Code Review

1 using System;
2 using
UnityEngine;
3 #
if UNITY_EDITOR
4
5 #endif

6
7 namespace
UnityStandardAssets.Cameras
8 {
9     
[ExecuteInEditMode]
10     
public class AutoCam : PivotBasedCameraRig
11     {
12         [SerializeField]
private float m_MoveSpeed = 3; // How fast the rig will move to keep up with target's position
13         [SerializeField]
private float m_TurnSpeed = 1; // How fast the rig will turn to keep up with target's rotation
14         [SerializeField]
private float m_RollSpeed = 0.2f;// How fast the rig will roll (around Z axis) to match target's roll.
15         [SerializeField]
private bool m_FollowVelocity = false;// Whether the rig will rotate in the direction of the target's velocity.
16         [SerializeField]
private bool m_FollowTilt = true; // Whether the rig will tilt (around X axis) with the target.
17         [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)
18         [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.
19         [SerializeField]
private float m_SmoothTurnTime = 0.2f; // the smoothing for the camera's rotation
20
21         
private float m_LastFlatAngle; // The relative angle of the target and the rig from the previous frame.
22         
private float m_CurrentTurnAmount; // How much to turn the camera
23         
private float m_TurnSpeedVelocityChange; // The change in the turn speed velocity
24         
private Vector3 m_RollUp = Vector3.up;// The roll of the camera around the z axis ( generally this will always just be up )
25
26
27         
protected override void FollowTarget(float deltaTime)
28         {
29             
// if no target, or no time passed then we quit early, as there is nothing to do
30             
if (!(deltaTime > 0) || m_Target == null)
31             {
32                 
return;
33             }
34
35             
// initialise some vars, we'll be modifying these in a moment
36             
var targetForward = m_Target.forward;
37             
var targetUp = m_Target.up;
38
39             
if (m_FollowVelocity && Application.isPlaying)
40             {
41                 
// in follow velocity mode, the camera's rotation is aligned towards the object's velocity direction
42                 
// but only if the object is traveling faster than a given threshold.
43
44                 
if (targetRigidbody.velocity.magnitude > m_TargetVelocityLowerLimit)
45                 {
46                     
// velocity is high enough, so we'll use the target's velocty
47                     targetForward = targetRigidbody.velocity.normalized;
48                     targetUp = Vector3.up;
49                 }
50                 
else
51                 {
52                     targetUp = Vector3.up;
53                 }
54                 m_CurrentTurnAmount = Mathf.SmoothDamp(m_CurrentTurnAmount,
1, ref m_TurnSpeedVelocityChange, m_SmoothTurnTime);
55             }
56             
else
57             {
58                 
// we're in 'follow rotation' mode, where the camera rig's rotation follows the object's rotation.
59
60                 
// This section allows the camera to stop following the target's rotation when the target is spinning too fast.
61                 
// eg when a car has been knocked into a spin. The camera will resume following the rotation
62                 
// of the target when the target's angular velocity slows below the threshold.
63                 
var currentFlatAngle = Mathf.Atan2(targetForward.x, targetForward.z)*Mathf.Rad2Deg;
64                 
if (m_SpinTurnLimit > 0)
65                 {
66                     
var targetSpinSpeed = Mathf.Abs(Mathf.DeltaAngle(m_LastFlatAngle, currentFlatAngle))/deltaTime;
67                     
var desiredTurnAmount = Mathf.InverseLerp(m_SpinTurnLimit, m_SpinTurnLimit*0.75f, targetSpinSpeed);
68                     
var turnReactSpeed = (m_CurrentTurnAmount > desiredTurnAmount ? .1f : 1f);
69                     
if (Application.isPlaying)
70                     {
71                         m_CurrentTurnAmount = Mathf.SmoothDamp(m_CurrentTurnAmount, desiredTurnAmount,
72                                                              
ref m_TurnSpeedVelocityChange, turnReactSpeed);
73                     }
74                     
else
75                     {
76                         
// for editor mode, smoothdamp won't work because it uses deltaTime internally
77                         m_CurrentTurnAmount = desiredTurnAmount;
78                     }
79                 }
80                 
else
81                 {
82                     m_CurrentTurnAmount =
1;
83                 }
84                 m_LastFlatAngle = currentFlatAngle;
85             }
86
87             
// camera position moves towards target position:
88             transform.position = Vector3.Lerp(transform.position, m_Target.position, deltaTime*m_MoveSpeed);
89
90             
// camera's rotation is split into two parts, which can have independend speed settings:
91             
// rotating towards the target's forward direction (which encompasses its 'yaw' and 'pitch')
92             
if (!m_FollowTilt)
93             {
94                 targetForward.y =
0;
95                 
if (targetForward.sqrMagnitude < float.Epsilon)
96                 {
97                     targetForward = transform.forward;
98                 }
99             }
100             
var rollRotation = Quaternion.LookRotation(targetForward, m_RollUp);
101
102             
// and aligning with the target object's up direction (i.e. its 'roll')
103             m_RollUp = m_RollSpeed >
0 ? Vector3.Slerp(m_RollUp, targetUp, m_RollSpeed*deltaTime) : Vector3.up;
104             transform.rotation = Quaternion.Lerp(transform.rotation, rollRotation, m_TurnSpeed*m_CurrentTurnAmount*deltaTime);
105         }
106     }
107 }


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