This was probably asked a dozen of times, but I can't seem to find the answer anywhere.
I have a dedicated server for a space game written in C# console application. The problems that I'm facing is the synchronisation of GameObject rotations. I'm suspecting the issue being related to gimbal lock, but I am not sure.
Here I have my player movement/rotation controller:
public class PlayerMovement : MonoBehaviour {
[SerializeField] float maxSpeed = 40f;
[SerializeField] float shipRotationSpeed = 60f;
Transform characterTransform;
void Awake()
{
characterTransform = transform;
}
void Update()
{
Turn();
Thrust();
}
float Speed() {
return maxSpeed;
}
void Turn() {
float rotX = shipRotationSpeed * Time.deltaTime * CrossPlatformInputManager.GetAxis("Vertical");
float rotY = shipRotationSpeed * Time.deltaTime * CrossPlatformInputManager.GetAxis("Horizontal");
characterTransform.Rotate(-rotX, rotY, 0);
}
void Thrust() {
if (CrossPlatformInputManager.GetAxis("Move") > 0) {
characterTransform.position += shipTransform.forward * Speed() * Time.deltaTime * CrossPlatformInputManager.GetAxis("Move");
}
}
}
This script is applied to my character object which is a ship. Note that the character object has a child object which is the ship itself and has fixed rotation and position that do not change. When character has moved/rotated I send the following to the server: position(x, y, z) and rotation(x, y, z, w).
Now here is the actual script that receives network packet information and updates the other players in game:
public class CharacterObject : MonoBehaviour {
[SerializeField] GameObject shipModel;
public int guid;
public int characterId;
public string name;
public int shipId;
Vector3 realPosition;
Quaternion realRotation;
public void Awake() {
}
public int Guid { get { return guid; } }
public int CharacterId { get { return characterId; } }
void Start () {
realPosition = transform.position;
realRotation = transform.rotation;
}
void Update () {
// Do nothing
}
internal void LoadCharacter(SNCharacterUpdatePacket cuPacket) {
guid = cuPacket.CharacterGuid;
characterId = cuPacket.CharacterId;
name = cuPacket.CharacterName;
shipId = cuPacket.ShipId;
realPosition = new Vector3(cuPacket.ShipPosX, cuPacket.ShipPosY, cuPacket.ShipPosZ);
realRotation = new Quaternion(cuPacket.ShipRotX, cuPacket.ShipRotY, cuPacket.ShipRotZ, cuPacket.ShipRotW);
UpdateTransform();
Instantiate(Resources.Load("Ships/Ship1/Ship1"), shipModel.transform);
}
internal void UpdateCharacter(SNCharacterUpdatePacket cuPacket) {
realPosition = new Vector3(cuPacket.ShipPosX, cuPacket.ShipPosY, cuPacket.ShipPosZ);
realRotation = new Quaternion(cuPacket.ShipRotX, cuPacket.ShipRotY, cuPacket.ShipRotZ, cuPacket.ShipRotW);
UpdateTransform();
}
void UpdateTransform() {
transform.position = Vector3.Lerp(transform.position, realPosition, 0.1f);
transform.rotation = Quaternion.Lerp(transform.rotation, realRotation, 0.5f);
}
}
Do you see anything wrong with the code ?
My experience with 2 players in game is the following:
When I start the game with two players they spawn at the same location (0,0,0) and same rotation (0,0,0).
Lets say that The other player is rotating continuously around the X-axis only. What I am experiencing is:
First 90 deg. of rotation it renders fine.
Next 180 deg. of rotation the object stays in place
The last 90 deg. of rotation renders fine
In the first version I did not send the 'w' value of Quaternion, but then added it in the second version and it did not help. Note that there is no restrictions in rotation and users can rotate endlessly in all directions.
Btw the positioning works fine.
I might not understand Quaternions fully, but I thought that they had a purpose in avoiding the gimbal lock issue.
Any help would be appreciated.
To answer my own question. I used transform.localEulerAngles instead of transform.rotation, and everything seems to work just fine.
Now the only thing that I am unsure is if gimbal lock could happen with this change.
