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Unity camera follows player script

I'm pretty new to Unity. I tried to create a script that the camera would follow the actor (with a little difference). Is there a way to improve the code? It works just fine. But I wonder if I did it the best way. I want to do it about as I wrote, so if you have any tips. Thank you
Maybe change Update to FixedUpdate ?
public GameObject player;
// Start is called before the first frame update
void Start()
{
player = GameObject.Find("Cube"); // The player
}
// Update is called once per frame
void Update()
{
transform.position = new Vector3(player.transform.position.x, player.transform.position.y + 5, player.transform.position.z - 10);
}

Making the camera following the player is quite straight forward.
Add this script to your main camera.
Drag the reference of the player object to the script and then you are done.
You can change the values in the Vector 3 depending on how far you want the camera to be from the player.
using UnityEngine;
public class Follow_player : MonoBehaviour {
public Transform player;
// Update is called once per frame
void Update () {
transform.position = player.transform.position + new Vector3(0, 1, -5);
}
}

Follows player in the back constantly when the player rotates, no parenting needed, with smoothing.
Piece of Knowledges:
Apparently, Quaternion * Vector3 is going to rotate the point of the Vector3 around the origin of the Vector3 by the angle of the Quaternion
The Lerp method in Vector3 and Quaternion stand for linear interpolation, where the first parameter gets closer to the second parameter by the amount of third parameter each frame.
using UnityEngine;
public class CameraFollow : MonoBehaviour
{
public Transform target;
public float smoothSpeed = 0.125f;
public Vector3 locationOffset;
public Vector3 rotationOffset;
void FixedUpdate()
{
Vector3 desiredPosition = target.position + target.rotation * locationOffset;
Vector3 smoothedPosition = Vector3.Lerp(transform.position, desiredPosition, smoothSpeed);
transform.position = smoothedPosition;
Quaternion desiredrotation = target.rotation * Quaternion.Euler(rotationOffset);
Quaternion smoothedrotation = Quaternion.Lerp(transform.rotation, desiredrotation, smoothSpeed);
transform.rotation = smoothedrotation;
}
}

This will always follow the player from the same direction, and if the player rotates it will still stay the same. This may be good for top-down or side-scrolling view, but the camera setup seems to be more fitting for 3rd person, in which case you'd want to rotate the camera when the player turns.
The easiest way to do this is actually not with code alone, simply make the camera a child of the player object, that way its position relative to the player will always stay the same!
If you do want to do it through code, you can change the code to be like this:
void Update()
{
Vector3 back = -player.transform.forward;
back.y = 0.5f; // this determines how high. Increase for higher view angle.
transform.position = player.transform.position - back * distance;
transform.forward = player.transform.position - transform.position;
}
You get the direction of the back of the player (opposite of transform's forward). Then you increase the height a little so the angle will be a bit from above like in your example. Last you set the camera's position to be the player's position and add the back direction multiplied by the distance. That will place the camera behind the player.
You also need to rotate the camera so it points at the player, and that's the last line - setting the camera's forward direction to point at the player.

Here is just another option. I always find it easier to have the variables which are populated in the inspector so you can adjust it and fine tune it as needed.
public GameObject player;
[SerializeField]
private float xAxis, yAxis, zAxis;
private void Update()
{
transform.position = new Vector3(player.transform.position.x + xAxis, player.transform.position.y + yAxis, player.transform.position.z + zAxis);
}

Clamping an object axis in Vuforia AR camera

screenshot hereI want to clamp Y-axis on a cube. I can do it in Unity camera. But, it does not react correctly when I am using it in Vuforia camera.
My problem was that the cube follows the camera. I would like the cube to stay in its position and ignore the AR camera position. I sense it has something to do with WorldtoViewpoint but I cannot figure it out. Can you teach me how to do this please? thankyou
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class ClampMovementController : MonoBehaviour
{
// Start is called before the first frame update
void Start()
{
}
// Update is called once per frame
void Update()
{
Vector3 pos = transform.localPosition;
pos.y = Mathf.Clamp(transform.position.y, 0f, 0f);
transform.localPosition = pos;
}
}

