How can ı rotate camera with touch?

Question

Hi everyone ı want to rotate camera with touch.

ı tried this logic:

 Function Update()
 {
 İf(Input.GetTouch(0).phase==TouchPhase.Began)
 {
  var firstposint:Transform;
  firstpoint.position=Input.GetTouch(0).position;
  
 
 }
 if(Input.GetTouch(0).phase==TouchPhase.Stationy)
 {
   var seconpoint:Transform;
   seconpoint.position=Input.GetTouch(0).position;
   this.camera.transform.rotation.x += seconpoint.position.x - firstpoint.position.x;
   this.camera.transform.rotation.y += seconpoint.position.y - firstpoint.position.y;
 }
 }

this isnt work! ı dont understand ı am getting to first touch position for example firstpoint=20 and while ı was touching to screen ı am getting position of second touch for example seconpoint=40

and ı am setting to them differences to rotation of camera! where ı am wrong? pls help me!

Answer 1

Best Answer

Answer by zharik86 · Oct 09, 2014 at 06:08 AM

Method transform.rotation is Quaternion. For more information about quaternion see docs. I correct your code:

  private var firstpoint:Vector3; //change type on Vector3
  private var secondpoint:Vector3;

  private var xAngle: float = 0.0; //angle for axes x for rotation
  private var yAngle: float = 0.0;
  private var xAngTemp: float = 0.0; //temp variable for angle
  private var yAngTemp: float = 0.0;

  function Start() {
   //Initialization our angles of camera
   xAngle = 0.0;
   yAngle = 0.0;
   this.transform.rotation = Quaternion.Euler(yAngle, xAngle, 0.0);
  }

  function Update() {
   //Check count touches
   if(Input.touchCount > 0) {
    //Touch began, save position
    if(Input.GetTouch(0).phase == TouchPhase.Began) {
     firstpoint = Input.GetTouch(0).position;
     xAngTemp = xAngle;
     yAngTemp = yAngle;
    }
    //Move finger by screen
    if(Input.GetTouch(0).phase==TouchPhase.Moved) {
     secondpoint = Input.GetTouch(0).position;
     //Mainly, about rotate camera. For example, for Screen.width rotate on 180 degree
     xAngle = xAngTemp + (secondpoint.x - firstpoint.x) * 180.0 / Screen.width;
     yAngle = yAngTemp - (secondpoint.y - firstpoint.y) *90.0 / Screen.height;
     //Rotate camera
     this.transform.rotation = Quaternion.Euler(yAngle, xAngle, 0.0);
    }
   }
  }

Attach this script at Main Camera on your scene. Of course, you may to use Touch.deltaPosition, but I write common method. I hope, that it will help you.

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rafaelrfz · Mar 16, 2015 at 10:10 PM 0

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@zharik86 how this works. the camera rotate from some point. If the perspective camera is Orthographic, works good?.

Karios · Nov 23, 2015 at 08:41 AM 0

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It work's Pretty nicely just need to add your personal constraits

magma6770 · Mar 03, 2018 at 01:50 AM 2

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 Vector3 FirstPoint;
 Vector3 SecondPoint;
 float xAngle;
 float yAngle;
 float xAngleTemp;
 float yAngleTemp;

 void Start () {
     xAngle = 0;
     yAngle = 0;
     this.transform.rotation = Quaternion.Euler(yAngle, xAngle, 0);        
 }
 
 void Update () {
     if(Input.touchCount > 0){
         if(Input.GetTouch(0).phase == TouchPhase.Began){
             FirstPoint = Input.GetTouch(0).position;
             xAngleTemp = xAngle;
             yAngleTemp = yAngle;
         }
         if(Input.GetTouch(0).phase == TouchPhase.$$anonymous$$oved){
             SecondPoint = Input.GetTouch(0).position;
             xAngle = xAngleTemp + (SecondPoint.x - FirstPoint.x) * 180 / Screen.width;
             yAngle = yAngleTemp + (SecondPoint.y - FirstPoint.y) * 90 / Screen.height;
             this.transform.rotation = Quaternion.Euler(yAngle, xAngle, 0.0f);
         }
     }
     
 }

Here's the code provided in C# format

IgorNovik magma6770 · Oct 11, 2020 at 09:01 PM 0

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It is works fine! Thank you man. I clamped yAngle in this line for avoid overflip camera. this.transform.rotation = Quaternion.Euler(yAngle, xAngle, 0.0f);

AhmadYusaf magma6770 · Nov 24, 2020 at 08:21 AM 0

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Bro can you please tell me how to make the camera rotate only in between fixed angles in y axis .. this code is super helpful but the camera inverts scene in y axis if rotated too much .. Please Help $$anonymous$$e Bro.

bonannialberto magma6770 · Feb 01, 2021 at 12:38 AM 0

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Although this is pretty old, I am currently using a tweaked version of this code, apparently one of the few reasonable options to have touch inputs working on webgl. Despite working pretty good on iOS, it's got a bit of an offset on Android: touch.phase == began angles for both axis seems not to be stored, and every time the rotation of the camera starts from a greater x or y position than the one my finger is holding onto. It seems to have two possible reasons: a problem of sensibility (touching the screen extremely lightly seems to occasionally avoid this "jump") and a began phase that starts from the edges of the screen: when my finger is stationary in the middle, and makes little movements, jumps are almost unnoticeable.

I am trying to clamp the xAngTemp in the began phase as follows:

firstpoint = Input.GetTouch(0).position; xAngTemp = $$anonymous$$athf.Clamp(xAngle, $$anonymous$$imumX, maximumX);

I still can't make it work. Any suggestion?

