Lerp
How do I use Lerp
Below are practical examples compiled from projects for learning and reference purposes
Featured Snippets
File name: ClickAndDrag.cs
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11 void Update ()
12 {
13 if (!photonView.isMine)
14 {
15 return;
16 }
17
18 InputToEvent input = Camera.main.GetComponent
19 if (input == null) return;
20 if (!following)
21 {
22 if (input.Dragging)
23 {
24 camOnPress = this.transform.position;
25 following = true;
26 }
27 else
28 {
29 return;
30 }
31 }
32 else
33 {
34 if (input.Dragging)
35 {
36 Vector3 target = camOnPress - (new Vector3(input.DragVector.x, 0, input.DragVector.y) * factor);
37 this.transform.position = Vector3.Lerp(this.transform.position, target, Time.deltaTime*.5f);
38 }
39 else
40 {
41 camOnPress = Vector3.zero;
42 following = false;
43 }
44 }
45 }
File name: MoveCam.cs
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22 private void Update()
23 {
24 camTransform.position = Vector3.Slerp(camTransform.position, randomPos, Time.deltaTime);
25 camTransform.LookAt(lookAt);
26 if (Vector3.Distance(camTransform.position, randomPos) < 0.5f)
27 {
28 randomPos = originalPos + new Vector3(Random.Range(-2, 2), Random.Range(-2, 2), Random.Range(-1, 1));
29 }
30 }
File name: DemoMecanimGUI.cs
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33 public void Update()
34 {
35 FindRemoteAnimator();
36
37 m_SlideIn = Mathf.Lerp( m_SlideIn, m_IsOpen ? 1f : 0f, Time.deltaTime * 9f );
38 m_FoundPlayerSlideIn = Mathf.Lerp( m_FoundPlayerSlideIn, m_AnimatorView == null ? 0f : 1f, Time.deltaTime * 5f );
39 }
File name: PickupController.cs
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151 void Update()
152 {
153 if (isControllable)
154 {
155 if (Input.GetButtonDown("Jump"))
156 {
157 lastJumpButtonTime = Time.time;
158 }
159
160 UpdateSmoothedMovementDirection();
161
162 // Apply gravity
163 // - extra power jump modifies gravity
164 // - controlledDescent mode modifies gravity
165 ApplyGravity();
166
167 // Apply jumping logic
168 ApplyJumping();
169
170
171 // Calculate actual motion
172 Vector3 movement = moveDirection * moveSpeed + new Vector3(0, verticalSpeed, 0) + inAirVelocity;
173 movement *= Time.deltaTime;
174
175 //Debug.Log(movement.x.ToString("0.000") + ":" + movement.z.ToString("0.000"));
176
177 // Move the controller
178 CharacterController controller = GetComponent
179 collisionFlags = controller.Move(movement);
180
181 }
182
183 // PUN: if a remote position is known, we smooth-move to it (being late(r) but smoother)
184 if (this.remotePosition != Vector3.zero)
185 {
186 transform.position = Vector3.Lerp(transform.position, this.remotePosition, Time.deltaTime * this.RemoteSmoothing);
187 }
188
189 velocity = (transform.position - lastPos)*25;
190
191 // ANIMATION sector
192 if (_animation)
193 {
194 if (_characterState == PickupCharacterState.Jumping)
195 {
196 if (!jumpingReachedApex)
197 {
198 _animation[jumpPoseAnimation.name].speed = jumpAnimationSpeed;
199 _animation[jumpPoseAnimation.name].wrapMode = WrapMode.ClampForever;
200 _animation.CrossFade(jumpPoseAnimation.name);
201 }
202 else
203 {
204 _animation[jumpPoseAnimation.name].speed = -landAnimationSpeed;
205 _animation[jumpPoseAnimation.name].wrapMode = WrapMode.ClampForever;
206 _animation.CrossFade(jumpPoseAnimation.name);
207 }
208 }
209 else
210 {
211 if (_characterState == PickupCharacterState.Idle)
212 {
213 _animation.CrossFade(idleAnimation.name);
214 }
215 else if (_characterState == PickupCharacterState.Running)
216 {
217 _animation[runAnimation.name].speed = runMaxAnimationSpeed;
218 if (this.isControllable)
219 {
220 _animation[runAnimation.name].speed = Mathf.Clamp(velocity.magnitude, 0.0f, runMaxAnimationSpeed);
221 }
222 _animation.CrossFade(runAnimation.name);
223 }
224 else if (_characterState == PickupCharacterState.Trotting)
225 {
226 _animation[walkAnimation.name].speed = trotMaxAnimationSpeed;
227 if (this.isControllable)
228 {
229 _animation[walkAnimation.name].speed = Mathf.Clamp(velocity.magnitude, 0.0f, trotMaxAnimationSpeed);
230 }
231 _animation.CrossFade(walkAnimation.name);
232 }
233 else if (_characterState == PickupCharacterState.Walking)
234 {
235 _animation[walkAnimation.name].speed = walkMaxAnimationSpeed;
236 if (this.isControllable)
237 {
238 _animation[walkAnimation.name].speed = Mathf.Clamp(velocity.magnitude, 0.0f, walkMaxAnimationSpeed);
239 }
240 _animation.CrossFade(walkAnimation.name);
241 }
242
243 if (_characterState != PickupCharacterState.Running)
244 {
245 _animation[runAnimation.name].time = 0.0f;
246 }
247 }
248 }
249 // ANIMATION sector
250
251 // Set rotation to the move direction
252 if (IsGrounded())
253 {
254 // a specialty of this controller: you can disable rotation!
