using UnityEngine;
using System.Collections;
public class chicken_for : MonoBehaviour {
// Use this for initialization
void Start () {
}
// Update is called once per frame
void FixedUpdate () {
if (collision.gameObject.Quad == collisionObject){
Application.LoadLevel("SciFi Level");
}
}
}
I am attempting to when A person touches a quad, he goes to this sci-fi fortress. It however says the name 'collision' does not exist in the current context.
You're referencing a variable (collision) that doesn't exist. You've got a variable collisionObject that doesn't exist, too.
collision is typically the name of the argument to the OnCollisionEnter method. Your code should probably be inside this method instead of FixedUpdate. I'm guessing that you've copied code from a tutorial somewhere but put it in the wrong method.
collisionObject on the other hand is harder to guess, but I expect that if your script is intended to be a component on the player object, then collisionObject should be your quad; if the script is on the quad then collisionObject should be the player.
Either way, you need to declare that variable - probably as a public field so that you can populate it from the inspector.
Add a new function and make sure the player is tagged as player in the inspector. You also need to make sure that there is a collider on the quad that the player touches and a rigidbody component on the player.
using UnityEngine;
using System.Collections;
public class chicken_for : MonoBehaviour {
//This function will handle the collision on your object
void OnCollisionEnter (Collider col){
if(col.gameobject.tag == "Player"){ //if colliding object if tagged player
Application.LoadLevel("SciFi Level"); //load the sci-fi level
}
}
// Use this for initialization
void Start () {
}
// Update is called once per frame
void Update () {
}
}
This should get you roughly where you want to be!
Related
I am writing a script that shows a collision between one object and an obstacle. The code runs but does not output within the console. Is there something that I am doing wrong?
using UnityEngine;
public class collision : MonoBehaviour{
void OnConllisionEnter (Collision collisionInfo)
{
if(collisionInfo.collider.tag == "Obstacle")
{
Debug.Log("We Hit an obstacle!");
}
}
}
I added a tag to the object as I will be adding more obstacles to simplify the process. I checked for semicolons and any other errors that would stand out to me. I am not sure what I am supposed to change or if I am missing something.
You actually have a typo in the methods name
// Here
// |
// v
void OnConllisionEnter (Collision collisionInfo)
The code should be
using UnityEngine;
public class collision : MonoBehaviour{
void OnCollisionEnter (Collision collisionInfo)
{
if(collisionInfo.collider.tag == "Obstacle")
{
Debug.Log("We Hit an obstacle!");
}
}
}
When using OnConllisionEnter, check your collider component to make sure the [Is Trigger] flag isn't checked
Collider Component, Is Trigger Flag
Also, remember that both objects have to have a collider component attached to them and only one of them will need a rigid body component attached to it (both of which have to match the correct world space, i.e. 2D/3D RigidBody and Collider.
More about Collisions:
https://docs.unity3d.com/ScriptReference/Collider.OnCollisionEnter.html
I am in the middle of creating a simple 3d platformer in unity and i'm trying to make it so if you are in a certain radius and you hit the "f" key the enemy will disappear. the way i'm checking to make sure the enemy is close enough to be attacked is to have trigger sphere and when its triggered and you press "f" the enemy will be removed. i'm currently trying to see what collided with the trigger but i cant figure it out. here is my current code
using UnityEngine;
public class PlayerCombat : MonoBehaviour
{
public GameObject Enemy1;
public GameObject Enemy2;
public GameObject Enemy3;
public GameObject Enemy4;
// Update is called once per frame
void OnTriggerEnter (Trigger triggerInfo)
{
if (triggerInfo.collider.tag == "Enemy" & Input.GetKey("f"))
{
if (triggerInfo.collider.name == Enemy)
{
Enemy1.SetActive(false);
}
}
}
}
The signature is and has always been OnTriggerEnter(Collider) otherwise that message method will not be recognized by Unity and not get called at all!
