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Question by Greywize · Aug 27, 2021 at 03:34 PM · c#rotationunity 2d

Vector3.RotateTowards doesn't work with angles of 180 degrees

I'm trying to use Vector3.RotateTowards to rotate a Vector2 towards another Vector2. Using the following code gives me a weird bug. I'm trying to use this for turning because I want to be able to control how fast the rotation speed is. Lerp doesn't work for me because I don't want the smooth fast to slow movement.

     private void Update()
     {
         // Get movement vector from input
         m_inputDirection = movementInput.ReadValue<Vector2>();
         // Lerp the direction we want our player to head in from input direction
         m_direction = Vector3.RotateTowards(m_direction, m_inputDirection, turnSpeed, 0.0f);
 
         m_direction.Normalize();
 
         Debug.DrawLine(transform.position, m_inputDirection, new Color(0, 0, 1));
         Debug.DrawLine(transform.position, m_direction, new Color(1, 0, 0));
     }

alt text

The code works perfectly until m_direction is in the opposite direction as m_inputDirection. (Whenever they are at exactly 180 degrees of each other) Otherwise, nothing happens and the vector does not rotate.

m_inputDirection is just a Vector2 created from inputs from the keyboard.

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