How would I lock rotation in unity's new input sytem?

Question

I am rotating an object towards the mouse or controller using unity's new input system, using this script.

 public class HandController : MonoBehaviour
 {
 
     public void ReadMouseInput(InputAction.CallbackContext context)
     {
         Vector2 mousePosition = context.ReadValue<Vector2>();
         Vector2 objectPosition = (Vector2)Camera.main.WorldToScreenPoint(transform.position);
         Vector2 direction = (mousePosition - objectPosition).normalized;
 
         RotateAim(direction);
 
     }
 
     public void ReadStickInput(InputAction.CallbackContext context)
     {
         Vector2 stickDirection = context.ReadValue<Vector2>().normalized;
 
         RotateAim(stickDirection);
     }
 
     public void RotateAim(Vector2 direction)
     {
         float angle = Mathf.Atan2(direction.y, direction.x) * Mathf.Rad2Deg;
         transform.rotation = Quaternion.Euler(new Vector3(0, 0, angle));
     }
 }

The rotation works well, however, I would like to be able to lock the rotation by setting a range between two values in which the object can rotate. I have been trying to find ways to do this, but pretty much any way of locking rotation I've found uses the old input system in some way. Is there a way I could implement this into my script using new input system? and if so, how would I go about doing that? thanks.

Answer 1

Best Answer

Answer by AaronBacon · Dec 06, 2021 at 05:00 PM

All you need to do is use Mathf.Clamp as you're setting the rotation

For example:

⠀

      public void RotateAim(Vector2 direction)
      {
          float angle = Mathf.Atan2(direction.y, direction.x) * Mathf.Rad2Deg;
          transform.rotation = Quaternion.Euler(new Vector3(0, 0, Mathf.Clamp(angle,-75,75)));
      }

⠀

This should lock your rotation between -75 and 75 degrees for example

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falconstrike209 · Dec 06, 2021 at 05:10 PM 0

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hm...

Assets\Scripts\HandController.cs(29,71): error CS1501: No overload for method 'Clamp' takes 2 arguments

falconstrike209 · Dec 06, 2021 at 05:11 PM 0

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 public class HandController : MonoBehaviour
 {
 
     public void ReadMouseInput(InputAction.CallbackContext context)
     {
         Vector2 mousePosition = context.ReadValue<Vector2>();
         Vector2 objectPosition = (Vector2)Camera.main.WorldToScreenPoint(transform.position);
         Vector2 direction = (mousePosition - objectPosition).normalized;
 
         RotateAim(direction);
 
     }
 
     public void ReadStickInput(InputAction.CallbackContext context)
     {
         Vector2 stickDirection = context.ReadValue<Vector2>().normalized;
 
         RotateAim(stickDirection);
     }
 
     public void RotateAim(Vector2 direction)
     {
         float angle = Mathf.Atan2(direction.y, direction.x) * Mathf.Rad2Deg;
         transform.rotation = Quaternion.Euler(new Vector3(0, 0, Mathf.Clamp(-75, 75)));
     }
 }

this is the script currently

falconstrike209 falconstrike209 · Dec 06, 2021 at 05:12 PM 0

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this is for a 2d game btw

AaronBacon falconstrike209 · Dec 06, 2021 at 05:20 PM 0

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Sorry, that's my fault, Mathf.Clamp(-75,75) should be Mathf.Clamp(angle,75,-75)

I've corrected the above code now, should work

falconstrike209 · Dec 06, 2021 at 05:23 PM 0

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it's working! although, now I have another error. The object being rotated is a pair of hands that is a child to the player, with a gun as a child to the hands. The error I am having is that now that the rotation is locked, the gun isn't flipping with the player properly. do you know how I could fix this? I am flipping the player using:

     public void Flip()
     {
         if ((inputX < 0 && facingRight) || (inputX > 0 && !facingRight))
         {
             facingRight = !facingRight;
             transform.Rotate(new Vector3(0, 180, 0));
         }
     }

AaronBacon falconstrike209 · Dec 06, 2021 at 05:30 PM 0

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Ah, so I think the problem is in the HandController script the same line that locks the rotation also sets its y rotation to 0. Try modifying that RotateAim function like so

⠀

      public void RotateAim(Vector2 direction)
      {
          float angle = Mathf.Atan2(direction.y, direction.x) * Mathf.Rad2Deg;
          transform.rotation = Quaternion.Euler(new Vector3(transform.position.x, transform.position.y, Mathf.Clamp(-75, 75)));
      }

⠀

That should make it leave the other rotation values unchanged

falconstrike209 AaronBacon · Dec 06, 2021 at 05:46 PM 0

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nope, even with that changed it's still being wonk. If I leave my hand off of the things I use to aim, it will flip with the character. But as soon as I touch the right knob of a controller or the mouse, it snaps back to being flipped the other way

How would I lock rotation in unity's new input sytem?

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