This is my solution:
Actually its very simple. The INcorrect concept was my object attached to the AR camera, hence, object position is always moving related to camera position. Now. In order to make the object stays in its place. I need to get its localPosition. First. Store the localposition in Vector3 pos. And then do modification on Vector3 pos. At last, reassign the new value to the object localposition.
public class ClampMovementController : MonoBehaviour
{
public float currentPos;
public GameObject capsule;
void Update()
{
//store the value of object localPosition
Vector3 pos = capsule.transform.localPosition;
//modification on the value
pos.y = Mathf.Clamp(pos.y, currentPos, currentPos);
//rerassign the new value to the object localPosition
capsule.transform.localPosition = pos;
}
}

First of all your cube is moving with the camera because your image target is child of your ARCamera. Therefore, when you move the camera image target moves, then your cube moves as well. Make sure your ImageTarget has no parent.
I did not understand why you have to lock any movement in Y axis. I guess you are doing something wrong with lean touch when you move object. I have not used lean touch but i have achieved this with keyboard inputs. You can convert it to lean touch by modifying following script. Just add these line to your ImageTarget's DefaultTrackableEventHandler script:
//Variables for getting capsule and checking if ImageTarget is tracked
private bool isTracked = false;
private GameObject capsule;
Then create an Update method for getting input from user like this.
void Update()
{
if(isTracked)
{
if(Input.GetKey(KeyCode.W))
{
//using forward for moving object in z axis only.
//Also using local position since you need movement to be relative to image target
//Global forward can be very different depending on your World Center Mode
capsule.transform.localPosition += Vector3.forward * Time.deltaTime;
}
else if (Input.GetKey(KeyCode.S))
{
capsule.transform.localPosition -= Vector3.forward * Time.deltaTime;
}
if (Input.GetKey(KeyCode.A))
{
//Using Vector3.left and right to be make sure movement is in X axis.
capsule.transform.localPosition += Vector3.left * Time.deltaTime;
}
else if (Input.GetKey(KeyCode.D))
{
capsule.transform.localPosition += Vector3.right * Time.deltaTime;
}
}
}
As you can see there is no movement in Y axis because i used forward, left and right vectors to make sure movement in in only X and Y axis.
Last you have to make sure isTracked is updated. In order to do that you have to add isTracked = false; in OnTrackingLost method and isTracked = true; in OnTrackingFound method. Good luck!

gameObject rotates when camera rotates

I'm working on a UI menu for a game, and I dragged in a GameObject to serve as a representation of what will be placed down if you select it. When I attach a script for its rotation and run the game, it tilts downward with the tilt of the camera, even though there is no script linking the camera and the object.
Canvas is in ScreenSpace - Camera mode.
Rotation Script:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class BuildList : MonoBehaviour {
//Floats
public float speed = 10f;
void Update ()
{
transform.eulerAngles = new Vector3 (-90f, transform.eulerAngles.y, transform.eulerAngles.z + (speed * Time.deltaTime));
}
}
The x-rotation in the inspector is the one that is rotating. When I rotate the camera downwards, the value the x-rotation in the inspector gets is -155, while the x-rotation of this object should be fixed at -90.

This may or not solve your problem, but I have a tip:
Don't ever use transform.eulerAngles for iterative update. It could cause Gimbal Lock. Use Rotate if possible.
I suggest replace the code with this:
void Update ()
{
// Note: the axis to rotate may different than what you expect. experiment with it
transform.Rotate(Vector3.forward * (speed * Time.deltaTime), Space.World);
}
And set the object rotation at (-90,0,0) before the game begin.

Thanks for willnode pushing me in the right direction, I found code in unity Documentation and modified it so it only rotates the z-axis of the object.
https://docs.unity3d.com/ScriptReference/Transform.Rotate.html
transform.Rotate(0, 0, Time.deltaTime * speed);

Why does my directional light only rotate from 90º to -90º (Unity 5.5)

