Change output rotation of this Lookat script?

Question

 {
     Quaternion _lookRotation =
         Quaternion.LookRotation((to - transform.position).normalized);

     transform.rotation =
         Quaternion.Lerp(Quaternion.Euler(transform.rotation.x, transform.rotation.y, transform.rotation.z + 90), _lookRotation, Time.deltaTime * turn_speed);
 }

This will always turn from the Z side, though i'd like to have it turn from the X side? how could i change it?

full code:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class rotate : MonoBehaviour {
 
     public float turn_speed;
     public float Find_radius;
     public string TagToSearchFor;
 
     [Header ("Front, Left, Back, Top, Bottom")]
     [Tooltip("Z points to front")]
     public string Direction;
 
     
     private Collider[] all_found;
     private Transform Target;
 
     private void check() {
 
         all_found = Physics.OverlapSphere(gameObject.transform.position, Find_radius);
 
         if(all_found.Length != 0)
         {
             foreach(Collider col in all_found)
             {
                 if(col.tag == TagToSearchFor)
                 {
                     Target = col.gameObject.transform;
                     break;
                 }
             }
         }
     }
 
     protected void rotateTowards(Vector3 to)
     {
         Quaternion _lookRotation =
             Quaternion.LookRotation((to - transform.position).normalized);
 
         transform.rotation =
             Quaternion.Lerp(Quaternion.Euler(transform.rotation.x, transform.rotation.y, transform.rotation.z + 90), _lookRotation, Time.deltaTime * turn_speed);
     }
 
     private void Update()
     {
         try
         {
             rotateTowards(Target.position);
         }
         catch
         {
             check();
         }
     }
 }

Answer 1

Answer by ProtoTerminator · Dec 10, 2018 at 02:19 AM

Quaternion.LookRotation accepts a forward direction and an optional up direction. If you don't provide an up direction, it defaults to Vector3.up. So you can provide your own up direction (Vector3.right/Vector3.forward/etc).

[EDIT] After re-reading your question, it looks like you want to have the transform's X axis look at the target instead of the transform's Z axis. According to the documentation, LookRotation makes the transform look on its Z axis. So all you need to do is rotate your transform 90 degrees after you set the lookrotation. transform.rotation = Quaternion.LookRotation((transform.right - transform.position).normalized); or, even easier transform.Rotate(0, 90, 0);

[EDIT2] Here's the code (from my comment):

 protected void rotateTowards(Vector3 to)
 {
     Quaternion _lookRotation = Quaternion.LookRotation((to - transform.position).normalized);
 
     transform.Rotate(0, -90, 0);
     transform.rotation = Quaternion.Lerp(transform.rotation, _lookRotation, Time.deltaTime * turn_speed);
     transform.Rotate(0, +90, 0);
 }

In any case, it's probably easier to just parent the object you're trying to rotate under an empty gameobject, and just rotate the empty gameobject.

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TheCreatorultim · Dec 10, 2018 at 09:07 AM 0

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If i use Quaternion.LookRotation((transform.right - transform.position).normalized); It'll still look from the Z axis. While transform.Rotate(0, 90, 0); has some sort of effect, it bugs it alot.

Would that be me, or is it bugged in general?

ProtoTerminator TheCreatorultim · Dec 13, 2018 at 07:08 PM 0

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Oh I made a mistake with the lookrotation. I believe it should just be Quaternion.LookRotation(transform.right). What sort of effect does transform.Rotate have? That should simply instantly rotate it 90 degrees.

Maybe it's because you should Rotate -90 degrees before doing the lerp rotation, then after the lerp Rotate +90 degrees. I'll update my answer for that code.

Answer 2

Answer by nicholasw1816 · Dec 10, 2018 at 02:29 PM

Try this then tell me what it does. You have to declare a up direction. Try one of these till it works. Vector3(1,0,0), or Vector3(0,1,0), or Vector3(0,0,1)

 Quaternion.LookRotation((to - transform.position).normalized, Vector3(0,0,1));

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Change output rotation of this Lookat script?

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