click to move with constant speed

Questions & Answers
1

Hi all. Been reading here a little while, very good site. I am new to unity and javascript so bare with me please. I’m working on a old point and click style adventure game and I needed a script for click to move w/ constant speed for the avatar, but I haven’t been able to find one so I figured I’d give it a shot. It compiles, but gives me a few errors when I click. Here’s the errors:

NullReferenceException
SmoothMover+$SmoothMover$24+.MoveNext () (at Assets/Scripts/SmoothMover.js:33) UnityEngine.MonoBehaviour:StartCoroutine_Auto(IEnumerator) :MoveNext() (at Assets/Scripts/SmoothMover.js:26)
UnityEngine.MonoBehaviour:StartCoroutine_Auto(IEnumerator)
$:MoveNext() (at Assets/Scripts/SmoothMover.js:14)

and the code…

private var player : Transform;

private var rayhitPoint : Vector3;

var moveSpeed : float = 1;

function Start()

      {
    	StartCoroutine("CoStart");
      }

function CoStart() : IEnumerator

{
		while (true)
		yield CoUpdate();
}

function CoUpdate() : IEnumerator

{

	 if(Input.GetKeyDown(KeyCode.Mouse0))

	{

		var hit : RaycastHit;

		var ray = Camera.main.ScreenPointToRay (Input.mousePosition); 

			if (Physics.Raycast (ray, hit))

			{

				rayhitPoint = hit.point;

				yield SmoothMover();

			}	

	}	

}

function SmoothMover() : IEnumerator

{

	var dist = Vector3.Distance(player.transform.position, rayhitPoint);

	for (i = 0.0; i < 1.0; i += (moveSpeed * Time.deltaTime) / dist) 

		{

                     transform.position = `Vector3.Lerp(player.transform.position, rayhitPoint, i);

		             yield;

		}

}

Am I not sure what’s going on here, but any insight would be greatly appreciated. Thank you.

-Ads

*edit: sorry for the formating…first post and all :slight_smile:

2

Click to move is quite simple:

// Click To Move script

// Moves the object towards the mouse position on left mouse click

var smooth:int; // Determines how quickly object moves towards position

private var targetPosition:Vector3;

function Update () {
    if(Input.GetKeyDown(KeyCode.Mouse0))
    {
        var playerPlane = new Plane(Vector3.up, transform.position);
        var ray = Camera.main.ScreenPointToRay (Input.mousePosition);
        var hitdist = 0.0;
       
        if (playerPlane.Raycast (ray, hitdist)) {
            var targetPoint = ray.GetPoint(hitdist);
            targetPosition = ray.GetPoint(hitdist);
            var targetRotation = Quaternion.LookRotation(targetPoint - transform.position);
            transform.rotation = targetRotation;
        }
    }
   
    transform.position = Vector3.Lerp (transform.position, targetPosition, Time.deltaTime * smooth);
}

You could find a lot of useful scripts here:

3

It’s not moving because your not assigning a value to “smooth”.

Set it to 1 or something in the inspector (or hard code it) then it will move.

issue is the speed is not constant wit this script, the further away from the object you click, the faster it moves.