Setting States Keys
Each physics rigid body has four states (please refer to The States of Rigid Body section for more details); you are able to switch states in various time frames so that the rigid body can be controlled, still, or free-falling in accordance with the state keys you have defined.
By using the state-switching method, you no longer need to use a hidden Kinematic rigid body to hit Frozen rigid bodies at certain times to have them fall down; Instead, by switching from a Static to Dynamic state at a desired time frame, the rigid body can drop at any time without contact with a external force.
Please refer to the sections below:
