limit rotation to 90 degree on one axis

I haven't tested it myself, but I think what you are looking for are eulerangles:

 var xRotation = this.gameObject.transform.rotation.eulerAngles.x;
 if (xRotation <= 90)
 {
     this.gameObject.transform.Rotate(new Vector3(90,0,0))
 }

You should use Mathf.Clamp described here : https://docs.unity3d.com/ScriptReference/Mathf.Clamp.html.

You want to do it this way :

float limitedRotation = Mathf.Clamp(limitedRotation, 0, 90); And then in code where you want to limit z axis you just put clamped float -> limitedRotation.

THanks @mlnczk & @ShadowUser19 it worked in this way. i made bool variable name as movement and when movement true,i called the Moment () ftn . " bool movement = false; void Update() { if ( movement == true) { Movement(); } . } void Movement() { if (this.gameObject.transform.eulerAngles.x >= 89.5f) { movement = false; } else {
float move = Time.deltaTime + speed; transform.Rotate (Vector3.right * move); }

} "