Related
I am new to unity and don't know a lot of stuff. I've been watching tutorials and I saw one in which the guy created a replica of famous 'Chilly Snow'. The game is complete but the movement of ball isn't like the one in chilly snow. The ball starts orbiting continuously when I press mouse button. I wanted to know how to create that kind of movement, so that the ball turns left and right in a curve but doesn't go in to an orbit. I googled a lot but wasn't able to find my required result. I would really appreciate if anyone could point me in the right direction. Images are attached.Chilly Snow | Movement of my ball
public class movement : MonoBehaviour {
private float points;
public float playerSpeed;
private float rotationSpeed;
public Text score;
private bool isMovingLeft;
public GameObject player;
public bool isDead;
void Start () {
Time.timeScale = 0;
isDead = false;
isMovingLeft = true;
points = 0;
}
void Update ()
{
if (isDead == false)
{
points += Time.deltaTime;
}
transform.Translate (Vector3.down * playerSpeed * Time.deltaTime);
if (Input.GetMouseButtonDown (0))
{
Time.timeScale = 1;
isMovingLeft = !isMovingLeft;
rotationSpeed += 0.5f * Time.deltaTime;
}
if (Input.GetMouseButton (0))
{
rotationSpeed = 1f;
}
if (isMovingLeft) {
rotationSpeed += 1.5f * Time.deltaTime;
transform.Rotate(0,0,rotationSpeed);
} else
transform.Rotate(0,0, - rotationSpeed);
}
void OnTriggerEnter2D(Collider2D other)
{
if (other.tag == "Obstacle") {
Die ();
}
}
public void Die()
{
playerSpeed = 0f;
isDead = true;
Invoke ("Restart", 2f);
}
void Restart(){
SceneManager.LoadScene ("Ski_scene_1");
}
void FixedUpdate()
{
score.GetComponent<Text>().text = points.ToString("0");
}
}
Here is how I would approach it without doing a rotation... using your code.
public class movement : MonoBehaviour {
private float points;
public Text score;
public GameObject player;
public bool isDead;
private float currentXSpeed;
private float targetSpeed;
public float maxXSpeed;
public float speedChange;
void Start () {
Time.timeScale = 0;
isDead = false;
isMovingLeft = true;
points = 0;
targetSpeed = maxXSpeed;
}
void Update ()
{
if (isDead == false)
{
points += Time.deltaTime;
}
if(Input.GetMouseButtonDown(0))
{
Time.timeScale = 1;
targetSpeed = -targetSpeed;
}
currentSpeed = mathf.MoveTowards(currentSpeed, targetSpeed, speedChange * Time.deltaTime);
Vector3 movementDirection = new Vector3(currentSpeed, Vector3.down.y * playerSpeed, 0.0f);
transform.Translate (movementDirection * Time.deltaTime);
}
void OnTriggerEnter2D(Collider2D other)
{
if (other.tag == "Obstacle") {
Die ();
}
}
public void Die()
{
playerSpeed = 0f;
isDead = true;
Invoke ("Restart", 2f);
}
void Restart(){
SceneManager.LoadScene ("Ski_scene_1");
}
void FixedUpdate()
{
score.GetComponent<Text>().text = points.ToString("0");
}
}
You need something like sinusoidal movement or any other graph you fancy.
An example would be for this is like;
gameObject.transform.Translate(Vector3.right * Time.deltaTime*cubeSpeed);
gameObject.transform.position += transform.up * Mathf.Sin (Time.fixedTime * 3.0f ) * 0.1f;
Above pseudo is for 2D graph simulation, can be adapted to your situation.
The object is always moving to right and going up and down while making a sinusoidal movement. Because the up and down speed is not fixed hence you get the sinusoidal or like sinusoidal movement.
In your case, while the object is always going down it will make the sinusoidal movement to left and right.
Your movement is based on the rotation so, if you give this sinusoidal speed as your rotation speed, you can achieve this.
Another aproach can be lerp or slerp
Lerp allows you to make kinda smooth transactions between 2 vectors.
Like moving from pointA to pointB in X seconds.
For rotation you will need Quaternion.Lerp There is a great answer on Unity Answers you can check that if you haven't before.
Hope this helps! Cheers!
I just started learning Unity. I tried to make a simple box move by using this script. The premise is, whenever someone presses 'w' the box moves forward.
public class PlayerMover : MonoBehaviour {
public float speed;
private Rigidbody rb;
public void Start () {
rb = GetComponent<Rigidbody>();
}
public void Update () {
bool w = Input.GetButton("w");
if (w) {
Vector3 move = new Vector3(0, 0, 1) * speed;
rb.MovePosition(move);
Debug.Log("Moved using w key");
}
}
}
Whenever I use this, the box doesn't move forward on a 'w' keypress. What is wrong with my code? I thought it might be the way I have my Vector 3 move set up so I tried replacing the z-axis with speed, but that didn't work. Could someone tell me where I am messing up?
You move Rigidbody with Rigidbody.MovePosition and rotate it with Rigidbody.MoveRotation if you want it to properly collide with Objects around it. Rigidbody should not be moved by their position, rotation or the Translate variables/function.
The "w" is not predefined like SherinBinu mentioned but that's not the only problem. If you define it and use KeyCode.W it still won't work. The object will move once and stop.
