Problem with Lerp/Slerp

Questions & Answers
1

I know there are similar questions to this and I have probably read them. The issue is that nothing I’ve tried seems to work. I currently am just trying to do a simple movement of a cube around a open plane using touch features. I have the touch controls working and the cube does move. However, it instantaneously moves and rotates to its new position. I want it to accelerate towards the target point and then slow as it approaches it. I have been told that Lerp could be used but adding it in to the program didn’t seem to accomplish anything. (Sorry for the unorganized question, I have a horrible time communicating problems). My code is below. I know its unorganized and probably inefficient but I’m not trying to do anything groundbreaking as I am still learning all the ins and outs of Unity. Not looking for someone to do the code for me, just looking for a push in the right direction would be great thanks.

    var touch : Touch;
    if (Input.touchCount > 0) {
    	if (Input.GetTouch(0).phase == TouchPhase.Moved){
    		var primarytouch : Touch = Input.GetTouch(0);
    		var speed = primarytouch.deltaPosition/primarytouch.deltaTime;
    		}
    		
         if (Input.GetTouch(0).phase == TouchPhase.Ended){
        var finishedtouch : Touch = Input.GetTouch(0);
        var ray : Ray = Camera.main.ScreenPointToRay(finishedtouch.position);
        
        var controller : CharacterController = GetComponent(CharacterController);
        var hit : RaycastHit;
        var moveDirection : Vector3 = Vector3.zero;
       
        if (Physics.Raycast(ray,hit,100))
        {
        var startPos = transform.position;
        var targetPoint = hit.point;
        var targetRotation = Quaternion.LookRotation(targetPoint - transform.position, Vector3.up);
        transform.rotation = Quaternion.Slerp(transform.rotation, targetRotation, Time.time *2.0);   
        transform.position = Vector3.Lerp(startPos, hit.point, Time.time * 10);
        
    	}   
}
}
}
2

You are falling into the classic trap of using Slerp with Time.time - that is the amount of time since the game started and if it is more than 1 second you will find you snap directly to the ending position:

The last parameter of Slerp needs to be a float between 0 and 1.

Either :

  • Use Time.deltaTime - this will give you a damping effect toward the target

  • Create a variable of type float. Initialize it to 0 when you start the move, add Time.deltaTime on to it.