I'm a noob trying to make a game like this https://youtu.be/qxwO1wyz50w?t=37 , but i cannot figure out how to add collision to my line renderers. Would a line renderer be the way to go about this or is there a better way?
Here is my code so far (messy I know im new to programming as well )
public GameObject crossHair;
public LineRenderer line;
public Transform startPoint;
public GameObject lazer;
void Start()
{
Cursor.visible = false;
}
void Update()
{
crossHair.transform.position = Camera.main.ScreenToWorldPoint(Input.mousePosition);
if (Input.GetKeyDown(KeyCode.Mouse0))
{
LineSpawner();
startPoint.position = crossHair.transform.position;
}
}
void LineSpawner()
{
Vector2 shootDir = crossHair.transform.position - startPoint.transform.position;
GameObject lazerInstance = Instantiate(lazer);
line = lazerInstance.GetComponent<LineRenderer>();
line.SetPosition(0, startPoint.transform.position);
line.SetPosition(1, crossHair.transform.position);
Physics2D.Raycast(startPoint.transform.position, shootDir);
Debug.DrawRay(startPoint.transform.position, shootDir, Color.red);
}
Unfortunately, you cannot add a collider component to line renderers but a way around this is to create another gameobject that is invisible and make it a child of the line itself. What you then want to do is use the invoke("targetFunctionName", amountOfSeconds) method to destroy the collider gameobject after the player has hit it, this is so the game doesn't lag for those who are doing well while playing it. What you then want to do is add a physics material to the game object and set its bounciness property to max(which I think is 1). Do the same for the player's gameobject and you're done.
Related
In my game on unity 2d I have spaceship and a planet. The planet is orbiting a star so I made a script that parents the planet to the player when I get within a range so the planet doesn't fly past or into the player. This script makes the player move with the planet so they land on it and fly around it easily.
Here is the script
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class ParentPlayer : MonoBehaviour
{
[SerializeField] GameObject Player;
private float Dist;
[SerializeField] float Threshold;
private CircleCollider2D ParentTrigger;
// Start is called before the first frame update
void Start()
{
ParentTrigger = GetComponents<CircleCollider2D>()[1];
ParentTrigger.isTrigger = true;
ParentTrigger.radius = Threshold / transform.localScale.x;
}
// Update is called once per frame
void Update()
{
}
private void OnTriggerEnter2D(Collider2D collider)
{
if(collider.gameObject == Player)
{
collider.gameObject.transform.SetParent(transform);
}
}
private void OnTriggerExit2D(Collider2D collider)
{
if(collider.gameObject == Player)
{
collider.gameObject.transform.SetParent(null);
}
}
void OnDrawGizmos()
{
Gizmos.color = Color.red;
Gizmos.DrawWireSphere(transform.position, Threshold);
}
}
The problem is that as the planet rotates it ends up moving the player that has been parented to it. How can I make the planet's rotation not affect the position and rotation of the player, but still make the planets position affect the position of the player?
This might not be what you're looking for but I'm going to add it reguardless. Given that the Child-object will follow the parent, I would suggest putting the planet and spaceship as a child of the empty gameobject. Then you could rotate the the planet object, and if planets are in movement, you could add the movement to the parent object.
How about instead of parenting the player, write a script to set its position to the planets + some offset, and then the rotation wouldn't be an issue. Alternatively, if the player doesn't rotate at all, add constraints to its Rigidbody. Maybe something like this:
player.transform.position = planet.transform.position + offset;
Hope that works!
