Trajec3D is a three-dimensional rigid body rock fall analysis program that can simulate the trajectory of volumetric bodies during free fall, bouncing, sliding and rolling. The body shape is selected from a toolbar and the size is a function of the selected geometry, mass and rock density. The physics interaction between materials is a function of the combined properties of the fall body and the impact surface, and three parameters are required: coefficient of restitution, static friction angle, dynamic friction angle.
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