Adding a Rigid Body tag to an object will put its motion under the control of C4D’s physics engine. Once applied to our sphere object, it will fall due to gravity. Our sphere will keep falling to infinity unless there’s a surface for it to fall into. In order for our sphere object to react to and interact with floor object, we must apply a Collider Body tag to our floor. A Collider Body is an object that has a collider, but its position doesn’t change over time.
Make sure that Sphere object is selected. From the Tags menu, point to Simulation Tags | Rigid Body. This will assign a Rigid Body tag to our sphere object.