I'm making a game in unity where the user drags to shoot a ball at some objects at a distance. So far I have this DragAndShoot script:
//using System.Collections;
//using System.Collections.Generic;
using UnityEngine;
[RequireComponent(typeof(Rigidbody))]
[RequireComponent(typeof(Collider))]
public class DragAndShoot : MonoBehaviour
{
public Transform prefab;
private Vector3 mousePressDownPos;
private Vector3 mouseReleasePos;
private Rigidbody rb;
private bool isShoot;
void Start()
{
rb = GetComponent<Rigidbody>();
}
private void OnMouseDown()
{
mousePressDownPos = Input.mousePosition;
}
private void OnMouseUp()
{
mouseReleasePos = Input.mousePosition;
Shoot(mouseReleasePos-mousePressDownPos);
}
private float forceMultiplier = 3;
void Shoot(Vector3 Force)
{
if(isShoot)
return;
rb.AddForce(new Vector3(Force.y,Force.x,Force.z) * forceMultiplier);
isShoot = true;
createBall();
}
void createBall(){
Instantiate(prefab, GameObject.Find("SpawnPoint").transform.position, Quaternion.identity);
}
}
As you can see, I made the function createBall() in order to respawn a ball prefab at the position of the game object SpawnPoint. When I run the game, the first ball shoots fine. And another ball respawns.
Issue: when I shoot the second ball and it moves, one more ball seems to have appeared at the second ball somehow, and it moves as well. Not sure why this is happening and how to fix it - can someone pls help? Thanks.
The problem is that you need to Destroy() the game object you threw first. Since you are just bringing the objects back when click down again, here is what you should do:
Make it so that it destroys the old object. Because you just keep instantiating the object, then when you throw it again it throws the old one too. If you understand what I mean, then hopefully, you can turn this into what you want. (It wasn’t exactly clear what your game was; this is what I interpreted)
I have a game like CubeSurfer. When player goes through an collectable, two methods are called (for "jumping" and creating a cube under player). But, when player goes through second, or third collectable, nothing happens. I tried to attached script to collectable, and tried to put the method "OnTriggerEnter" in the body of methods "Start" and "Update". But it doesn't work.
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class PlayerCollider : MonoBehaviour
{
[SerializeField] Collider player;
[SerializeField] GameObject destroyIt;
[SerializeField] GameObject objToClone;
[SerializeField] Transform rootObjInScene;
Transform curParent;
Vector3 posOffset, posPlayer;
float distance = 1f;
private void OnTriggerStay(Collider player)
{
PlayerJumping();
CreateAnother();
Destroy(destroyIt);
}
public void PlayerJumping()
{
posPlayer = Vector3.up * distance;
Vector3 playerPos = rootObjInScene.position + posPlayer;
rootObjInScene.transform.position = playerPos;
}
public void Awake()
{
curParent = rootObjInScene;
posOffset = Vector3.down * distance;
}
public void CreateAnother()
{
Vector3 newPos = curParent.position + posOffset;
GameObject newObj = Instantiate(objToClone, newPos, Quaternion.identity, curParent);
curParent = newObj.transform;
}
}
You should also check your Rigibody collision detection mode in the inspector.
By default, this is set to Discrete, but if your object is fast-moving, you should set it to Continuous or ContinuousDynamic, otherwise the collisions won't be registered because the object is moving too quickly.
These are a little bit performance intensive, so I'd still recommreading up on the Unity documentation or digging through a couple of good articles to know what's best for you :)
You shouldn't call OnTriggerEnter explicitly (in your Update()), it's an event message and gets called automatically by unity when you enter a Collider marked isTrigger.
You can use OnTriggerEnter only if your collider is marked isTrigger, if you want to get a collision with a Collider that is not explicitly a trigger, you use OnCollisionEnter
To execute a method repeatedly while touching a Collider use OnCollisionStay, while touching or inside a Collider with isTrigger use OnTriggerStay
OnCollisionStay
OnTriggerStay
You can use OnCollisionStay or OnTriggerStay
void OnCollisionStay(Collision collisionInfo)
{
//Do something when collisionInfo.gameObject stay in this.gameObject collider
}
I have looked around the web for answers but can't find a working one.
I have tried changing the code and I am pretty sure it's a very easy noob mistake as this is my first game.
