Clamping movement causes jittering

Question

So I have a ship that moves like this:

 void FixedUpdate()
         {
             float moveHorizontal = Input.GetAxis("Horizontal");
             float moveVertical = Input.GetAxis("Vertical");
     
             Vector3 movement = new Vector3(moveHorizontal , moveVertical, Mathf.Max(rb.velocity.z, forwardSpeed));
             rb.velocity = movement * speed;
     
             transform.position = new Vector3
             (
                 Mathf.Clamp(rb.position.x, moveBoundary.xMin, moveBoundary.xMax),
                 Mathf.Clamp(rb.position.y, moveBoundary.yMin, moveBoundary.yMax),
                 rb.position.z
             );
             
             transform.rotation = Quaternion.Euler(rb.velocity.y * -tilt, rb.velocity.x * tilt, rb.velocity.x * -tilt);
         }

(moveboundary is a Boundary which just has 4 float parameters)

But when I bump the player against the boundary I get jittering. Should I not be using physics for this movement?

Answer 1

The problem is that your velocity against the invisible wall is still greater than zero, therefore you're constantly going past it and having to be reset back. You should instead detect when the boundary has been reached and make sure your relative velocity is either zero or moving away from it.

 Vector3 movement = new Vector3(moveHorizontal, moveVertical, Mathf.Max(rb.velocity.z, forwardSpeed));
         Vector3 velocity = movement * speed;
         Vector3 position = rb.position;
 
         if (position.x < moveBoundary.xMin)
         {
             position.x = moveBoundary.xMin;
             velocity.x = Mathf.Max(velocity.x, 0f);
         }
         else if (position.x > moveBoundary.xMax)
         {
             position.x = moveBoundary.xMax;
             velocity.x = Mathf.Min(velocity.x, 0f);
         }
 
         if (position.y < moveBoundary.yMin)
         {
             position.y = moveBoundary.yMin;
             velocity.y = Mathf.Max(velocity.y, 0f);
         }
         else if (position.y > moveBoundary.yMax)
         {
             position.y = moveBoundary.yMax;
             velocity.y = Mathf.Min(velocity.y, 0f);
         }
 
         rb.velocity = velocity;
         transform.position = position;
         transform.rotation = Quaternion.Euler(rb.velocity.y * -tilt, rb.velocity.x * tilt, rb.velocity.x * -tilt);

Clamping movement causes jittering

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