And then you already have the according Collider ... what else do you need?
public class PlayerCombat : MonoBehaviour
{
// There is no need to know the enemy references beforehand at all
// you will get all required references from the Collider parameter of OnTriggerEnter itself
// I personally would however expose these two settings to the Inspector to be more flexible
// this way you can adjust these two settings within Unity without having to touch your code
public string listenToTag = "Enemy";
public KeyCode listenToKey = KeyCode.F;
// The signature has to be this otherwise the message method is never invoked at all
private void OnTriggerEnter (Collider other)
{
// Rather use "CompareTag" instead of `==` since the latter will silently fail
// for typos and nonexistent tags while "CompareTag" shows an error which is good for your debugging
// And in general you want to use the logical "&&" instead of the bitwise operator "&" for bools
if (other.CompareTag(listenToTag) && Input.GetKey(listenToKey))
{
// simply set the object you collide with inactive
other.gameObject.SetActive(false);
}
}
}
Finally just make sure that all your enemy instances actually have the tag Enemy
First, I'm pretty sure OnTriggerEnter takes a Collider as its parameter, no? https://docs.unity3d.com/ScriptReference/Collider.OnTriggerEnter.html
You can get the name of the collided object like so
//Upon collision with another GameObject,
private void OnTriggerEnter(Collider other)
{
Debug.Log($"collided with {other.gameObject.name}");
//you can check for specific components too
MyComponent myComponent = other.GetComponent<MyComponent>();
if (myComponent != null) {
// do something if it has that component on it!
}
}
I am trying to make my player hit an object, destroying the object and triggering an animation, but everything I try causes an error. I am relatively new at c# so the answer may be obvious but I need help. How can I set it up so that the collision will cause the object to disappear and the player to play an animation? Here is the script I am currently trying.
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;
public class succ : MonoBehaviour
{
public float speed = .15f;
public static float jumpSpeed = 170f;
void Start()
{
GetComponent<ConstantForce2D>().enabled = false;
GameObject.Find("goal");
}
public bool animation_bool;
private object coll;
private object other;
void Update()
{
OnCollisionStay2D(Collision2D coll);
{
if (coll.gameObject.tag == "succ") ;
{
animation_bool = true;
GetComponent<Animator>().SetBool("succ", animation_bool);
GetComponent<ConstantForce2D>().enabled = true;
Destroy(other.object);
}
}
}
private void Destroy(object gameObject)
{
throw new NotImplementedException();
}
private void OnCollisionStay2D(Collision2D collision2D, object coll)
{
throw new NotImplementedException();
}
}
There are a few things I can see that are wrong, but I'll start by answering your question.
I suggest you change your MonoBehaviour method OnCollisionStay2D to OnCollisionEnter2D. OnCollisionStay2D is "sent each frame where a collider on another object is touching this object's collider". OnCollisionEnter2D is "sent when an incoming collider makes contact with this object's collider".
I believe you are looking for the latter since you only want to trigger this once during the collision. You are also destroying the other object, making it impossible to call OnCollisionStay2D anymore even if you wanted to do so.
You should also remove your Update method. I honestly do not understand what you are trying to achieve there now. All of the OnCollision methods get called automatically; you do not have to call them yourself.
Then you can use the Awake and OnCollisionEnter2D methods as follows
public class Succ : MonoBehaviour
{
private Animator animator;
private void Awake()
{
// You can already get a reference to the Animator on Awake
// This way you do not have to do it on every collision
animator = GetComponent<Animator>();
}
// Use OnCollisionEnter2D instead since the code
// needs to be excecuted only once during the collision
private void OnCollisionEnter2D(Collision2D collision)
{
if (collision.gameObject.CompareTag("succ")
{
// Assuming that you only want to trigger an animation once
// to reflect attacking or colliding, you could use SetTrigger
// instead. Otherwise you need to use SetBool again to set it
// back to false. You should then change the Animator parameter
// accordingly, from a bool to a trigger.
animator.SetTrigger("succ");
Destroy(collision.gameObject);
}
}
}
Apart from this, I have a few things I would like to comment on:
I am not sure what you are trying to achieve by setting your ConstantForce2D component to false on Start and then setting it to true on collision.
You seem to be using GameObject.Find on Start. GameObject.Find is something that should be very rarely used. It can be extremely expensive, especially if your Scene has a lot of GameObjects in it; this is because it simply goes through the Hiearchy, comparing the parameter string to names of GameObjects until it either finds a match or runs out of GameObjects.
Moreover, you are using GameObject.Find on Start to look for a GameObject, but then you do not store that anywhere, making the whole finding process completely pointless.
Overall, I recommend you to take a look at all of the different learning resources offered by Unity themselves. Your question is about fairly basic functionality that is certainly covered during all of the different tutorials.
