Rockyfor3D (developed by Luuk Dorren, in collaboration with Frédéric Berger Cemagref 2003 - 2008; for a detailed and complete description see Dorren 2010 and other publications) is a model that simulates rockfall trajectories in 3D.

Rockyfor3D is one of the first models that explcitly and realistically integrates the barrier effect of trees on falling rocks. The model is a spatially distributed, probabilistic, process-based model and uses a Digital Elevation Model for the representation of the terrain and raster maps for the input parameters. Rockyfor3D is continuously developed further on the basis of new scientific findings and experiences from the practice. Currently, we are working on the rockfall rebound on soft soils as well as on the possibility to integrate rockfall nets and lying trees in the model.

The main calculations carried out by Rockyfor3D are:

- the 3D trajectory of each simulated rock
- the translational and rotational velocity along its trajectory
- the energy loss during a rebound on the slope or during a tree impact