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Question by LuisG7 · Mar 02, 2016 at 07:26 PM · c#transform

Rotate an object with Quaternion.Lerp without keeping press a key.

Hi guys. I want rotate an object 90º with Quaternion.Lerp, but I need do it just pressing a key once.

 using UnityEngine;
 using System.Collections;
 
 public class Rotator : MonoBehaviour {
     // Use this for initialization
     void Update () {
         if (Input.GetMouseButton(0)) 
         {
         
         transform.rotation = Quaternion.Lerp(transform.rotation, Quaternion.Euler( new Vector3(0,90,0)), 10*Time.deltaTime);
 
         }
  }
 }

So I need use Input.GetMouseButtonDown(0) instead of Input.GetMouseButton(0) and get the same result (or something that do what I want, rotate an object smoothly). Thanks.

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avatar image Fredex8 · Mar 02, 2016 at 11:57 PM 2
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This is what you are looking for.

$$anonymous$$onoBehaviour.StartCoroutine

I'd write a full example but there are hundreds on here already (and I'm lazy). Just search Coroutines.

avatar image LuisG7 Fredex8 · Mar 03, 2016 at 03:08 PM 0
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Thanks You! I get the information I needed here: http://answers.unity3d.com/questions/59143/quaternionlerp-inside-a-coroutine.html

$$anonymous$$y final code is this: using UnityEngine; using System.Collections;

 public class Rotatorrr : $$anonymous$$onoBehaviour {
     // Use this for initialization
 
     private float OiginalTime;
     
     void Update () {
         StartCoroutine(Rotator(1.0F));
         
         
     }
     IEnumerator Rotator (float time)
     {
 
         if (Input.Get$$anonymous$$ouseButtonDown(0)) 
         {
             OiginalTime = time;
             while (time>0)
             {
                 time -= Time.deltaTime;
                 transform.rotation = Quaternion.Lerp(transform.rotation, Quaternion.Euler( new Vector3(0,90,0)), 1-(time/OiginalTime));
                 
                 yield return new WaitForSeconds(0);
             }
         }
     }
 }

I still not being sure about how its works, even when I have "WaitForSeconds(0)" I need to use StartCoroutine and that stuff.

avatar image Fredex8 LuisG7 · Mar 03, 2016 at 11:32 PM 1
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You've got the basis of what you need there but you should run StartCoroutine(Rotator(1.0F)); on the if (Input.Get$$anonymous$$ouseButtonDown(0)) rather than calling it on update.

So you should be doing:

 void Update () {
      if (Input.Get$$anonymous$$ouseButtonDown(0)) 
      {
              StartCoroutine(Rotator(1.0F));
      }
 }

...and remove the input from the IEnumerator so it looks like this:

 IEnumerator Rotator (float time)
      {
              OiginalTime = time;
              while (time>0)
              {
                  time -= Time.deltaTime;
                  transform.rotation = Quaternion.Lerp(transform.rotation, Quaternion.Euler( new Vector3(0,90,0)), 1-(time/OiginalTime));
                  
                  yield return new WaitForSeconds(0);
              }         
      }

It will probably also be better to use a for loop rather than a while.

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