Change
Vector3 move = new Vector3(0, 0, 1) * speed;
rb.MovePosition(move);
to
tempVect = tempVect.normalized * speed * Time.deltaTime;
rb.MovePosition(transform.position + tempVect);
This should do it:
public float speed;
private Rigidbody rb;
public void Start()
{
rb = GetComponent<Rigidbody>();
}
public void Update()
{
bool w = Input.GetKey(KeyCode.W);
if (w)
{
Vector3 tempVect = new Vector3(0, 0, 1);
tempVect = tempVect.normalized * speed * Time.deltaTime;
rb.MovePosition(transform.position + tempVect);
}
}
Finally, I think you want to move your object with wasd key. If that's the case then use Input.GetAxisRaw or Input.GetAxis.
public void Update()
{
float h = Input.GetAxisRaw("Horizontal");
float v = Input.GetAxisRaw("Vertical");
Vector3 tempVect = new Vector3(h, 0, v);
tempVect = tempVect.normalized * speed * Time.deltaTime;
rb.MovePosition(transform.position + tempVect);
}
"w" is not predefined unless you explicitly define it. Use KeyCode.W
Try this:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class PlayerMover : MonoBehaviour {
public float speed;
private Rigidbody rb;
void Start () {
rb = GetComponent<Rigidbody>();
}
void Update () {
bool w = Input.GetKey(KeyCode.W);
if (w) {
Vector3 move = new Vector3(0, 0, 1) * speed *Time.deltaTime;
rb.MovePosition(move);
Debug.Log("Moved using w key");
}
}
}
Use Input.GetKey(KeyCode.W) for getting input.
EDIT NOTE:
To move the object relative to its initial position use rb.MovePosition(transform.position+move) rather than rb.MovePosition(move)
Instead of making w a bool, you can use axis, also, in unity editor you should make it so the rigidbody movement is frozen
here is some code
void update()
{
rb.AddForce(Input.GetAxis("Horizontal"));
}
bool w = Input.GetKeyDown(KeyCode.W);
Keeping my Photon project under given 500 msg/s is really tricky. Even with 10 players in room each updating position 10 times per second 10(players) * 10(sent msg) * 10(received msg) = 1000 msg/s is generated. That is just the player movement. Next I need to move bullets around which will increase the amount of messages once more.
At the moment I have bullets instantiated across network but only local player is able to move it since I don't yet sync movement of bullets. I was wondering could I have all of the clients start moving the bullets on their local device once it's instantiated instead of passing position through network? This would save a lot of messages since I would never have to send bullet positions over network.
Hacking and cheating is not a problem in my game.
EDIT: this is the script I'm using at the moment to move bullets. This only works locally on the device that bullet was instantiated on. How would I run this script locally on each client?
public class Network_Bullet : Photon.MonoBehaviour {
private Rigidbody2D rb;
[HideInInspector]
public float speed = 0;
[HideInInspector]
public Vector2 direction = Vector2.zero;
public void SetValues(float _speed, Vector2 _direction)
{
rb = GetComponent<Rigidbody2D> ();
this.speed = _speed + 150f; // bullet has 150 more speed than player
this.direction = _direction;
}
private void Update()
{
if (speed != 0)
{
rb.velocity = direction * speed * Time.fixedDeltaTime;
}
}
}
And here is how to bullet is instantiated:
private void OnClick_Shoot()
{
if (photonView.isMine == true)
{
if (timeSinceLastBullet >= spawnTime)
{
GameObject newBullet = PhotonNetwork.Instantiate (Path.Combine ("prefabs", "Network Bullet"), transform.position, transform.rotation, 0);
newBullet.GetComponent<Network_Bullet> ().SetValues (owner.speed, new Vector2(owner.last_horizontal, owner.last_vertical));
timeSinceLastBullet = 0f;
}
else
{
Debug.Log ("loading...");
}
}
}
First, 10 players with 10 movement messages per second generates 100 messages per second per room.
To the actual question - for bullets, all you need to do is instantiate and give it initial rotation and speed. Because bullets usually don't change their rotation or speed (at least in video games), you only need to do that and only update the bullets in everyone's local machines.
You can try this:
private void OnClick_Shoot()
{
if (timeSinceLastBullet >= spawnTime)
{
int level = 2; //it is not need for you, but you can setup some params on object
// for example i set level for increase damage per level.
string someMsg = "hi i'm bullet";
object[] parametres = new object[] {
level,
someMsg
}
PhotonNetwork.Instantiate (Path.Combine ("prefabs", "Network Bullet"), transform.position, transform.rotation, 0, parametres );
timeSinceLastBullet = 0f;
}
else
{
Debug.Log ("loading...");
}
}
And bullet, just add PhotonView component on your prefab and it will be work
public class Bullet : MonoBehaviour {
private Rigidbody2D rb;
[HideInInspector]
public float speed = 0;
[HideInInspector]
public Vector3 direction = Vector3.zero;
void Start()
{
rb = GetComponent<Rigidbody2D> ();
this.speed = _speed + 150f; // bullet has 150 more speed than player
this.direction = _direction;
PhotonView pView = gameObject.GetPhotonView();
// or
//PhotonView pView = gameObject.GetComponent<PhotonView>();
damage = 10 * pView[0]; // increase damage per level
Debug.Log(pView[1]);
}
void Update()
{
if (speed != 0)
{
rb.velocity = direction * speed * Time.fixedDeltaTime;
}
}
}
So, that methods will be work localy on all clients. I'm using that on my bullets.