This is semi complicated of a question but I'll do my best to explain it:
I am making this mobile game in which you have to shoot four cubes. I'm trying to make it so when the cubes are shot by a bullet, they're destroyed and a UI text says 1/4, to 4/4 whenever a cube is shot. But it's being really weird and only counts to 1/4 even when all four cubes are shot and destroyed. I put these two scripts on the bullets (I made two separate scripts to see if that would do anything, it didn't)
And to give a better idea of what I'm talking about, here's a screenshot of the game itself.
I've been using Unity for about 6 days, so I apologize for anything I say that's noob-ish.
EDIT
So I combined the two scripts onto an empty gameobject and here's the new script:
using UnityEngine;
using System.Collections;
using UnityEngine.UI;
public class GameManagerScript : MonoBehaviour {
public GameObject cubes;
public Text countText;
public int cubeCount;
public Transform target;
// Use this for initialization
void Start () {
}
void OnTriggerEnter(Collider other)
{
cubes = other.gameObject;
}
// Update is called once per frame
void Update () {
cubes.transform.position = Vector3.MoveTowards(transform.position, target.position, 1f * Time.deltaTime);
if (cubes.gameObject.tag == "BULLET")
{
cubeCount = cubeCount + 1;
countText.text = cubeCount + "/4";
cubes.SetActive(false);
}
}
}
ANOTHER EDIT
I tried everything, so is there a way to detect when all the children in a parent on the Hierarchy are destroyed? Instead of counting up? This can give a better idea:
So I want to be able to detect when Cube, Cube1, Cube2, and Cube3 have all been destroyed.
The answer is pretty simple: Since every individual bullet has that script, each bullet has its own score.
For something like a score you want a single spot to store it, e.g. a script on an empty gameobject that serves as game controller. Just access that in the collision and increase the score (maybe have a look on singletons here).
You can combine those two scripts and actually it might be better to not have this on the bullet, but on the target because there are probably less of them which will save you some performance. (And it does more sense from a logical point of view.)
Edit:
I assume you create the bullets using Instantiate with a prefab. A prefab (= blueprint) is not actually in the game (only objects that are in the scene/hierarchy are in the game). Every use of Instantiate will create a new instance of that prefab with it's own version of components. A singleton is a thing that can only exist once, but also and that is why I mention it here, you can access it without something like Find. It is some sort of static. And an empty gameobject is just an object without visuals. You can easily create one in unity (rightclick > create empty). They are typically used as container and scriptholders.
Edit:
What you want is:
An empty gameobject with a script which holds the score.
A script that detects the collision using OnTriggerEnter and this script will either be on the bullets or on the targets.
Now, this is just a very quick example and can be optimized, but I hope this will give you an idea.
The script for the score, to be placed on an empty gameobject:
public class ScoreManager : MonoBehaviour
{
public Text scoreText; // the text object that displays the score, populate e.g. via inspector
private int score;
public void IncrementScore()
{
score++;
scoreText.text = score.ToString();
}
}
The collision script as bullet version:
public class Bullet : MonoBehaviour
{
private ScoreManager scoreManager;
private void Start()
{
scoreManager = GameObject.FindWithTag("GameManager").GetComponent<ScoreManager>(); // give the score manager empty gameobject that tag
}
private void OnTriggerEnter(Collider other)
{
if(other.CompareTag("Target") == true)
{
// update score
scoreManager.IncrementScore();
// handle target, in this example it's just destroyed
Destroy(other.gameObject);
}
}
}
How can I add the game object from above (Roed Knap, Hand etc.) into the script given below (at the picture)?
This is an example project. I can't figure out to reference GameObject's and Colliders into a Script.
What I want to do is very simple.
Make a GameObject with a Collider, and trigger something when collision happens.
So What I have is basically a GameObject Cube that has a Collider sphere added and for this isTrigger is selected. I want this trigger when entering, modify the text. Can you help me with initializing, referencing and other stuffs necessary, see below code. This is the code I work with.
using UnityEngine;
using System.Collections;
public class NewBehaviourScript : MonoBehaviour {
GameObject Cube;
GUIText Text;
Collider collision;
// Use this for initialization
void Start () {
collision = Cube.GetComponent<Collider> ();
Text = GetComponent ("GuiText") as GUIText;
}
// Update is called once per frame
void Update () {
}
void onTriggerEnter(){
Text.text = "Won"
}
}
Unity uses C# syntax for all of MonoBehaviour and engine namings. That is, a method starts with cap letter:
void OnTriggerEnter(Collider col){}