I have a question about making a particle for jumping, like a dust cloud when the player jumps, here is my player script:
public class PlayerMovement : MonoBehaviour {
public float speed = 5f;
public Transform groundCheck;
public LayerMask groundLayer;
bool grounded = false;
Animator anim;
Rigidbody2D rgbd;
void Start () {
anim = GetComponent<Animator> ();
rgbd = GetComponent<Rigidbody2D> ();
}
void Update () {
}
void FixedUpdate (){
grounded = Physics2D.OverlapCircle (groundCheck.position, 0.2f, groundLayer);
float movex = Input.GetAxis ("Horizontal");
rigidbody2D.velocity = new Vector2 (movex * speed, rigidbody2D.velocity.y);
if (movex > 0){
transform.localScale = new Vector2(1,transform.localScale.y);
} else if (movex < 0){
transform.localScale = new Vector2(-1,transform.localScale.y);
}
if (Input.GetKey (KeyCode.UpArrow)){
if (grounded == true){
rgbd.AddForce (new Vector2(0f, 4f),ForceMode2D.Impulse);
} else {
grounded = false;
}
}
anim.SetFloat ("speed", Mathf.Abs (movex));
anim.SetBool ("grounded", grounded);
}
}
I want him to activate the particle system only once while in midair. I've tried a few things but when the player is in the air the particle system never stopped.
What most people do is create a new copy of the particle system on every need and destroy it later.
So what you would need is a brand new particle system. Expand the Emission tab. In there set the Rate to 0 (0 particles per second). Below Rate there should be an empty list called Bursts. Add one burst. Set Time to 0.0 (should be set by default) and number of particles to whatever you need. That will shoot 1 burst of particles whenever the particle system runs. Note that if Looping is ON than the burst will happen on beginning of every loop.
So far so good. Now make a prefab from it (watch a tutorial if you need). Then, in your code declare a Game Object variable that will serve you as a particle system:
public GameObject jumpParticles;
back to Unity, feed your prefab into the Jump Particles slot in inspector. Now it's all ready to be copied and pasted wherever you need it. So create a method for this:
void SpawnJumpParticles(Vector3 pos){
GameObject tmpParticles = (GameObject)Instantiate(jumpParticles, pos, Quaternion.identity); //look up how to use Instantiate, you'll need it a lot
Destroy(tmpParticles, 3f);
}
this code will spawn particles and auto-destory them in 3 seconds. The pos argument in the function is where the particles will get created. All that's left is to call it from your code where you start the jump. I'll leave that to you :)) good luck.
Related
So I'm new to unity only 2 days, and I'm having this problem of my player jumping in air. I can keep clicking the spacebar key and my player will keep jumping and not stop, I'm trying make it so the player can only jump while on the ground not the air. I been trying a lot of tutorials and most of them just made my game freeze up and not work anymore. I also been trying to find out how to use ground check but I'm still not sure on how to do that.
This is my code that I have right know.
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class PM : MonoBehaviour
{
public float moveSpeed;
public float jumpHeight;
Rigidbody2D rb;
void Start()
{
rb = GetComponent<Rigidbody2D>();
}
void Update() {
float moveDir = Input.GetAxis("Horizontal") * moveSpeed;
rb.velocity = new Vector2(moveDir, rb.velocity.y);
// Your jump code:
if (Input.GetKeyDown(KeyCode.Space))
{
rb.velocity = new Vector2(rb.velocity.x, jumpHeight);
}
}
}
Yes, you do need some sort of ground check. There are a lot of good tutorials online, for example, https://www.youtube.com/watch?v=c3iEl5AwUF8&t=17s ("3 ways to do a Ground Check in Unity").
To implement the simple "raycast down check", you need to assign the ground/platforms a layermask that is not the same as the player's layer. In this example, I have added a new layer named "Ground".
You can then use this simple code to do the test.
BoxCollider2D boxColliderPlayer;
int layerMaskGround;
float heightTestPlayer;
void Start()
{
rb = GetComponent<Rigidbody2D>();
// Get the player's collider so we can calculate the height of the character.
boxColliderPlayer = GetComponent<BoxCollider2D>();
// We do the height test from the center of the player, so we should only check
// halft the height of the player + some extra to ignore rounding off errors.
heightTestPlayer = boxColliderPlayer.bounds.extents.y + 0.05f;
// We are only interested to get colliders on the ground layer. If we would
// like to jump ontop of enemies we should add their layer too (which then of
// course can't be on the same layer as the player).
layerMaskGround = LayerMask.GetMask("Ground");
}
void Update()
{
float moveDir = Input.GetAxis("Horizontal") * moveSpeed;
rb.velocity = new Vector2(moveDir, rb.velocity.y);
// Your jump code:
if (Input.GetKeyDown(KeyCode.Space) && IsGrounded() )
{
rb.velocity = new Vector2(rb.velocity.x, jumpHeight);
}
}
/// <summary>
/// Simple check to see if our character is no the ground.
