Question by KillerPenguin · Sep 25, 2017 at 02:10 AM · physics transform positioning jittering gun movement

Why is this causing weird stutter/jitter?

So I'm working on a project and I got to working on this weapon slide. In a parent class I'm checking to see where the hand is grabbing with:

     public Vector3 ClosestPoint(Vector3 startPoint, Vector3 endPoint, Vector3 tPoint)
     {
         Vector3 startPointTotPointVector = tPoint - startPoint;
         Vector3 startPointToEndPointVector = (endPoint - startPoint).normalized;

         float d = Vector3.Distance(startPoint, endPoint);
         float t = Vector3.Dot(startPointToEndPointVector, startPointTotPointVector);

         if (t <= 0)
             return startPoint;

         if (t >= d)
             return endPoint;

         Vector3 distanceAlongVector = startPointToEndPointVector * t;

         Vector3 closestPoint = startPoint + distanceAlongVector;

         return closestPoint;
     }

On update I'm checking to see if the slide is held and if it is I get the controllers local transform and set the slides local position with the following code:

         switch (this.currentState)
         {
             case CurrentSlideState.Held:

                 Vector3 grabHand = this.transform.InverseTransformPoint(attachPointTransform.transform.position);

                 if (currentPosition != CurrentPosition.Max)
                 {
                     this.transform.localPosition = Handgun.ClosestPoint(Handgun.slideMin, Handgun.slideMax, grabHand);
                     break;
                 }
                 break;
         }

But the problem is when it is held it tends to jitter like this: https://www.youtube.com/watch?v=_Dm7NMYroCw&feature=youtu.be

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