ThreeDimSim:3D Mechanics simulator descriptions ThreeDimSim is a powerful 3D mechanics simulation & rendering application. 3D scene is defined by script using simple shapes & imported meshes from 3ds dxf & stl files. Mechanics of solid objects are simulated together with dynamic objects like springs & joints. Simulation includes an automatic exact collision detection & collision simulation. Simulation is rendered using an extensive color model using texturing shadow rendering & can be reviewed using different viewpoints. The simulated scene can be exported to a VRML file including the animation. The scene can be exported as a video clip as well.