Intergalactic Gravitational Motion Simulator v3.2

A spiral galaxy is distorted into a peculiar galaxy by the tidal
forces of an interacting companion. The Intergalactic Gravitational Motion Simulator version 3.2 combines an n-body gravitational simulator with simple galaxy modeling and 3-D visualization software in a single executable program, IGMS.exe. It is based in MS-DOS and will work best if run in full-screen mode. Use of the program is relatively simple but not intuitive and there are a large number of variables that must be entered for the simulation to function properly.

Clicking on 'Download IGMS package' below will download a ZIP file containing all of the below files. This can be downloaded to a temporary directory and the various component files can be unzipped to an appropriate location afterward. If you don't have an unzip utility or want only certain files, the files are also available for individual download, but keep in mind that the graphics support file EGAVGA.BGI must be placed in the same directory as the executable or else the program will not function properly. Also, if you download files individually, your browser may try to open them rather than save them to disk. To avoid this, right click on the download link and select "Save Link As..." to download the file.

Once you have downloaded and unzipped the files, IGMSv3.2 can be run simply by double-clicking on the IGMS.EXE icon in the appropriate directory. See the manual (below) for further information.


Max Galaxies: 2
Max Particles: 502
Max Recordings: 65
Video Resolution: 640x480
Max. Colors: 16
Galaxy Mass Model: Spherical Variable-Density Central Mass
Galaxy Disk Model: Disk of Concentric Massless-Particle Rings
Interaction Processing Time: 0.02 MHz s
Simulation Speed (800 MHz): 40000 interactions/second
Program size: 80 KB (code), 138 KB (executable)
Minimum System Requirements: 80486 Processer, 1MB RAM, 16-color EVGA video card.

Terms of agreement (read before downloading) This software may be used, modified and redistributed in any way you please provided you credit me as the original program designer where appropriate.
Intergalactic Gravitational Motion Simulator v3.2
  • Download IGMS package (.ZIP)
  • Download Executable
  • Download Source Code*
  • Download Graphics Support File**
  • Simulator Manual
  • *The IGMS v3.2 was designed in Borland C/C++ 3.1 and due to graphics features probably cannot be recompiled without the software included in that package. It was also designed by a 17-year-old who had never written a C program before, so if you're an experienced programmer, brace yourself before actually viewing the source...
    **This must be placed in the same directory as the executable for it to function properly.

    Related links:
    Hibbard's Interacting Galaxies Page