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class respawn : MonoBehaviour
{
[SerializeField] private Transform player;
[SerializeField] private Transform respawnPoint;
private Rigidbody Rigidbody;
void FixedUpdate()
{
if (player.position == respawnPoint.position);
{
GetComponent<Rigidbody>().velocity = 0;
Rigidbody.angularVelocity = 0;
}
}
private void OnTriggerEnter(Collider other)
{
player.transform.position = respawnPoint.transform.position;
}
}
The very first thing you want to do is to look at the Unity error console. Your code throws multiple errors, they will appear in red. Double-click on an error to be taken to its line in your code.
Also, try get a good editor, like VS Code, as it will help you find issues immediately by adding red wavy underlines. With above two approaches in hand, you will be able to find ~99% of your issues yourself the next time, and then can ask in forums for the remaining 1%.
Let's go through your code step by step:
private Rigidbody Rigidbody;
In Unity you normally want the type in upper case Rigidbody, but the variable name in lowercase rigidbody (even though the C# coding conventions suggest uppercase properties). Either way, don't use the same name as the type, so write:
private Rigidbody rigidbody;
or e.g. (I'm now omitting the default private, though you may also prefer to keep it, and I use a shorter variable name, and clarify its start value):
Rigidbody body = null;
In the following code:
GetComponent<Rigidbody>().velocity = 0;
... you first of all get the rigidbody component again. This isn't needed if you got it once in start (and for repeated usage, can lag), so do it like this:
void Start()
{
rigidbody = GetComponent<Rigidbody>();
}
And secondly, you assign a 0, but you want to assign new Vector3(0f, 0f, 0f), or just
rigidbody.velocity = Vector3.zero;
rigidbody.angularVelocity = Vector3.zero;
Lastly, you write
player.transform.position = respawnPoint.transform.position;
... but player and respawnPoint are already transforms, so you can use the simpler
player.position = respawnPoint.position;
Good luck!
When you enter the Trigger you will be teleported to the respawn position, but you cannot depend on FixedUpdate running on that exact pixel of the respawn position.
The most straigh forward answer is to, well, do the code as you would describe the issue: "When you enter a trigger, set the position to the respawn position and set velocity to 0":
I would change the entire script to:
public class respawn : MonoBehaviour
{
[SerializeField] private Transform player;
[SerializeField] private Transform respawnPoint;
private Rigidbody rigidbody;
void Start()
{
rigidbody = GetComponent<Rigidbody>()
}
private void OnTriggerEnter(Collider other)
{
player.position = respawnPoint.position;
rigidbody.velocity = Vector3.zero;
}
}
and don't forget to populate the player and respawnPoint values in the inspector.
Also, keep in mind that the current code is prone to errors, if you have other objects moving around. Right now, if ANY object enters the Trigger the PLAYER position will be reset. You could fix this with check for player
private void OnTriggerEnter(Collider other)
{
if (other.transform == player)
{
player.position = respawnPoint.position;
rigidbody.velocity = Vector3.zero;
}
}
I am trying to have my player ignore the collision with an edge collider on a platform i have.
Here's the script that I have added to the player
public class TestMovement : MonoBehaviour
{
public Rigidbody2D ball;
private GameObject purplePlat1;
private GameObject player;
// Start is called before the first frame update
void Start()
{
purplePlat1 = GameObject.Find("purple_plat");
player = GameObject.Find("circle-png-44659");
ball = GetComponent<Rigidbody2D>();
ball.AddForce(new Vector2(0, 10), ForceMode2D.Impulse);
Debug.Log("start");
}
// Update is called once per frame
void Update()
{
}
void OnCollisionEnter2D(Collision2D collision)
{
Physics2D.IgnoreCollision(purplePlat1.GetComponent<EdgeCollider2D>
(), GetComponent<CircleCollider2D>());
Debug.Log("collision");
}
}
The ball is still hitting the platform. I have confirmed that the oncollisionenter method is firing.
You can use the layer system of Unity to avoid collisions between both. Set a layer for a player and another for the edge and untick the collision between them.
What you can do is create a layer mask for the different type of game objects. Then, open your Physics2D settings.
On the bottom part, you can see a matrix of physics objects that can collide to one another. Just uncheck which layer should not collide with the other.