Answer 2

This code really helped me a lot! I tried a few different things and this turned out to be the right answer for my project. I did have one issue. When I rotated my camera on the y-axis until it was upside down, the x-axis was reversed. Here is my update to solve the issue. I am also clamping the values to be 0 to 360. My code is also for rotating the Player, not a camera, but that can be easily changed.

My project is written in c#. @zharik86

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 
 
 public class touchCam : MonoBehaviour {
 
     private Vector3 firstpoint; 
     private Vector3 secondpoint;
     private float xAngle = 0.0f; //angle for axes x for rotation
     private float yAngle = 0.0f;
     private float xAngTemp = 0.0f; //temp variable for angle
     private float yAngTemp = 0.0f;
     private GameObject playRot;
 
 
     void  Start() {
         
         dtext=GameObject.Find("debugText").GetComponent<Text>();
 
         firstpoint = new Vector3 (0, 0, 0);
         secondpoint = new Vector3 (0, 0, 0);
 
         playRot = GameObject.Find ("Player");
     
         xAngle = 0.0f; 
         yAngle = 0.0f;
    
         transform.rotation = Quaternion.Euler(yAngle, xAngle, 0.0f);
     }
 
     void Update() {
         //Check count touches
         if (PlayerController.instance.TabletMode == 1) {
             if (Input.touchCount > 0) {
                 //Touch began, save position
                 if (Input.GetTouch (0).phase == TouchPhase.Began) {
                     firstpoint = Input.GetTouch (0).position;
                     xAngTemp = xAngle;
                     yAngTemp = yAngle;
                 }
                 //Move finger by screen
                 if (Input.GetTouch (0).phase == TouchPhase.Moved) {
                     secondpoint = Input.GetTouch (0).position;
                     //Mainly, about rotate camera. For example, for Screen.width rotate on 180 degree
                     yAngle = yAngTemp - (secondpoint.y - firstpoint.y) * 90.0f / Screen.height;
 
                     if (yAngle < 0)
                         yAngle  +=360;
                     if (yAngle > 360)
                         yAngle  -=360;
 
                     if (yAngle > 90 && yAngle < 270)
                         xAngle = xAngTemp - (secondpoint.x - firstpoint.x) * 180.0f / Screen.width;
                     else
                         xAngle = xAngTemp + (secondpoint.x - firstpoint.x) * 180.0f / Screen.width;
 
                     if (xAngle < 0)
                         xAngle  +=360;
 
                     if (xAngle > 360)
                         xAngle  -=360;
                     
                     transform.rotation = Quaternion.Euler (yAngle, xAngle, 0.0f);
 
                 }
             }
         }
     }
 }

Answer 3

Answer by rajannath · Dec 15, 2017 at 02:09 PM

using System.Collections; using System.Collections.Generic; using UnityEngine;

public class rotate : MonoBehaviour {

 float rotSpeed =20;

 void OnMouseDrag ()
 {
     float rotX = Input.GetAxis("Mouse X")*rotSpeed*Mathf.DegZRad;
     float rotY = Input.GetAxis("Mouse Y")*rotSpeed*Mathf.DegZRad;

     transform.RotateAround(Vector3.up, -rotX);
     transform.RotateAround(Vector3.right, rotY);
 }

}

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Neogene · Apr 19, 2018 at 06:38 AM 0

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Note is $$anonymous$$athf.Deg2Rad and not $$anonymous$$athf.degZRad;

Answer 4

 {
     Vector3 FirstPoint;
     Vector3 SecondPoint;
     float xAngle;
     float yAngle;
     float xAngleTemp;
     float yAngleTemp;
     public float ymax;
     public float ymin;
     
 
 
     void Start()
     {
        
 
         xAngle = 0;
         yAngle = 0;
         
 
     }
 
     void Update()
     {
        
         if (Input.touchCount > 0)
         {
             bool yclamp = false;
             if (Input.GetTouch(0).phase == TouchPhase.Began)
             {
                 FirstPoint = Input.GetTouch(0).position;
                 xAngleTemp = xAngle;
                 if(!yclamp)
                 yAngleTemp = yAngle;
             }
             if (yAngle > ymax && yAngle - yAngleTemp > 0 || yAngle < ymin && yAngle - yAngleTemp < 0)
             {
                 yclamp = true;
 
                 if (Input.GetTouch(0).phase == TouchPhase.Moved)
                 {
                     SecondPoint = Input.GetTouch(0).position;
                     xAngle = xAngleTemp + (SecondPoint.x - FirstPoint.x) * 180 / Screen.width;
                     // yAngle = yAngleTemp + (SecondPoint.y - FirstPoint.y) * 90 / Screen.height;
                     this.transform.rotation = Quaternion.Euler(yAngle, xAngle, 0.0f);
                 }
             }
             else
             {
                 if (Input.GetTouch(0).phase == TouchPhase.Moved)
                 {
                     SecondPoint = Input.GetTouch(0).position;
                     xAngle = xAngleTemp + (SecondPoint.x - FirstPoint.x) * 180 / Screen.width;
                     yAngle = yAngleTemp + (SecondPoint.y - FirstPoint.y) * 90 / Screen.height;
                     this.transform.rotation = Quaternion.Euler(yAngle, xAngle, 0.0f);
                     yclamp = false;
                 }
 
 
                 Debug.Log(yAngle);
             }
         }
 
     }
    
 }

@Jaskirat_Games this works smoothly for me to clamp y axis

Answer 5

Answer by Jaskirat_Games · Aug 31, 2019 at 06:49 AM

The above code nearly solved my problem but could anybody help me to clamp the rotation in x and y axis.@zharik86 .

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vraj95soni · Mar 31, 2020 at 08:38 PM 0

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xAngle = $$anonymous$$athf.clamp(xAngle,-180f,180f); you can change the restrictions based on your requirements and can use the same code for yAngle as well by substituting xAngle with yAngle

How can ı rotate camera with touch?

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