Camera Follow player and rotate around using A and D keybuttons

Camera & Cinematics Camera
1

Hey basically im trying to make a camera that follows the player(already works) and then i can use the A and D keys to rotate around the player left or right. the problem is that the camera doesnt actually rotate around, it kinda of zooms in and out. here’s the code;

using UnityEngine;
using System.Collections;

public class CameraFollow : MonoBehaviour {

    public Transform target;

    //camera will follow the target.

    //camera is going to be that many units from the player
   
    public float Height = 10;
    public float radius = 10;
    public float angle = 0;
    public float rotationalSpeed = 1;


    // Use this for initialization
    void Start () {
   
    }
   
    // Update is called once per frame
    void Update ()
    {

        float cameraX = target.position.x + (radius * Mathf.Cos(angle));
        float cameraY = target.position.y + Height;
        float cameraZ = target.position.z + (radius * Mathf.Cos(angle));

        transform.position = new Vector3(cameraX, cameraY, cameraZ);

        if (Input.GetKey(KeyCode.A))
        {
            angle = angle - rotationalSpeed * Time.deltaTime;
        }//end of if
        else if (Input.GetKey(KeyCode.D))
        {
            angle = angle + rotationalSpeed * Time.deltaTime;
        }//end of else if

        transform.LookAt(target.position);

    }//end of update
}//end of CameraFollow Class

the target is set to be the gameobject of player in the scene yet it doesnt rotate aorund the y axis around him. any ideas?

2 
float cameraZ = target.position.z + (radius * Mathf.Sin(angle));

You’ll probably also have to convert the angle to radians first with * Mathf.Deg2Rad

3

Your basically taking a circle slice around the player then moving it up 10 units. So to get the x,z co-ordinates picture them as x,y points around a circle centered at the origin with radius R

z = sin(angle)
x= cos (angle)

Since you were taking cosine both times you were just geting the x-component each time so it the camera would act like a spring along the x=z line zooming in and out as you pressed A,D.

Here’s a fixed version that also converts the degrees to radians. You will need to adjust the rotational speed accordingly. I have it setup in degrees per second, which seems the easiest to use.

using UnityEngine;
using System.Collections;

public class CameraFollow : MonoBehaviour
{

    public Transform target;

    //camera will follow the target.

    //camera is going to be that many units from the player

    public float Height = 10;
    public float radius = 10;
    public float angle = 0;

    // make this in degrees per Second
    // Setting it to 36 = 10 seconds to fully rotate around
    public float rotationalSpeed = 36f;

    // Update is called once per frame
    void Update()
    {
       
        float cameraX = target.position.x + (radius * Mathf.Cos(Mathf.Deg2Rad*angle));
        float cameraY = target.position.y + Height;
        float cameraZ = target.position.z + (radius * Mathf.Sin(Mathf.Deg2Rad*angle));

        transform.position = new Vector3(cameraX, cameraY, cameraZ);

        if (Input.GetKey(KeyCode.A))
        {
            angle = angle - rotationalSpeed * Time.deltaTime;
        }//end of if
        else if (Input.GetKey(KeyCode.D))
        {
            angle = angle + rotationalSpeed * Time.deltaTime;
        }//end of else if

        transform.LookAt(target.position);

    }//end of update
}//end of CameraFollow Class