, Ramses, list of files, realtime gyrfalcON simulation) which are automatically detected at loading time without user intervention.
Glnemo2 uses a plugin mechanism to load the data, so that it is easy to add a new file reader. It's powered by a 3D engine which uses the latest OpenGL technology, such as shaders (glsl), vertex buffer object, frame buffer object, and takes in account the power of the graphic card used in order to accelerate the rendering. With a fast GPU, millions of particles can be rendered in real time.
Glnemo2 runs on Linux, Windows (using minGW compiler), and MaxOSX, thanks to the QT4API.
Glnemo2 project is here:
Some movies:

Paper ID: F5

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