Develop Reference

How to make the camera follow the player in unity

Hey i am making a unity game called Cube-Runner. There is a cube and obstacles and you have to go between them. Not going into the game a lot but the problem is how to follow the player. I can't parent it as if i do that while the cube falls the camera will also move with the rotating cube and will make the player(At least myself) dizzy.
Please give me a script
There needs to be a offset Vector3 which i can change from the inspector.
The offset Vector3 may work.
It should be written in C#.
NOTE: I AM NEW TO C# AND UNITY DO NOT JUDGE BY QUESTION

if you dont want to make the player the parent of the camera, then you can do this :
Create a C# script called CameraMovement and attach it to the camera
add this to CameraMovement
using UnityEngine;
class CameraMovement : MonoBehavior
{
public Transform player;
public Vector3 offset;
void Update()
{
//get the players position and add it with offset, then store it to transform.position aka the cameras position
transform.position = player.position + offset;
}
}
click on the camera and look at the inspector, you should see that there is a script called CameraMovement and 2 fields : player and offset. assign player with your player (drag and drop) and offset with the relative position between your camera and the player (where the camera is with the player being the center).
and you're done, play the game and see the results

You could try using the cinemachine tool, it will make you camera follow smoothly to the player. You could check any tutorial on youtube but I recommend you to check the one "Brackeys" did. No code needed for cinemachine

Translate position from 3D camera to 2D camera

Currently I have 2 cameras, one for viewing the 3D objects (Perspective), and the other camera to view 2D objects (Orthographic).
(Also, the view of the camera never intercepts each other.)
I am trying to display a 2D object based on the position of a 3D object, like so:
What I have is the respective 2D and 3D Camera, as well as the Vector3 position of the 3D GameObject.
What I currently have:
public Vector2 Convert3DPositionTo2DPosition(Camera camera3D, Vector3 position3D, Camera camera2D) {
var tempPos = camera3D.WorldToViewportPoint(position3D);
return camera2D.ViewportToWorldPoint(tempPos);
}
The only problem is that the returned position is not completely aligned with the 3D position.
Which results in this kind of results:
Also, I have made sure that both the 3D and 2D object have their pivot point are set correctly in the center, but it still does not work as intended.
(I am currently using Unity 2019.1.14f1)
Edit
TLDR of what I want:
I want a world position that is based on an object in view of the 3D camera which is now in view of the 2D camera and have them look like they are in the same position in the player's point of view (display screen).
What I am going to instantiate in afterwards (using that position) is a non-UI GameObject.
More specifically a particle system.

Check the Viewport Rect settings for both of your Cameras!
if there is any difference between the two cameras you will always get an offset in the positions.
I tested your solution using
public Camera camera3d;
public Camera camera2d;
public Transform obj3d;
public Transform obj2d;
void Update()
{
obj2d.position = camera2d.ViewportToWorldPoint(camera3d.WorldToViewportPoint(obj3d.position));
}
and it just works fine - as long as the Viewport Rect settings match - as you can see here and here.

Camera.main.ScreenToWorldPoint(Input.mousePosition) always returns camera position, doesnt matter where i click

I am trying to create a script that converts mouseclick position into position in GridLayout. I trying to use Camera.main.ScreenToWorldPoint(), but its returning coordinates of camera, not of the point clicked, doesnt metter if i use static camera or camera fixed on player. I attached this script to CharacterRobotBoy prefab from standard unity assets.
using UnityEngine;
public class Position : MonoBehaviour
{
void Update()
{
if (Input.GetMouseButtonUp(0))
{
Vector3 pz = Camera.main.ScreenToWorldPoint(Input.mousePosition);
Debug.Log("camera:"+pz);
pz.z = 0;
GridLayout gridLayout = transform.parent.GetComponentInParent<GridLayout>();
Vector3Int cellPosition = gridLayout.WorldToCell(pz);
Debug.Log("cell position:"+cellPosition);
}
}
}
Can my code be fixed for the task, or is there a different solution for the problem. Thanks for your help.
PS: I am new to unity.

Suppose you have a flat plane and a camera looking at it from above.
Think of the screen as the lens of the camera, and the cursor as a small ant walking over it. If I remember correctly, ScreenToWorldPoint returns the location of the ant in world-space, which is somewhere in the sky. By setting z := 0, you get a point directly below the camera, regardless of where the cursor is.
What you should do instead is cast a ray from the center of the camera-view through the ant, and collide it with the plane. The collision point is what you are looking for.
It can be done via the ScreenPointToRay method.
You should check out Brackeys RPG tutorial, he's done something similar.
Hope it helps :)

Rotating 2D world within Unity

I am looking at developing a game within Unity by using C#
The game will take the gyroscope orientation and rotate accordingly to the direction of which the phone is rotated.
I am curious of how this would work, I understand how I would be able to read and update the gyroscope orientation however I am unsure on how to assign this to a world to rotate. There will be a player on world which will be the next challenge to prevent the player clipping through the world when it is rotated.
Hence the world should rotate around the players current location.
I currently have no code as I am in the process of designing this, however i am unable to get the logic of how to make this work within my head
Thankyou

If I get your objective right, I guess rotating the camera like in a Fist-Person game should be enough, and would be way simpler than rotating the whole world while keeping the player static.

