Leave grounded state (e.g. jump)

If the character is stable, any vertical velocity applied to it will be eventually ignored by the CharacterActor component. The only way to leave grounded state is by forcing this state via the CharacterActor API, this can be done thanks to the ForceNotGrounded method.

You can do the opposite, that is, go from "not grounded" to "grounded" by calling ForceGrounded.

Jump example

If you want your character to jump, first force the "not grounded" state, and then apply the vertical velocity required for the jump:

CharacterActor.ForceNotGrounded();
CharacterActor.VerticalVelocity = CharacterActor.Up * JumpSpeed;