a | Start value, returned when t = 0. |

b | End value, returned when t = 1. |

t | Value used to interpolate between a and b. |

**Vector3**
Interpolated value, equals to a + (b - a) * t.

Linearly interpolates between two points.

Interpolates between the points `a`

and `b`

by the interpolant `t`

. The parameter `t`

is clamped to the range [0, 1]. This is most commonly used to find a point some fraction of the way along a line between two endpoints (e.g. to move an object gradually between those points).

The value returned equals **a + (b - a) * t** (which can also be written **a * (1-t) + b*t**).

When `t`

= 0, **Vector3.Lerp(a, b, t)** returns `a`

.

When `t`

= 1, **Vector3.Lerp(a, b, t)** returns `b`

.

When `t`

= 0.5, **Vector3.Lerp(a, b, t)** returns the point midway between `a`

and `b`

.

// A short example of Vector3.Lerp usage. // Add it to an object in your scene, and at Play time it will draw in the Scene View a small yellow line between the scene origin, and a position interpolated between two other positions (one on the up axis, one on the forward axis).

using UnityEngine;

public class ExampleClass : MonoBehaviour { public int interpolationFramesCount = 45; // Number of frames to completely interpolate between the 2 positions int elapsedFrames = 0;

void Update() { float interpolationRatio = (float)elapsedFrames / interpolationFramesCount;

Vector3 interpolatedPosition = Vector3.Lerp(Vector3.up, Vector3.forward, interpolationRatio);

elapsedFrames = (elapsedFrames + 1) % (interpolationFramesCount + 1); // reset elapsedFrames to zero after it reached (interpolationFramesCount + 1)

Debug.DrawLine(Vector3.zero, Vector3.up, Color.green); Debug.DrawLine(Vector3.zero, Vector3.forward, Color.blue); Debug.DrawLine(Vector3.zero, interpolatedPosition, Color.yellow); } }

// A longer example of Vector3.Lerp usage. // Drop this script under an object in your scene, and specify 2 other objects in the "startMarker"/"endMarker" variables in the script inspector window. // At play time, the script will move the object along a path between the position of those two markers.

using UnityEngine; using System.Collections;

public class ExampleClass : MonoBehaviour { // Transforms to act as start and end markers for the journey. public Transform startMarker; public Transform endMarker;

// Movement speed in units per second. public float speed = 1.0F;

// Time when the movement started. private float startTime;

// Total distance between the markers. private float journeyLength;

void Start() { // Keep a note of the time the movement started. startTime = Time.time;

// Calculate the journey length. journeyLength = Vector3.Distance(startMarker.position, endMarker.position); }

// Move to the target end position. void Update() { // Distance moved equals elapsed time times speed.. float distCovered = (Time.time - startTime) * speed;

// Fraction of journey completed equals current distance divided by total distance. float fractionOfJourney = distCovered / journeyLength;

// Set our position as a fraction of the distance between the markers. transform.position = Vector3.Lerp(startMarker.position, endMarker.position, fractionOfJourney); } }

See Also: Slerp, LerpUnclamped.