I have tried both of these C#scripts to rotate my directional light:
using System.Collections;
using UnityEngine;
public class LightRotator : MonoBehaviour
{
void Update ()
{
transform.rotation = Quaternion.Euler(transform.eulerAngles.x + 1.0f,
transform.eulerAngles.y,
transform.eulerAngles.z);
}
}
and
using System.Collections;
using UnityEngine;
public class LightRotator : MonoBehaviour
{
void Update ()
{
transform.localEulerAngles = new Vector3(transform.localEulerAngles.x + 1.0f,
transform.localEulerAngles.y,
transform.localEulerAngles.z);
}
}
They both seem to function exactly the same: If I change transform.eulerAngles.y to transform.eulerAngles.y + 0.5f, the light will rotate along the y-axis, and the same works for the z-axis. However, when I try to do this with the x-axis, it will rotate until it hits 90º, at which point it will continue to attempt rotation but it immediately and continuously shoved back to 90º. If I reverse the direction, it does the same thing at -90º. For example, the rotation might be: 88.5,89.0,89.5,90.0, 90.5, 89.93, 90.24, 89.4, etc.
What is causing this clamping and how do I fix it?

I think this is what you are looking for: http://answers.unity3d.com/questions/187073/rotation-locks-at-90-or-270-degrees.html

In order to fix your problem, you need to use an additional vector, change it inside Update every frame, and then pass it to the eulerAngles propriety of the transform.
Vector3 vect = Vector3.zero;
float rotationSpeed = 10f;
void Start () {
vect = transform.eulerAngles; //Set the vect rotation equal to the game object's one
}
void Update ()
{
vect.x += rotationSpeed * Time.deltaTime;
//Pass unique eulerAngles representation to the object without letting Unity change it
transform.eulerAngles = vect;
}
This happens btw because there're multiple euler angles representation of a single physical rotation in the 3D space, and when you work directly on the eulerAngles propriety of the transform, Unity makes some work behind the scenes, which can lead to a gimbal lock.

Use Quaternions. It's what Unity3d uses internally and doesn't have any of the side effects of euler angles.
using System.Collections;
using UnityEngine;
public class LightRotator : MonoBehaviour
{
public Vector3 RotationAxis = Vector3.right;
Quaternion _startRotation;
float _rotationIncrement = 0;
void Start()
{
_startRotation = transform.rotation;
}
void Update ()
{
Quaternion rotationMod =
Quaternion.AngleAxis(_rotationIncrement, RotationAxis);
_rotationIncrement += 1;
transform.rotation = _startRotation * rotationMod;
}
}
However, you probably want to use something like Quaternion.RotateTowards or Quaternion.Lerp along with Time.time and a rate. You will get much smoother results that way.

if you only want to rotate along the X-axis then set the other axis as 0.

How do I smoothly rotate the camera in unity?

I am making a 2d unity game with C#. Right now, I am trying to make the camera rotate and I am using this code:
rotateX = Random.Range (0, 50);
Camera.main.transform.eulerAngles = Vector3(0,0,rotateX);
But every time I try to run the game, it gives me an error.
Anybody have tips on how I can (smoothly) rotate the camera from side to side?

You can get rid of errors by changing your code to this:
void Update () {
float rotateX = Random.Range (0, 50);
transform.eulerAngles = new Vector3(0,0,rotateX);
}
And attaching script component containing it to the camera. But then it is rotating randomly all the time.
I'm not sure, from the question, what kind rotation do you want. But you can use for example this
void Update () {
transform.Rotate(Vector3.forward, 10.0f * Time.deltaTime);
}
to rotate the camera smoothly. Just change to first parameter to the axis around what you want to rotate.

Don't use Camera.main. Write a class for your camera and then add it to the camera in the scene. Use transform.rotation like this:
void Update ()
{
transform.rotation = Quaternion.Euler(y, x, z);
transform.position = Quaternion.Euler(y, x, z);
}
see this for more info:
http://wiki.unity3d.com/index.php?title=MouseOrbitImproved

The error is because you are missing the new initializer.
rotateX = Random.Range (0, 50);
Camera.main.transform.eulerAngles = new Vector3(0,0,rotateX); //<--- put 'new' before 'Vector3'

Easiest way is to place that code into your gameobject add current camera which you want it to rotate.
public class swipebutton : MonoBehaviour
{
public Camera cam;
void Update()
{
cam.transform.Rotate(Vector3.up, 20.0f * Time.deltaTime);
}
}