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Question by Noxury · Jul 05, 2016 at 03:16 PM · timeanglerotatearound

Lerp between two angles

Hello,

I am making a hammer rotating around its X axis and its child (pivot) swinging around its Y axis. But I have 3 problems:

  1. It will not lerp within the given time from -angleMax to angleMax.

  2. it will not rotate based on timeScale multiplier; it still rotates until it reaches angleMax.

  3. The progress value should describe the progress from angleMax (0) to -angleMax (1) and vice Versa. But the value is too large, so I divided with 75.

        private var pivot : Transform;
        public var rotSpeed : float = 18f;
        public var angleMax : float = 75f;
        public var lerpTime : float = 8f;
        public var progress : float;
        public var currentX : float;
        public var isReversing : boolean;
    
        function Start () {
         pivot = transform.GetChild(0);
         pivot.rotation.eulerAngles.x = angleMax;
     
         currentX = pivot.rotation.eulerAngles.x;
     }
     
     function Update () {
         transform.RotateAround(transform.position, Vector3.up, rotSpeed * Time.deltaTime * Time.timeScale);
     
         if(progress < 1f){
             progress += (Time.deltaTime / lerpTime) * Time.timeScale;
         } else {
             progress = 0f;
             isReversing = !isReversing;
         }
     
         if(!isReversing){
             currentX = Mathf.Lerp(currentX, -angleMax, progress/75);
         } else {
             currentX = Mathf.Lerp(currentX, angleMax, progress/75);
         }
     
         pivot.localRotation.eulerAngles.x = currentX;
     }
    
    
    
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Answer by Arkaid · Jul 06, 2016 at 01:52 AM

Might be because you're lerping from currentX (instead of -angleMax) to angleMax. Try to see if this fixes it:

 currentX = Mathf.Lerp(-angleMax, angleMax, progress);
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