Animating the collision and interaction of objects in 3ds Max using keyframe methods can be a frustrating process, usually with poor results. Because of the randomness of objects as they interact with gravity and each other, many keys would need to be created and then adjusted many times to achieve convincing results.

Included in 3ds Max, MassFX is a simulation software used to automatically apply gravity to selected objects and then calculate their interactions as they collide with each other. The objects can be rigid body objects, hard surfaces that do not distort upon collision, or cloth surfaces that drape and fold as they interact with gravity, ...

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