/// </summary>
/// <returns>Returns <c>true</c> if the character is grounded.</returns>
private bool IsGrounded()
{
// Note that we only check for colliders on the Ground layer (we don't want to hit ourself).
RaycastHit2D hit = Physics2D.Raycast(boxColliderPlayer.bounds.center, Vector2.down, heightTestPlayer, layerMaskGround);
bool isGrounded = hit.collider != null;
// It is soo easy to make misstakes so do a lot of Debug.DrawRay calls when working with colliders...
Debug.DrawRay(boxColliderPlayer.bounds.center, Vector2.down * heightTestPlayer, isGrounded ? Color.green : Color.red, 0.5f);
return isGrounded;
}
As you can see I expect the player character to have a BoxCollider2D - I guess you already have that since the character would otherwise fall through the ground). Be careful so you do not mix normal 3D colliders when you are doing 2D stuff.
First of all I'm new to Unity and Game programming. I'm trying to add a cricket bowling like animation. But when the ball touches the ground It doesn't bounce at all and it shows an weird rolling animation.
Here is the GIF,
So I just added the velocity in code,
public class Ball : MonoBehaviour {
public float EndPointX ;
public float EndPointY ;
bool ForceAdded = true;
private Rigidbody2D rigidBody;
void Start () {
rigidBody = GetComponent<Rigidbody2D> ();
}
void Update () {
rigidBody.velocity = new Vector3(EndPointX, EndPointY, 0)*2;
}
}
My Bounce 2d material file,
Ball Properties,
It bounces perfectly without any velocity. I mean when it falls in a straight angle.
Thanx For The Help!!
Since Update() runs every frame, you are continuously setting the velocity, and immediately overwriting the bounce materials attempts to change its direction of movement. If you move the velocity to your Start() method, the velocity will only be set once and the bounciness will be able to influence your object properly.
void Start () {
rigidBody = GetComponent<Rigidbody2D> ();
rigidBody.velocity = new Vector3(EndPointX, EndPointY, 0)*2;
}
I got a small arena where the player can move on. At the sides of the area there are spawners. These spawners instantiate bombs and should throw them at the player.
For the direction I actually use
transform.lookAt(playerTransform);
So this is a rough map
So the spawners are rotating around the map. They move from one point to the next point.
My bomb object got a rigidbody attached and the gravity is activated. I just need to find out how to make a spawner throwing a bomb to the player.
public class BombSpawner : MonoBehaviour
{
[Range(0, 3)]
[SerializeField]
private int nextPointIndex; // set the first targetpoint
private Vector3[] targetPoints = {
new Vector3(-15,0,15),
new Vector3(15,0,15),
new Vector3(15,0,-15),
new Vector3(-15,0,-15)};
private float movementSpeed = 10;
GameObject bombPrefab;
Transform player;
private void Start()
{
bombPrefab = Resources.Load(StringCollection.BOMB) as GameObject;
player = Globals.GetPlayerObject().transform;
}
private void Update()
{
transform.LookAt(player); // set the object rotation
Vector3 nextPoint = targetPoints[nextPointIndex]; // get the target point
transform.position = Vector3.MoveTowards(transform.position, nextPoint, movementSpeed * Time.deltaTime); // move the spawner
if (transform.position == nextPoint) // point reached? set a new point
{
if (nextPointIndex < targetPoints.Length - 1)
nextPointIndex++;
else
nextPointIndex = 0;
}
}
}
So I could write a method like this
void SpawnBomb()
{
GameObject spawnedBomb = Instantiate(bombPrefab);
}
but how do I achieve the throwing mechanic? For a first try, the targetPoint is player.position that should be fine.
You need to get the direction from spawner to the current position of the target, spawn the bomb and add force to that bomb using the direction you just got.
In order to do this you should substract your spawner's position from your target position.
Vector3 dir = target.transform.position - transform.position;
Now that you have the direction you can spawn your bomb and AddForce() to it. To add force you need to call the Rigidbody component of your spawned Bomb, like this:
spawnedBomb.GetComponent<Rigidbody>().AddForce(dir.normalized * force, ForceMode.Impulse);
Where dir is the direction towards the target (normalized - so the distance doesn't matter) and force is pretty much the speed of the bomb.
