using UnityEngine; using UnityEngine.Serialization; namespace Cinemachine { /// /// This is a very simple behaviour that constrains its transform to a CinemachinePath. /// It can be used to animate any objects along a path, or as a Follow target for /// Cinemachine Virtual Cameras. /// [DocumentationSorting(21f, DocumentationSortingAttribute.Level.UserRef)] [ExecuteInEditMode] public class CinemachineDollyCart : MonoBehaviour { /// The path to follow [Tooltip("The path to follow")] public CinemachinePathBase m_Path; /// This enum defines the options available for the update method. public enum UpdateMethod { /// Updated in normal MonoBehaviour Update. Update, /// Updated in sync with the Physics module, in FixedUpdate FixedUpdate }; /// When to move the cart, if Velocity is non-zero [Tooltip("When to move the cart, if Velocity is non-zero")] public UpdateMethod m_UpdateMethod = UpdateMethod.Update; /// How to interpret the Path Position [Tooltip("How to interpret the Path Position. If set to Path Units, values are as follows: 0 represents the first waypoint on the path, 1 is the second, and so on. Values in-between are points on the path in between the waypoints. If set to Distance, then Path Position represents distance along the path.")] public CinemachinePathBase.PositionUnits m_PositionUnits = CinemachinePathBase.PositionUnits.Distance; /// Move the cart with this speed [Tooltip("Move the cart with this speed along the path. The value is interpreted according to the Position Units setting.")] [FormerlySerializedAs("m_Velocity")] public float m_Speed; /// The cart's current position on the path, in distance units [Tooltip("The position along the path at which the cart will be placed. This can be animated directly or, if the velocity is non-zero, will be updated automatically. The value is interpreted according to the Position Units setting.")] [FormerlySerializedAs("m_CurrentDistance")] public float m_Position; void FixedUpdate() { if (m_UpdateMethod == UpdateMethod.FixedUpdate) SetCartPosition(m_Position += m_Speed * Time.deltaTime); } void Update() { if (!Application.isPlaying) SetCartPosition(m_Position); else if (m_UpdateMethod == UpdateMethod.Update) SetCartPosition(m_Position += m_Speed * Time.deltaTime); } void SetCartPosition(float distanceAlongPath) { if (m_Path != null) { m_Position = m_Path.NormalizeUnit(distanceAlongPath, m_PositionUnits); transform.position = m_Path.EvaluatePositionAtUnit(m_Position, m_PositionUnits); transform.rotation = m_Path.EvaluateOrientationAtUnit(m_Position, m_PositionUnits); } } } }