255 if (DoRotate)
256 {
257 transform.rotation = Quaternion.LookRotation(moveDirection);
258 }
259 }
260 else
261 {
262 /* This causes choppy behaviour when colliding with SIDES
263 * Vector3 xzMove = velocity;
264 xzMove.y = 0;
265 if (xzMove.sqrMagnitude > 0.001f)
266 {
267 transform.rotation = Quaternion.LookRotation(xzMove);
268 }*/
269 }
270
271 // We are in jump mode but just became grounded
272 if (IsGrounded())
273 {
274 lastGroundedTime = Time.time;
275 inAirVelocity = Vector3.zero;
276 if (jumping)
277 {
278 jumping = false;
279 SendMessage("DidLand", SendMessageOptions.DontRequireReceiver);
280 }
281 }
282
283 lastPos = transform.position;
284 }
File name: CubeInter.cs
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79 // This only runs where the component is enabled, which is only on remote peers (server/clients)
80 void Update()
81 {
82 double currentTime = PhotonNetwork.time;
83 double interpolationTime = currentTime - interpolationBackTime;
84 // We have a window of interpolationBackTime where we basically play
85 // By having interpolationBackTime the average ping, you will usually use interpolation.
86 // And only if no more data arrives we will use extrapolation
87
88 // Use interpolation
89 // Check if latest state exceeds interpolation time, if this is the case then
90 // it is too old and extrapolation should be used
91 if (m_BufferedState[0].timestamp > interpolationTime)
92 {
93 for (int i = 0; i < m_TimestampCount; i++)
94 {
95 // Find the state which matches the interpolation time (time+0.1) or use last state
96 if (m_BufferedState[i].timestamp <= interpolationTime || i == m_TimestampCount - 1)
97 {
98 // The state one slot newer (<100ms) than the best playback state
99 State rhs = m_BufferedState[Mathf.Max(i - 1, 0)];
100 // The best playback state (closest to 100 ms old (default time))
101 State lhs = m_BufferedState[i];
102
103 // Use the time between the two slots to determine if interpolation is necessary
104 double length = rhs.timestamp - lhs.timestamp;
105 float t = 0.0F;
106 // As the time difference gets closer to 100 ms t gets closer to 1 in
107 // which case rhs is only used
108 if (length > 0.0001)
109 t = (float)((interpolationTime - lhs.timestamp) / length);
110
111 // if t=0 => lhs is used directly
112 transform.localPosition = Vector3.Lerp(lhs.pos, rhs.pos, t);
113 transform.localRotation = Quaternion.Slerp(lhs.rot, rhs.rot, t);
114 return;
115 }
116 }
117 }
118 // Use extrapolation. Here we do something really simple and just repeat the last
119 // received state. You can do clever stuff with predicting what should happen.
120 else
121 {
122 State latest = m_BufferedState[0];
123
124 transform.localPosition = Vector3.Lerp(transform.localPosition, latest.pos, Time.deltaTime * 20 );
125 transform.localRotation = latest.rot;
126 }
127 }
File name: CubeLerp.cs
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61 public void Update()
62 {
63 // We get 10 updates per sec. sometimes a few less or one or two more, depending on variation of lag.
64 // Due to that we want to reach the correct position in a little over 100ms. This way, we usually avoid a stop.
65 // Lerp() gets a fraction value between 0 and 1. This is how far we went from A to B.
66 //
67 // Our fraction variable would reach 1 in 100ms if we multiply deltaTime by 10.
68 // We want it to take a bit longer, so we multiply with 9 instead.
