Lerping from one position to another not working

Questions & Answers
1

Hi, Im trying to lerp from pos A to pos B or from pos B to pos A, literally moving the gameobject back and forth whenever i press a button. But whenever i press the space key, nothing happens. Can someone please help me out, im not sure what’s gone wrong.

using System.Collections;

using System.Collections.Generic;

using UnityEngine;

public class PlayerMovement : MonoBehaviour
{

// Transforms to act as start and end markers for the journey.
public Transform startMarker;
public Transform endMarker;

public Transform[] points;
public int activePoint = 0;

// 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 Awake()
{
	endMarker = points [activePoint];
	// 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()
{
	endMarker = points [activePoint].transform;
	// 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.
	if (Input.GetKey (KeyCode.Space)) 
	{
		if (activePoint == 0) 
		{
			activePoint = 1;
		}
		if (activePoint == 1) 
		{
			activePoint = 0;
		}
	}
	transform.position = Vector3.Lerp (startMarker.position, endMarker.position, fracJourney);
}

}

2

Hi @arjuniscool0204

Lerping between points has been asked many times IIRC, so use these as example.

Here one solution:

You might be better off by moving your movement code to coroutine; this way you don’t have to check anything while object is moving - let your object go from a to b, then swap the targets at the end of coroutine.

In your update:

    void Update()
    {
		if (Input.GetKeyDown(KeyCode.Space) && canStart) 
		{
			Debug.Log("Started");
			canStart = false;
			StopAllCoroutines();
			StartCoroutine(MoveTo());
		}
    }

Your coroutine:

	IEnumerator MoveTo()
	{   
		// While not there, move
		while (fraction < 1)
        {
            fraction += Time.deltaTime * speed;
            transform.position = Vector3.Lerp(start, des, fraction);
			yield return null;
        }

		// done, cleanup and swap targets		
		fraction = 0f;
		canStart = true;

		var tmp = des;
		des = start;
		start = tmp;
	}
3

Thank you so much man. I managed to make it work now!!
You saved my 2 wasteful hours of stress coding.