This is how I would go about it, first I wouldn't rotate the world, as that is alot of objects to rotate, but if you really wanted to you could parent all of the world to a single game object, then rotate that object about an axis based off of the players position(See this: https://docs.unity3d.com/ScriptReference/Transform.RotateAround.html).
The simplest way is to attach your main camera to your player(Drag and drop it on your Player Object in your hierchy), then rotate your player.
for an example you can test on your machine without the gyroscrope:
using UnityEngine;
public class rotatorScript: MonoBehaviour {
void Update() {
// Will Rotate based off of left/right arrows
float rotator = -Input.GetAxisRaw("Horizontal");
// Move up or down based off of up/down Arrows
float verticalDirection = Input.GetAxisRaw("Vertical");
// Do the actual movement... using space.self so it is based on the player not the world.
transform.Translate(Vector3.up * verticalDirection * Time.deltaTime * 5f, Space.self);
transform.Rotate(0f,0f,90f * Time.deltaTime * rotator);
}
}
This script would be attached to the player.

Positioning a gun at a constant place

I am trying to position my gun the way most fps games position it,
for example like this:
But I'm having a problem when I try to position and rotate it with the player. The gun doesn't rotate well and doesn't have the same position always.
Is there a way to keep a gun in the same position and make it rotate well with the player?
But my main problem is the position of the gun i need it to stay in one place like in every fps, when i start the game and pick a gun it spawn in diffrent location on the screen Because of the rotation.
Here's is the code that I am trying to use:
GameObject temp = GameObject.Find(gameObject.name);
playerGuns[keyPress] = Instantiate(temp, Player.transform.position
+ new Vector3(-2f, 3f, 4f), Quaternion.identity) as GameObject;
playerGuns[keyPress].name = gameObject.name;
playerGuns[keyPress].tag = gameObject.tag;
playerGuns[keyPress].transform.parent = Player.transform;
playerGuns[keyPress].transform.rotation.SetLookRotation(Player.transform.position);

Alright here is the answer I promised:
First issue was with how you were setting your rotation, SetLookRotation takes in 2 parameters, Vector3 view, and Vector3 up the second is defaulted to Vector3.up. You were passing in the player.transform.position, for the "view" which is the direction you want transform to look in. Think of it like this, if I am far east facing west, my weapon will face east... (That is assuming the SetLookRotation normalizes it.) this is because my actual position is east, from some arbitrary origin. Something you could have used would have been player.transform.forward.
To spawn an object and have it have the same relative rotation and and position you can use Instantiate like you have in your original code. There are Several versions of instantiate.
In the comments I said to give yourself an offsetPosition and a eulerAngle, but this can be quite troublesome if you have multiple weapons. I mentioned I would give a recommendation for how I would set this up for multiple weapons... So here yea go.
Scriptable Objects,
In Unity you can create this objects to store information about a particular object, so for example a "Weapon" object can look like this:
using UnityEngine;
using System.Collections;
[CreateAssetMenu(fileName = "New Weapon", menuName = "Weapon")]
public class WeaponObject : ScriptableObject {
public string objectName = "New Weapon";
public Vector3 offSetPosition;
public Vector3 startOffsetRotation;
public float fireRate;
// Using a gameObject to store the weapon model so you can technical
// store the firing point.
public GameObject weaponModel;
}
You can create a new object now by right-clicking in your asset directory and going to create->weapon. Once you have done this you can rename the object it made, and the inspector will show all the public fields for this object you can modify.
With this you can create multiple weapons, and store their data in like a WeaponManager, that spawns every weapon. with something like:
WeaponObject weapon = WeaponManager.getWeapon(keyPress);
playerGuns[keyPress] = Instantiate(weapon.weaponModel, Player.transform.position + weapon.offsetPosition, Quaternion.identity) as GameObject;
playerGuns[keyPress].name = weapon.objectName;
playerGuns[keyPress].transform.parent = Player.transform;
playerGuns[keyPress].transform.eulerAngles = weapon.startOffsetRotation;
if(player.weaponScript != null) {
// we can have a single script for all of our weapons, and the WeaponObject
// will control its firerate, which projectiles it fires, etc.
player.weaponScript.setWeapon(weapon);
}

playerGuns[keyPress].transform.parent = Player.transform;
This line might be causing a problem. If you are parenting your gun to the players transform then it will follow the player. But it sounds like you want it to follow the camera?
try:
playerGuns[keyPress].transform.parent = Camera.main.transform;

Here is a useful answer provided by reddit user Mathias9807:
Many games will clear the depth buffer before drawing the gun model.
This will prevent the gun model from clipping through geometry but it
can look a bit weird when standing near a wall:
If you just want to render an object sticking to the camera you should
just get rid of the view matrix (Assuming you're using model-, view-
and projection matrices).
Explanation: Normally when you are using a view matrix (the camera matrix),the objects in the scene are being translated relative to the magnitude of the cameras position vector, and rotating by its yaw and pitch, which gives the illusion of a camera moving in a 3D space, but really there is no camera, just the objects in the scene that scale, and translate in in relation to the values defined for the camera.
So, when you remove that camera matrix for an object, the cameras position now has no influence on the models position, or put another way, the model does not move relative to the camera anymore but moves congruently with the camera.