I've created a movement script that checks to see if an object is grounded, and if so, moves the object based on user input. When I attach it to an object I create in Unity, it works. When I attach it to an object I created in Blender and then imported, nothing. No errors, the object just fails to respond. I can't figure out what is causing the imported object to not respond to input. Both objects have a rigidbody and a collider.
This is the code for movement:
using UnityEngine;
using System.Collections;
public class PlayerMovement : MonoBehaviour {
public float speed = 10f;
public float rotationSpeed = 100f;
private float distToGround;
private Collider collider;
void Start() {
collider = GetComponent<Collider>();
distToGround = collider.bounds.extents.y;
}
void Update() {
MovePlayer();
}
void MovePlayer() {
float translation = Input.GetAxis("Vertical");
float rotation = Input.GetAxis("Horizontal");
if (translation != null && rotation != null) {
if (IsGrounded()) {
transform.Translate(0, 0, translation * speed * Time.deltaTime);
transform.Rotate(0, rotation * rotationSpeed * Time.deltaTime, 0);
}
}
}
bool IsGrounded() {
return Physics.Raycast(transform.position, -Vector3.up, distToGround + 0.1f);
}
}
I've made a video demonstrating this: https://www.youtube.com/watch?v=qatBF5Ov3Zo&feature=youtu.be
This is a complication caused by Blender left handed axis vs Unity's right handed axis. When I exported a rotated object from Blender, the script works on the object as expected. The solution is to make sure that the object you are exporting is facing the Z axis instead of the native Y axis.
I am attempting to follow a few unity3d exmaples on c# scripting for tower defense style games. I need a turret to 'aim' at another gameobject. The examples I find do not seem to account for a origin that is not at 0,0,0. Meaning, when the turret is in a different location, it aims based on a starting point, not its current location.
how it is behaving now:
http://screencast.com/t/Vx35LJXRKNUm
In the script I am using, how do I give Quaternion.LookRotation information about the current location of the turret for it to include in it's calculation? script, function CalculateAimPosition, line59 :
using UnityEngine;
using System.Collections;
public class TurretBehavior : MonoBehaviour {
public GameObject projectile;
public GameObject muzzleEffect;
public float reloadTime = 1f;
public float turnSpeed = 5f;
public float firePauseTime = .25f;
public Transform target;
public Transform[] muzzlePositions;
public Transform turretBall;
private float nextFireTime;
private float nextMoveTime;
private Quaternion desiredRotation;
private Vector3 aimPoint;
// Update is called once per frame
void Update ()
{
if (target)
{
if (Time.time >= nextMoveTime)
{
CalculateAimPosition(target.position);
transform.rotation = Quaternion.Lerp(turretBall.rotation, desiredRotation, Time.deltaTime * turnSpeed);
}
if (Time.time >= nextFireTime) {
FireProjectile();
}
}
}
void OnTriggerEnter(Collider other)
{
if (other.gameObject.tag == "TurretEnemy")
{
nextFireTime = Time.time +(reloadTime *.5f);
target = other.gameObject.transform;
}
}
void OnTriggerExit(Collider other)
{
if (other.gameObject.transform == target) {
target = null;
}
}
void CalculateAimPosition(Vector3 targetPosition)
{
aimPoint = new Vector3 (targetPosition.x, targetPosition.y, targetPosition.z);
desiredRotation = Quaternion.LookRotation (aimPoint);
}
void FireProjectile()
{
nextFireTime = Time.time + reloadTime;
nextMoveTime = Time.time + firePauseTime;
foreach(Transform transform in muzzlePositions)
{
Instantiate(projectile, transform.position, transform.rotation);
}
}
}
The error is in the usage of Quaternion.LookRotation.
The function takes two Vector3 as input which are a forward direction in world space (and an optional up vector - default Vector3.up), and returns a Quaternion representing the orientation of such a reference frame.
You are instead supply a world space position as input (targetPosition), which makes no sense. Accidentally a normalized position vector expressed in world space is the direction from origin to the given point, so it works correctly when the tower is placed on the origin.
What you need to use as LookRotation parameter is the world space direction from the tower to the target:
Vector3 aimDir = (targetPosition - transform.position).normalized;
desiredRotation = Quaternion.LookRotation (aimDir );