Legacy Documentation: Version 2018.1 (Go to current version)
LanguageEnglish
  • C#
  • JS

Script language

Select your preferred scripting language. All code snippets will be displayed in this language.

Vector3.Lerp

Suggest a change

Success!

Thank you for helping us improve the quality of Unity Documentation. Although we cannot accept all submissions, we do read each suggested change from our users and will make updates where applicable.

Close

Submission failed

For some reason your suggested change could not be submitted. Please <a>try again</a> in a few minutes. And thank you for taking the time to help us improve the quality of Unity Documentation.

Close

Cancel

public static method Lerp(a: Vector3, b: Vector3, t: float): Vector3;
public static Vector3 Lerp(Vector3 a, Vector3 b, float t);

Description

Linearly interpolates between two vectors.

Interpolates between the vectors 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).

When t = 0 returns a. When t = 1 returns b. When t = 0.5 returns the point midway between a and b.

#pragma strict
public var startMarker: Transform;
public var endMarker: Transform;
public var speed: float = 1.0F;
private var startTime: float;
private var journeyLength: float;
function Start() {
	// Keep a note of the time the movement started.
	startTime = Time.time;
	// Calculate the journey length.
	journeyLength = Vector3.Distance(startMarker.position, endMarker.position);
}
// Follows the target position like with a spring
function Update() {
	// Distance moved = time * speed.
	var distCovered: float = (Time.time - startTime) * speed;
	// Fraction of journey completed = current distance divided by total distance.
	var fracJourney: float = distCovered / journeyLength;
	// Set our position as a fraction of the distance between the markers.
	transform.position = Vector3.Lerp(startMarker.position, endMarker.position, fracJourney);
}
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/sec. 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); }

// Follows the target position like with a spring void Update() { // Distance moved = time * speed. float distCovered = (Time.time - startTime) * speed;

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

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

See Also: Slerp, LerpUnclamped.

Did you find this page useful? Please give it a rating: