Hope my title summarises my problem. I have a rocket on a 2d game that only moves horizontally across the screen. I want it to rotate towards the players finger (the direction of movement), but cannot find a way to rotate the object without rotating the whole axis it moves on. I simply need it to seem like it has turned, but it should keep moving along the x. How can I go about this?
void Start () {
//scoreT = GetComponent<TextMeshProUGUI> ();
gameSpeed = 1;
score = 0;
Rigidbody2D rb2d = GetComponent<Rigidbody2D> ();
}
// Update is called once per frame
void Update () {
float MoveHorizontal = Input.GetAxis ("Horizontal");
Vector2 Movement = new Vector2 (MoveHorizontal, 0.0f);
rb2d.rotation = Quaternion.Euler (0.0f, 0, 0f, rb2d.velocity.x * -tilt);
transform.Translate (MoveHorizontal * speed, 0, 0);
One thing you can do is to modify rigidbody.rotation of your rocket rocket to make it tilt, when it moves, to one direction or to another. For example:
float tilt - 0.3f;
//In case you prefer the rotation in another axis you just need to modify the position of the rigidbody.velocity.x * -tilt
rigidbody.rotation = Quaternion.Euler (0.0f, 0.0f, rigidbody.velocity.x * -tilt);
Since you didn't add any code I am not sure how you are moving your rocket, so I will post a generic code you will need to adapt depending on your own project:
public class PlayerController : MonoBehaviour
{
public float speed;
//The tild factor
public float tilt;
//The limit within the spaceship can move
public Boundary boundary;
void FixedUpdate ()
{
//You will need to capture the screen touchs of the user for the inputs
float moveHorizontal = Input.GetAxis ("Horizontal");
float moveVertical = Input.GetAxis ("Vertical");
//Applying the movement to the GameObject
Vector3 movement = new Vector3 (moveHorizontal, 0.0f, moveVertical);
rigidbody.velocity = movement * speed;
//To ensure the GameObject doesnt move outside of the game boundary
rigidbody.position = new Vector3
(
Mathf.Clamp (rigidbody.position.x, boundary.xMin, boundary.xMax),
0.0f,
Mathf.Clamp (rigidbody.position.z, boundary.zMin, boundary.zMax)
);
//Here is where you apply the rotation
rigidbody.rotation = Quaternion.Euler (0.0f, 0.0f, rigidbody.velocity.x * -tilt);
}
}
As an aside, you are doing a space 2D game you may be interested in checking this tutorial:
https://unity3d.com/learn/tutorials/s/space-shooter-tutorial
What you want is to move your object in global/world space. As it seems the movement of your rocket is currently happening within local space. So when you rotate the rocket it's local coordinates are rotated as well. The world space coordinates are fixed and will never rotate when you change your rocket.
Here is another explanation at that.
You can also have a look at Transform.localPosition and Transform.position and see how your rocket behaves when using one or the other.
You could make the sprite/renderer a child of the GameObject that is your rocket.
Then you can freely rotate the sprite/renderer around without changing the rotation you move the parent GameObject.
This is a hacky solution but it achieves the desired result.
You must move your object relative to the world and rotate locally.
So use Transform.position to move your object and Transform.LocalRotation to rotate it.
Or you can put the part that must rotate as a children of the object that translate, and rotate the children.
Related
I have a virtual movement joystick that I'm using to control the movement of a player object which works fine, the code for this is below.
The problem I have is when I rotate the camera within game mode (or device) the direction is not adjusted according to the cameras rotation, exactly like is shown in this post here that I looked through to try and understand the problem.
I realise I need to rotate my movement around the forward direction the camera is facing which I tried to do with the bottom snippet of code however this yields really strange behavior when the player object moves incredibly fast and eventually unity becomes unresponsive, so something is being incorrectly multiplied I guess.
Could anybody point out where I'm going wrong please? ta !
