Here is a simulated physical world — a very simple world consisting of a room with walls and a floor. A spherical obstacle rests in the middle of the floor. You’re seeing the collision of an elastically deformable solid with the sphere. Of course, we’re also simulating gravity.

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Quote text and notes from Wikiquote: Demetri Terzopoulos (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.