using System;
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using UnityEngine;
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#if UNITY_EDITOR
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#endif
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namespace UnityStandardAssets.Cameras
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{
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[ExecuteInEditMode]
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public class AutoCam : PivotBasedCameraRig
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{
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[SerializeField] private float m_MoveSpeed = 3; // How fast the rig will move to keep up with target's position
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[SerializeField] private float m_TurnSpeed = 1; // How fast the rig will turn to keep up with target's rotation
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[SerializeField] private float m_RollSpeed = 0.2f;// How fast the rig will roll (around Z axis) to match target's roll.
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[SerializeField] private bool m_FollowVelocity = false;// Whether the rig will rotate in the direction of the target's velocity.
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[SerializeField] private bool m_FollowTilt = true; // Whether the rig will tilt (around X axis) with the target.
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[SerializeField] private float m_SpinTurnLimit = 90;// The threshold beyond which the camera stops following the target's rotation. (used in situations where a car spins out, for example)
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[SerializeField] private float m_TargetVelocityLowerLimit = 4f;// the minimum velocity above which the camera turns towards the object's velocity. Below this we use the object's forward direction.
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[SerializeField] private float m_SmoothTurnTime = 0.2f; // the smoothing for the camera's rotation
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private float m_LastFlatAngle; // The relative angle of the target and the rig from the previous frame.
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private float m_CurrentTurnAmount; // How much to turn the camera
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private float m_TurnSpeedVelocityChange; // The change in the turn speed velocity
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private Vector3 m_RollUp = Vector3.up;// The roll of the camera around the z axis ( generally this will always just be up )
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protected override void FollowTarget(float deltaTime)
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{
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// if no target, or no time passed then we quit early, as there is nothing to do
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if (!(deltaTime > 0) || m_Target == null)
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{
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return;
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}
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// initialise some vars, we'll be modifying these in a moment
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var targetForward = m_Target.forward;
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var targetUp = m_Target.up;
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if (m_FollowVelocity && Application.isPlaying)
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{
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// in follow velocity mode, the camera's rotation is aligned towards the object's velocity direction
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// but only if the object is traveling faster than a given threshold.
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if (targetRigidbody.velocity.magnitude > m_TargetVelocityLowerLimit)
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{
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// velocity is high enough, so we'll use the target's velocty
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targetForward = targetRigidbody.velocity.normalized;
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targetUp = Vector3.up;
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}
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else
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{
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targetUp = Vector3.up;
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}
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m_CurrentTurnAmount = Mathf.SmoothDamp(m_CurrentTurnAmount, 1, ref m_TurnSpeedVelocityChange, m_SmoothTurnTime);
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}
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else
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{
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// we're in 'follow rotation' mode, where the camera rig's rotation follows the object's rotation.
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// This section allows the camera to stop following the target's rotation when the target is spinning too fast.
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// eg when a car has been knocked into a spin. The camera will resume following the rotation
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// of the target when the target's angular velocity slows below the threshold.
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var currentFlatAngle = Mathf.Atan2(targetForward.x, targetForward.z)*Mathf.Rad2Deg;
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if (m_SpinTurnLimit > 0)
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{
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var targetSpinSpeed = Mathf.Abs(Mathf.DeltaAngle(m_LastFlatAngle, currentFlatAngle))/deltaTime;
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var desiredTurnAmount = Mathf.InverseLerp(m_SpinTurnLimit, m_SpinTurnLimit*0.75f, targetSpinSpeed);
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var turnReactSpeed = (m_CurrentTurnAmount > desiredTurnAmount ? .1f : 1f);
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if (Application.isPlaying)
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{
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m_CurrentTurnAmount = Mathf.SmoothDamp(m_CurrentTurnAmount, desiredTurnAmount,
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ref m_TurnSpeedVelocityChange, turnReactSpeed);
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}
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else
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{
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// for editor mode, smoothdamp won't work because it uses deltaTime internally
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m_CurrentTurnAmount = desiredTurnAmount;
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}
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}
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else
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{
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m_CurrentTurnAmount = 1;
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}
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m_LastFlatAngle = currentFlatAngle;
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}
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// camera position moves towards target position:
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transform.position = Vector3.Lerp(transform.position, m_Target.position, deltaTime*m_MoveSpeed);
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// camera's rotation is split into two parts, which can have independend speed settings:
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// rotating towards the target's forward direction (which encompasses its 'yaw' and 'pitch')
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if (!m_FollowTilt)
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{
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targetForward.y = 0;
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if (targetForward.sqrMagnitude < float.Epsilon)
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{
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targetForward = transform.forward;
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}
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}
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var rollRotation = Quaternion.LookRotation(targetForward, m_RollUp);
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// and aligning with the target object's up direction (i.e. its 'roll')
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m_RollUp = m_RollSpeed > 0 ? Vector3.Slerp(m_RollUp, targetUp, m_RollSpeed*deltaTime) : Vector3.up;
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transform.rotation = Quaternion.Lerp(transform.rotation, rollRotation, m_TurnSpeed*m_CurrentTurnAmount*deltaTime);
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}
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}
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}
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