Version: 2019.2
LanguageEnglish
  • C#

Vector3.Lerp

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

Description

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 (b - a) * t. When t = 0 returns a. When t = 1 returns b. When t = 0.5 returns the point midway between a and b.

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.

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