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GEM4D Version available for download

April 22, 2017

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Trajec3D Version available for download

March 11, 2017

Trajec3D seems to work flawlessly in all countries now. The previous version will expire on 1 April 2017, and the latest version on 1 July 2017.


As mentioned in the previous post, Trajec3D can now be downloaded in two different formats:

  1. Installation file that automatically installs all potential support files that could be required.

  2. ZIP-file of the folder containing all the require files (except the support files). Unzip the file and copy the directory to any location and manually create shortcuts. If the support files is required, download them by running:


Discussion: Spurious bounces
The "Time interval between physics calculations" encapsulates the parameters that impact on the physics engine accuracy. The sliding bar can be dragged to the right for quicker run-times at the cost of simulation accuracy, or to the left to increase the number of calculations per second for a more accurate result.


Lower accuracy could also result in 'spurious bounces', a common problem with rigid body dynamic physics engines. Apart from a low accuracy setting, this problem could also occur when using fall bodies with few vertices and sharp corners, or when the fall bodies are small in relation to the polygons of the stationary slope geometry.

In the screenshot above, 0.04s is the time between consecutive calculations, and 25/s thus the number of calculations per second. By checking "Real time", the calculation rate will automatically adjust to provide a simulation close to actual time, and useful to obtain an understanding of the time required for a particular rockfall event. This option is not recommended for accurate analysis, as the time between calculations could vary.


Checking "Stop time" will stop a simulation until the box is unticked. This is useful to set up a scene with multiple types of fall bodies, and then let them go simultaneously by unchecking the checkbox.



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