Edit - Modified to potential answer
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using EasyJoystick;
public class NewJoystick : MonoBehaviour
{
[SerializeField] private float speed;
[SerializeField] private Joystick1 joystick;
[SerializeField] Camera MainCam;
private Rigidbody RB;
private Transform cameraTransform;
// Start is called before the first frame update
void Start()
{
cameraTransform = MainCam.transform;
}
void Awake()
{
RB = gameObject.GetComponent<Rigidbody>();
}
// Update is called once per frame
void Update()
{
float xMovement = joystick.Horizontal();
float zMovement = joystick.Vertical();
Vector3 inputDirection = new Vector3(xMovement, 0, zMovement);
//Get the camera horizontal rotation
Vector3 faceDirection = new Vector3(cameraTransform.forward.x, 0, cameraTransform.forward.z);
//Get the angle between world forward and camera
float cameraAngle = Vector3.SignedAngle(Vector3.forward, faceDirection, Vector3.up);
//Finally rotate the input direction horizontally by the cameraAngle
Vector3 moveDirection = Quaternion.Euler(0, cameraAngle, 0) * inputDirection;
RB.velocity = moveDirection * speed;
}
}
I tried this in the update loop -
var Direction = transform.position += new Vector3(xMovement, 0f,zMovement); //* speed * Time.deltaTime;
Vector3 newDir = MainCam.transform.TransformDirection(Direction);
transform.position += new Vector3(newDir.x, 0f,newDir.z) * speed * Time.deltaTime;
Well, here is a simple idea for how to solve it. At least this is how I did it, and it seems to work ever since.
First, you need to get the joystick input, like you did. Both axis input value should be between -1 and 1. This actually determines the direction itself, since the horizontal axis gives you the X coordinate of a vector and the vertical gives you the Y coordinate of that vector. You can visualize it easily:
Mind, that I just put up some random values there, but you get the idea.
Now, your problem is, that this angle you get from your raw input is
static in direction, meaning that it doesn't rely on the camera's face
direction. You can solve this problem by "locking it to the camera",
or in other words, rotate the input direction based on the camera
rotation. Here's a quick example:
//Get the input direction
float inputX = joystick.Horizontal();
float inputY = joystick.Vertical();
Vector3 inputDirection = new Vector3(inputX, 0, inputY);
//Get the camera horizontal rotation
Vector3 faceDirection = new Vector3(cameraTransform.forward.x, 0, cameraTransform.forward.z);
//Get the angle between world forward and camera
float cameraAngle = Vector3.SignedAngle(Vector3.forward, faceDirection, Vector3.up);
//Finally rotate the input direction horizontally by the cameraAngle
Vector3 moveDirection = Quaternion.Euler(0, cameraAngle, 0) * inputDirection;
IMPORTANT: The code above should be called in the Update cycle, since that is where you get the input information.
After this, you can work with moveDirection to move your player. (I suggest using physics for moving, instead of modifying its position)
Simple moving example:
public RigidBody rigidbody;
public Vector3 moveDirection;
public float moveSpeed = 5f;
void FixedUpdate()
{
rigidbody.velocity = moveDirection * moveSpeed;
}
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);
}
I'm building a top down shooter and so I have my camera above my player and the map. Here's the code I've written in the player controller script for movement:
public class playerMovement : MonoBehaviour {
public float speed;
private Camera mainCamera;
void Start () {
mainCamera = FindObjectOfType<Camera>();
}
// Update is called once per frame
void Update () {
// player movement
transform.Translate(speed * Input.GetAxis("Horizontal") * Time.deltaTime, 0f, speed * Input.GetAxis("Vertical") * Time.deltaTime);
// Camera Ray casting
Ray cameraRay = mainCamera.ScreenPointToRay(Input.mousePosition);
Plane groundPlane = new Plane(Vector3.up, Vector3.zero);
float rayLength;
if (groundPlane.Raycast(cameraRay, out rayLength)) {
Vector3 look = cameraRay.GetPoint(rayLength);
Debug.DrawLine(cameraRay.origin, look, Color.red);
transform.LookAt(new Vector3(look.x, transform.position.y, look.z));
}
}
}
I want to be able to move the player using the WASD keys and also rotate following the direction on where the mouse is, however I don't want the rotation of the player to change the direction of the keys, I need the player to move forwards if the W key is pressed no matter which way the player is facing.
