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Rotate gameobject to where camera is facing.

Discussion in 'Scripting' started by DarkEcho, Oct 23, 2017.

  1. DarkEcho

    DarkEcho

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    What I want to do, is for the gameObject to snap/face the direction (y axis) the camera is looking when a button is pressed.

    The camera is a child of the gameObject.

    The Camera
    The camera is tilted 15deg on x axis looking at the object. The camera will rotate around the object on the cameras Y axis.

    The Object
    The object will face the cameras facing direction on the Y axis. Example: The camera is currently at 15,90,0. The object, 0,0,0. When a button is pressed in this instance, the objects new current rotation will be 0,90,0.
     
    Last edited: Oct 24, 2017
    DarkEcho, Oct 23, 2017
    #1

  2. StarManta

    StarManta

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    Can you describe your goal more clearly? I'm not clear on what you want it to do.
     
    StarManta, Oct 23, 2017
    #2

  3. DarkEcho

    DarkEcho

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    Sorry for my vagueness..
    What I want to do, is for the gameObject to snap/face the direction (y axis) the camera is looking when a button is pressed.

    The camera is a child of the gameObject.
     
    DarkEcho, Oct 23, 2017
    #3

  4. DarkEcho

    DarkEcho

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    Bump
     
    DarkEcho, Oct 24, 2017
    #4

  5. MattM_Unity

    MattM_Unity

    Unity Technologies

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    Hello DarkEcho!

    Try something like this:

    Code (CSharp):
    1. using System.Collections;
    2. using System.Collections.Generic;
    3. using UnityEngine;
    4.  
    5. public class RotateToCamera : MonoBehaviour
    6. {
    7.     private GameObject MainCamera;
    8.     private float Speed = 10.0f;
    9.     private bool isRotating = false;
    10.  
    11.     void Awake ()
    12.     {
    13.         MainCamera = GameObject.FindGameObjectWithTag("MainCamera");
    14.     }
    15.  
    16.     void Update ()
    17.     {
    18.         //Set your input right here to start the rotation
    19.         if (Input.GetKeyDown(KeyCode.Space))
    20.             isRotating = !isRotating; //Starts the rotation
    21.  
    22.         if (isRotating) //Check if your game object is currently rotating
    23.             SetRotate(this.gameObject, MainCamera);
    24.  
    25.         //When your child game object and your camera have the same rotation.y value, it stops the rotation
    26.         if (toRotate.transform.rotation.eulerAngles.y == camera.transform.rotation.eulerAngles.y)
    27.             isRotating = !isRotating;
    28.     }
    29.  
    30.     void SetRotate(GameObject toRotate, GameObject camera)
    31.     {
    32.         //You can call this function for any game object and any camera, just change the parameters when you call this function
    33.         transform.rotation = Quaternion.Lerp(toRotate.transform.rotation, camera.transform.rotation, Speed * Time.deltaTime);
    34.     }
    35. }
    For this to work, make sure your camera is tagged "MainCamera". If you want to assign another tag, simply change the name of the tag in Awake.

    Simply drop this script on your game object, and press Space, your object will rotate to where the camera is facing :) You don't even have to make your game object a child of the camera for this script to work!
     
    MattM_Unity, Oct 24, 2017
    #5
    PythonPeopleexist likes this.

  6. DarkEcho

    DarkEcho

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    I have tried adapting it to my needs, but no luck. The problem is, it is rotating the object on all axis.

    The Camera
    The camera is tilted 15deg on x axis looking at the object. The camera will rotate around the object on the cameras Y axis.

    The Object
    The object will face the cameras facing direction on the Y axis. Example: The camera is currently at 15,90,0. The object, 0,0,0. When a button is pressed in this instance, the objects new current rotation will be 0,90,0.
     
    Last edited: Oct 24, 2017
    DarkEcho, Oct 24, 2017
    #6

  7. DarkEcho

    DarkEcho

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    Got it!

    Code (CSharp):
    1. transform.rotation = Quaternion.Euler(0, Camera.main.transform.eulerAngles.y, 0);
    Only problem is as the camera is a child of the object that is rotating, the camera will follow. The camera cannot move...
     
    DarkEcho, Oct 24, 2017
    #7
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  8. MattM_Unity

    MattM_Unity

    Unity Technologies

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    Could you post a few screenshots of your setup in the Scene view? It would allow me to understand your situation a bit better :)
     
    MattM_Unity, Oct 25, 2017
    #8

  9. MattM_Unity

    MattM_Unity

    Unity Technologies

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    A possible solution would be to unchild the camera from the game object, do the rotation then make the camera a child of the game object once the rotation is done.
     
    MattM_Unity, Oct 25, 2017
    #9

  10. DarkEcho

    DarkEcho

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    Ok, so I would have to do the above If i want to keep the Camera as a child, otherwise I will need to have the camera as a independent object?

    In which case I will need to script it so the camera follows the gameObject?
     
    DarkEcho, Oct 25, 2017
    #10

  11. DarkEcho

    DarkEcho

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    Bump
     
    DarkEcho, Oct 28, 2017
    #11

  12. methos5k

    methos5k

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    I personally find in nearly every situation that having the camera be separate from the followed object to be easier (to deal with, alter, etc.. ) :)
     
    methos5k, Oct 28, 2017
    #12
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  13. VRDK

    VRDK

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    Hey Matthieu ! Ashley from Success Advisor pointed me in this direction, and as the other comments says, this is not for a singular axis, but all the axis in the rotation :)


    As seen on the picture - the camera is centered at 0,0,0 while the spaceship is at the outer rim around 0,-83,0. The idea is that the cameras rotation control the position of the spaceship, meaning the spaceship rides around inside the sphere dodging asteroids and gathering fuel.

    The Problem -

    the spaceship that rides around the inside of the sphere should be able to point in the direction which the camera rotates towards. Which essentially means that the spaceship should only rotate in its Y-axis.

    Example -


    Here is my example to give the bigger picture. The camera rotates (-15, -20, 0) as you can see in the Game View it goes towards the upper left. The spaceship should therefore rotate in its Y-axis only towards that same point/direction.

    :) ive tried for a long time both with a lot of different solutions which mostly did not work. I acknowledge that im not that well versed in rotation math and in that direction - so any help is much welcomed !

    Kind Regards,
    Lars.

    Edit - The forums wont recognize my link to imgur when using the "Insert Image" nor can i direct a link to the imgur site.
     
    VRDK, Jan 14, 2019
    #13

  14. MattM_Unity

    MattM_Unity

    Unity Technologies

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    Hello VRDK!

    Not going to lie, It's hard to visualize the problem without screenshots (considering you wrote your explanations with your screenshots in mind) and it doesn't help that this forum post is over a year old ;)

    You could send me your screenshots directly in my inbox (or find a way to post them on the forums) and I'll try to give it a look as soon as I can.
     
    MattM_Unity, Jan 18, 2019
    #14

  15. VRDK

    VRDK

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    VRDK, Jan 23, 2019
    #15