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Question by kollosuss13 · Feb 06, 2020 at 06:48 PM · c#scripting problemrotate

[HELP] How to smoothly rotate camera 180 degrees on key enter?

Hello, i want to rotate camera from 0 to 180 degrees when i press W for example and when i press again it's rotates to 360. I have a script but i only did one time rotate. Please help. Script below

 using UnityEngine;
  using System.Collections;
  
  public class RotChange : MonoBehaviour {
  
      float rot_duration = 500F; 
      float rot_speed = 0.25F; 
      Quaternion final_rot;
  
      // Use this for initialization
      void Start () {
          Vector3 initial_rot = transform.rotation.eulerAngles;
          final_rot = Quaternion.Euler(new Vector3(initial_rot.x,initial_rot.y,180)); 
      }
  
      IEnumerator rotateOBJ ()
      {
          float rot_elapsedTime = 0.0F;
          while (rot_elapsedTime  < rot_duration)
          {
              transform.rotation = Quaternion.Slerp(transform.rotation,final_rot,rot_elapsedTime);
              rot_elapsedTime  += Time.deltaTime*rot_speed;
              yield return null;
          }
      }
  
      // Update is called once per frame
      void Update () {
          if (Input.GetKeyDown("w")) StartCoroutine("rotateOBJ");
      }
  }
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Answer by unity_ek98vnTRplGj8Q · Feb 06, 2020 at 06:59 PM

It's because you only calculate your final rotation once at the start. If you want to rotate 180 degree's every time you press the key, do something like this

  using System.Collections;
  using UnityEngine;
 
  public class RotChange : MonoBehaviour {
 
      float rot_duration = 500F;
      float rot_speed = 0.25F;
      Quaternion final_rot;
 
      // Use this for initialization
      void Start () {
          final_rot = transform.rotation;
      }
 
      IEnumerator rotateOBJ () {
          final_rot = final_rot * Quaternion.Euler (0, 0, 180);
          float rot_elapsedTime = 0.0F;
          while (rot_elapsedTime < rot_duration) {
              transform.rotation = Quaternion.Slerp (transform.rotation, final_rot, rot_elapsedTime);
              rot_elapsedTime += Time.deltaTime * rot_speed;
              yield return null;
          }
      }
 
      // Update is called once per frame
      void Update () {
          if (Input.GetKeyDown ("w")) StartCoroutine ("rotateOBJ");
      }
  }
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avatar image kollosuss13 · Feb 06, 2020 at 07:07 PM 0
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Thanks! But with every rotation speed getting bigger, whats wrong?

avatar image unity_ek98vnTRplGj8Q kollosuss13 · Feb 06, 2020 at 07:53 PM 0
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Why do you have both a rotation speed and a rotation duration? If you want your rotation to take rot_duration time to complete do

 transform.rotation = Quaternion.Slerp (transform.rotation, final_rot, rot_elapsedTime/rot_duration);
              rot_elapsedTime += Time.deltaTime;


If you want your rotation to rotate according to the speed variable use

              transform.rotation = Quaternion.Slerp (transform.rotation, final_rot, rot_speed*Time.deltaTime);

avatar image kollosuss13 unity_ek98vnTRplGj8Q · Feb 06, 2020 at 08:10 PM 0
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still rotation's speed getting bigger with every rotation

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