However for some reason my code makes the player move forwards depending on which way it is facing which I don't want.
How can I fix this?
The problem is that your transform.Translate call is in "self" space. Forward, backward, left, right are all relative to the direction the transform is facing. That is why your player is moving relative to the facing direction.
If you want to translate relative to "global" or "world" space, you have to add an additional parameter.
// player movement
transform.Translate(speed * Input.GetAxis("Horizontal") * Time.deltaTime,
0f,
speed * Input.GetAxis("Vertical") * Time.deltaTime,
Space.World);
Note the Space.World parameter at the end, to set the world coordinate system.
You can find more in the Unity docs here: https://docs.unity3d.com/ScriptReference/Transform.Translate.html
You need to look at the difference between local and global coordinate systems.
Right now your WASD keys are moving the player character according to global coordinates, and you want the WASD movement to be dependant on the player's orientation so you need to use a local coordinate system.
http://wiki.unity3d.com/index.php?title=Converting_Between_Coordinate_Systems
I'm doing a game in Unity, it is a space shooter and I had made a script for moving my spaceship. This game is developed for Android devices, and I'm moving the ship with the Touch. It is something like dragging the ship, to the position you want. Also one must note, that I'm not considering if you touch in the center of the ship in order to drag it.
However I'm having problems, depending on the device where I'm working, the ship is not following correctly the drag, for instance if I'm on a tablet, if I move with the finger, let's say 3 inches, my ship is only moving one. However, on my mobile device it is working fine.
What I'm doing wrong? I attach you the code for the movement:
void MovePlayer (Vector3 movement)
{
GetComponent<Rigidbody> ().velocity = movement;
GetComponent<Rigidbody> ().position = new Vector3
(Mathf.Clamp (GetComponent<Rigidbody> ().position.x, boundary.xMin, boundary.xMax),
0.0f,
Mathf.Clamp (GetComponent<Rigidbody> ().position.z, boundary.zMin, boundary.zMax));
GetComponent<Rigidbody> ().rotation = Quaternion.Euler
(0.0f,
0.0f,
GetComponent<Rigidbody> ().velocity.x * -tilt);
}
void FixedUpdate ()
{
if (Input.touchCount > 0 && Input.GetTouch (0).phase == TouchPhase.Moved) {
// Get movement of the finger since last frame
Vector2 touchDeltaPosition = Input.GetTouch (0).deltaPosition;
float moveHorizontal = touchDeltaPosition.x;
float moveVertical = touchDeltaPosition.y;
Vector3 movement = new Vector3 (moveHorizontal, 0.0f, moveVertical) * speedMouse;
MovePlayer (movement);
}
}
Lot of thanks in advance and best regards
Touch position and deltaPosition are in pixels, so you can't assume that results will be consistent across varying resolutions.
There are a few ways you can mitigate that, depending on your design needs...
You could express the touch deltaPosition as a fraction of the screen resolution:
float screenSize = Mathf.Max(Screen.width, Screen.height);
Vector2 touchDeltaPosition = Input.GetTouch(0).deltaPosition;
Vector2 touchDeltaPercentage = touchDeltaPosition / screenSize;
//touchDeltaPercentage values will now range from 0 to 1
//you can use that as you see fit
You could use the main camera to transform screen coordinates into world positions, then check the difference between those:
Vector2 touchDeltaPosition = Input.GetTouch(0).deltaPosition;
Vector3 screenCenter = new Vector3(Screen.width * 0.5f, Screen.height * 0.5f, 1f);
Vector3 screenTouch = screenCenter + new Vector3(touchDeltaPosition.x, touchDeltaPosition.y, 0f);
Vector3 worldCenterPosition = Camera.main.ScreenToWorldPoint(screenCenter);
Vector3 worldTouchPosition = Camera.main.ScreenToWorldPoint(screenTouch);
Vector3 worldDeltaPosition = worldTouchPosition - worldCenterPosition;
//worldDeltaPosition now expresses the touchDelta in world-space units
//you can use that as you see fit
The point, with either method, is that you want some units that aren't tied to screen resolution.