69
70 fraction = fraction + Time.deltaTime * 9;
71 transform.localPosition = Vector3.Lerp(onUpdatePos, latestCorrectPos, fraction); // set our pos between A and B
72 }
File name: ThirdPersonNetwork.cs
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52 void Update()
53 {
54 if (!photonView.isMine)
55 {
56 //Update remote player (smooth this, this looks good, at the cost of some accuracy)
57 transform.position = Vector3.Lerp(transform.position, correctPlayerPos, Time.deltaTime * 5);
58 transform.rotation = Quaternion.Lerp(transform.rotation, correctPlayerRot, Time.deltaTime * 5);
59 }
60 }
File name: NetworkCharacter.cs
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8 void Update()
9 {
10 if (!photonView.isMine)
11 {
12 transform.position = Vector3.Lerp(transform.position, this.correctPlayerPos, Time.deltaTime * 5);
13 transform.rotation = Quaternion.Lerp(transform.rotation, this.correctPlayerRot, Time.deltaTime * 5);
14 }
15 }
File name: PlayerDiamond.cs
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62 void UpdateDiamondPosition()
63 {
64 Vector3 targetPosition = Vector3.zero;
65
66 if( HeadTransform != null )
67 {
68 targetPosition = HeadTransform.position;
69 }
70
71 targetPosition.y = m_Height;
72
73 if( float.IsNaN( targetPosition.x ) == false && float.IsNaN( targetPosition.z ) == false )
74 {
75 transform.position = Vector3.Lerp( transform.position, targetPosition, Time.deltaTime * 10f );
76 }
77 }
File name: PhotonAnimatorViewEditor.cs
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179 private void DrawParameterInspector()
180 {
181 SerializedProperty foldoutProperty = serializedObject.FindProperty("ShowParameterInspector");
182 foldoutProperty.boolValue = PhotonGUI.ContainerHeaderFoldout("Synchronize Parameters", foldoutProperty.boolValue);
183
184 if (foldoutProperty.boolValue == false)
185 {
186 return;
187 }
188
189 float lineHeight = 20;
190 Rect containerRect = PhotonGUI.ContainerBody(GetParameterCount()*lineHeight);
191
192 for (int i = 0; i < GetParameterCount(); i++)
193 {
194 AnimatorControllerParameter parameter = null;
195
196#if UNITY_4_0 || UNITY_4_0_1 || UNITY_4_1 || UNITY_4_2 || UNITY_4_3 || UNITY_4_5 || UNITY_4_6
197 parameter = this.m_Controller.GetParameter(i);
198#else
199 parameter = m_Animator.parameters[ i ];
200#endif
201
202 string defaultValue = "";
203
204 if (parameter.type == AnimatorControllerParameterType.Bool)
205 {
206 defaultValue += parameter.defaultBool.ToString();
207 }
208 else if (parameter.type == AnimatorControllerParameterType.Float)
209 {
210 defaultValue += parameter.defaultFloat.ToString();
211 }
212 else if (parameter.type == AnimatorControllerParameterType.Int)
213 {
214 defaultValue += parameter.defaultInt.ToString();
215 }
216
217 if (this.m_Target.DoesParameterSynchronizeTypeExist(parameter.name) == false)
218 {
219 this.m_Target.SetParameterSynchronized(parameter.name, (PhotonAnimatorView.ParameterType) parameter.type, PhotonAnimatorView.SynchronizeType.Disabled);
220 EditorUtility.SetDirty(this.m_Target);
221 }
222
223 PhotonAnimatorView.SynchronizeType value = this.m_Target.GetParameterSynchronizeType(parameter.name);
224
225 Rect elementRect = new Rect(containerRect.xMin, containerRect.yMin + i*lineHeight, containerRect.width, lineHeight);
226
227 Rect labelRect = new Rect(elementRect.xMin + 5, elementRect.yMin + 2, EditorGUIUtility.labelWidth - 5, elementRect.height);
228 GUI.Label(labelRect, parameter.name + " (" + defaultValue + ")");
229
230 Rect popupRect = new Rect(elementRect.xMin + EditorGUIUtility.labelWidth, elementRect.yMin + 2, elementRect.width - EditorGUIUtility.labelWidth - 5, EditorGUIUtility.singleLineHeight);
231 value = (PhotonAnimatorView.SynchronizeType) EditorGUI.EnumPopup(popupRect, value);
232
233 if (i < GetParameterCount() - 1)
234 {
235 Rect splitterRect = new Rect(elementRect.xMin + 2, elementRect.yMax, elementRect.width - 4, 1);
236 PhotonGUI.DrawSplitter(splitterRect);
237 }
238
239 if (value != this.m_Target.GetParameterSynchronizeType(parameter.name))
240 {
241 Undo.RecordObject(target, "Modify Synchronize Parameter " + parameter.name);
242 this.m_Target.SetParameterSynchronized(parameter.name, (PhotonAnimatorView.ParameterType) parameter.type, value);
243
244 EditorUtility.SetDirty(this.m_Target);
245 }
246 }
247 }
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