Here you can read more about Rigidbody.AddForce.
I have a blockbreaker type game coded using C# that mainly works fine but upon play testing i have found the ball will slow right down in certain situations! i.e if it wedges between to game object bricks the force of the ball rapidly slows down! 8 times out of ten this will not happen but other times it does and im unsure why! i will post the Ball script i think you will need to help solve this but should you need anymore information then please ask.
public class Ball : MonoBehaviour {
private Paddle paddle;
private bool hasStarted = false;
private Vector3 paddleToBallVector;
void Start () {
paddle = GameObject.FindObjectOfType<Paddle> ();
paddleToBallVector = this.transform.position - paddle.transform.position;
}
// Update is called once per frame
void Update () {
if (!hasStarted) {
//lock ball relative to the paddle
this.transform.position = paddle.transform.position + paddleToBallVector;
//wait for mouse press to start
if (Input.GetMouseButtonDown (0)) {
//if (Input.GetTouch(0).phase == TouchPhase.Ended){
hasStarted = true;
this.GetComponent<Rigidbody2D> ().velocity = new Vector2 (2f, 10f);
}
}
}
void OnCollisionEnter2D(Collision2D collision){
Vector2 tweak = new Vector2 (Random.Range(0f,0.2f),Random.Range(0f,0.2f));
if (hasStarted) {
GetComponent<AudioSource> ().Play ();
GetComponent<Rigidbody2D>().velocity += tweak;
}
}
}
You are adding directly to the velocity of the ball. The velocity variable defines a direction and speed, not just a speed as you are thinking here.
So, when the ball collides with a block it has a velocity of (+x, +y). After the collision and bounce is has a velocity of (+x, -y). So by adding a random positive value to the velocity when it has the -y velocity means that it will slow down the ball.
This does not happen every time because you are moving the ball in your Update() method. Change that to 'FixedUpdated()'. Fixed Update handles all physics calculations.
Also, I would recommend having a RigidBody2D on your Ball object. Moving physics objects should always have RigidBodies. With this, you can then use AddForce in the forward direction of your ball and that should solve your problem.
EDIT: I see you have a RigidBody2D already. I missed that the first time. Instead of having GetComponent<RigidBody2D>().velocity try GetComponent<RigidBody2D>().AddForce( transform.forward * impulseAmount, ForceMode.Impluse );
I am creating a game in Unity where I have to have a player (a ball) and three enemies (in this case three rotating cylinders). Whenever the player hits an enemy, I need it to die (which I have already done) and then print out Game over, which I don't know how to do. I also need the player to respawn after it dies, which is another think I don't know how to do. I also need to create three "virtual holes" where when the player rolls over them, it respawns, but not dies. I figure I can simulate holes by creating flat cylinders, but I don't know how to make the ball respawn but rolling over them. Thank you in advance!! Please be clear about which part does what in your answer.
//My player script
public class PlayerController : MonoBehaviour
{
public float speed;
private Rigidbody rb;
public float threshold;
public Text gameOver;
// Use this for initialization
void Start()
{
rb = GetComponent<Rigidbody>();
}
// Update is called once per frame
//rolls the player according to x and z values
void FixedUpdate()
{
float moveHorizontal = Input.GetAxis("Horizontal");
float moveVertical = Input.GetAxis("Vertical");
Vector3 movement = new Vector3(moveHorizontal, 0.0f, moveVertical);
rb.AddForce(movement * speed);
}
}
//my script that makes the enemy rotate and kills the player but after the
player dies it just disappears
public class Rotater : MonoBehaviour {
public Text gameOver;
// Update is called once per frame
void Update ()
{
transform.Rotate(new Vector3(15, 30, 45) * Time.deltaTime);
}
//kills player
void OnCollisionEnter(Collision Col)
{
if (Col.gameObject.name == "Player")
{
Destroy(Col.gameObject);
gameOver.text = "Game over!";
}
}
//my script that respawns the play if it falls off the maze
public class Respawn : MonoBehaviour
{
// respawns player if it goes below a certain point (falls of edge)
public float threshold;
void FixedUpdate()
{
if (transform.position.y < threshold)
transform.position = new Vector3(-20, 2, -24);
}
}
You need to create a UI to draw text over your game. You can learn about it here.
When you have the UI in place, you can just activate/deactivate the relevant parts with SetActive(bool).
To kill and respawn the player, I suggest you not to destroy it and re-instantiate it. Instead, you can simply deactivate it and reactivate it in the new position using SetActive(bool) again.
For the holes, you can create other objects with colliders and use OnCollisionEnter as you already did but to change player's position.