Similar to the above, you could also use the main camera to raycast against terrain, or a large plane, or some other collider(s) in the scene.
The problem here is you are using a speedMouse variable. Speed should have absolutely nothing to do with this, and would be the exact reason for your problem. You should be moving objects based solely on position of touch/mouse. not with speed. because speed is the only thing that will differ your output from cross resolutions.
Think about it this way, if your speed is 10 pixels/second you will move a lot slower on a denser screen, however if you are only updating position based on location on the screen, speeds will never differ.
I have a board on the world X,Z axis.
I have a camera that can rotate to look downward or upward and rotate left to right using the world Y axis.
Here's the camera rotation code:
float angle = (mouseX_Current - mouseX_ActionStart) * camRotationSpeedMod;
Camera.main.transform.Rotate(0.0f, angle, 0.0f, Space.World);
angle = (mouseY_Current - mouseY_ActionStart) * camRotationSpeedMod;
Camera.main.transform.Rotate(angle, 0.0f, 0.0f, Space.Self);
Using mouse button down and a mouse position input(drag&Drop) I translate the camera in the world. It receive a 2D vector that contain the X and Y value of the mouse(drag&drop) operation. Here's the code of the method I use :
private void CameraOnPlaneTranslation(Vector2 myVector)
{
float cameraYPos = Camera.main.transform.position.y;
Camera.main.transform.Translate(new Vector3(myVector[0], 0.0f, myVector[1]));
Camera.main.transform.position = new Vector3(Camera.main.transform.position.x, cameraYPos, Camera.main.transform.position.z);
}
Problem : When my camera is not oriented directly toward the Z Axis(0.0f, Z, 0.0f) the translation vector I compute is incorrect. I need to change the Y value of the vector so the camera don't move on the world Y axis.
Thanks
I am not familiar with Unity, but supposing it is similar to other 3D systems on these points, I will attempt an answer and hopefully not embarrass myself.
It looks like you /translate/ the camera position, then immediately /set/ the camera position, thus overwriting the work done by translate. If this is the case, you should try setting camera.main.transform.position once (in the line after you create the Camera). Then only apply myVector by the Translate call (as you have it). Thus you should eliminate the third line of the method Camera.main.transform.position = new Vector3(Camera.main.transform.position.x, cameraYPos, Camera.main.transform.position.z);
After trying this, if it still does not do what you expect, see if it needs you to Update the view or Flush or ApplyTransform . . . anything that will make it understand you are done altering the transform and you are ready for it to process again with the updated transform.
I've solved this by adding another GameObject that is affected only by the camera right/left rotations(world up vector) and the camera translations.
In the Awake method
cameraOrientation = new GameObject("cameraOrientation");
cameraOrientation.transform.position = Camera.main.transform.position;
cameraOrientation.transform.localEulerAngles = new Vector3(0.0f, Camera.main.transform.localEulerAngles.y, 0.0f);
In the rotation method
float angle = (mouseX_Current - mouseX_ActionStart) * camRotationSpeedMod;
Camera.main.transform.Rotate(0.0f, angle, 0.0f, Space.World);
cameraOrientation.transform.Rotate(0.0f, angle, 0.0f, Space.World);
angle = (mouseY_Current - mouseY_ActionStart) * camRotationSpeedMod;
Camera.main.transform.Rotate(angle, 0.0f, 0.0f, Space.Self);
And finally the translation method
cameraOrientation.transform.Translate(new Vector3(myVector[0], 0.0f, myVector[1]));
Camera.main.transform.position = cameraOrientation.transform.position;