Abstract: One aspect of the present disclosure is directed to enabling a user to specify one or more forces to influence how a movable object carried by a 3D character may move during an animation sequence of the 3D character. In some embodiments, the user input can include an arrow. The user can be enabled manipulate the arrow to specify values for at least one parameter of the force to be applied to the movable object during the animation sequence. Another aspect of the disclosure is directed to enabling the user to draw a silhouette stroke to direct an animation of the movable object during the animation sequence. The silhouette stroke drawn by the user can be used as a “boundary” towards which the movable object may be “pulled” during the animation sequence. This may involve generating forces according to the position where the silhouette stroke is drawn.