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Question by Bongmo · Apr 06, 2019 at 12:46 PM · rotationobjectrotateclamp

How can I clamp the object up and down rotation from 0 to -90?

Image 1 Object rotation problem 1

Image 2 Object rotation problem 2

I'm trying to rotate an object to left, right, up and down. The left and right rotation works. But the up and down rotation clamp is not working. What am I doing wrong?

 using UnityEngine;

 public class RotateHelper : MonoBehaviour
 {
     public bool rotateUp;
     public bool rotateDown;

     public bool rotateLeft;
     public bool rotateRight;

     public Transform pivotTransform;

     public float rotateSpeed;

     void Update()
     {
     
         if (rotateUp)
         {
             pivotTransform.Rotate(-(Time.deltaTime * rotateSpeed), 0, 0, Space.Self);
         }

         if (rotateDown)
         {            
             pivotTransform.Rotate(Time.deltaTime * rotateSpeed, 0, 0, Space.Self);
         }


         Vector3 pivotRotation = pivotTransform.eulerAngles;
         pivotRotation.x = Mathf.Clamp(pivotRotation.x, -90.0F, 0.0F);

         pivotTransform.eulerAngles = pivotRotation;



         if (rotateLeft)
             pivotTransform.Rotate(0, -(Time.deltaTime * rotateSpeed), 0, Space.World);


         if (rotateRight)
             pivotTransform.Rotate(0, Time.deltaTime * rotateSpeed, 0, Space.World);

     }

 }



objectroationclampproblem1.png (222.3 kB)
objectroationclampproblem2.png (46.3 kB)
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Answer by normus28 · Apr 06, 2019 at 01:53 PM

It's because you are clamping quaternion angles and thats how Unity handles rotation by default because its faster, you can read about it here: https://docs.unity3d.com/ScriptReference/Quaternion.html

It's hard to understand so most people are translating quaternion to euler angles in code (standard x, y, z rotation) that is shown in the editor in the transform window). So you have to translate the angles to euler.

so Instead of using:

 pivotRotation.x = Mathf.Clamp

Use:

 rotationX = Mathf.Clamp (pivotRotation.eulerAngles.x, -90.0F, 0.0F);
 pivot.rotation = Quaternion.Euler (rotationX, transform.eulerAngles.y, transform.eulerAngles.z);








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avatar image Bongmo · Apr 06, 2019 at 02:06 PM 0
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Thanks! This link is also helpful: https://docs.unity3d.com/$$anonymous$$anual/QuaternionAndEulerRotationsInUnity.html

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