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Collision Decisions + GAME OVER

1. Make a new method to spawn animals

  • In SpawnManager.cs, create a new void SpawnRandomAnimal() {} function beneath Update()
  • Cut and paste the code from the if-then statement to the new function
  • Call SpawnRandomAnimal(); if S is pressed

2. Spawn the animals at timed intervals

  • In Start(), use InvokeRepeating to spawn the animals based on an interval, then test.
  • Remove the if-then statement that tests for S being pressed
  • Declare new private startDelay and spawnInterval variables then playtest and tweak variable values

3. Add collider and trigger components

  • Double-click on one of the animal prefabs, then Add Component > Box Collider
  • Click Edit Collider, then drag the collider handles to encompass the object
  • Check the “Is Trigger” checkbox
  • Repeat this process for each of the animals and the projectile
  • Add a RigidBody component to the projectile and uncheck “use gravity”

4. Destroy objects on collision

  • Create a new DetectCollisions.cs script, add it to each animal prefab, then open it
  • Before the final } add an OnTriggerEnter function using autocomplete
  • In OnTriggerEnter, put Destroy(gameObject);, then test
  • In OnTriggerEnter, put Destroy(other.gameObject);

5. Trigger a “Game Over” message

  • In DestroyOutOfBounds.cs, in the else-if condition that checks if the animals reach the bottom of the screen, add a Game Over messsage: Debug.Log(“Game Over!”)
  • Clean up your code with comments
  • If using Visual Studio, Click Edit > Advanced > Format document to fix any indentation issues (On a Mac, click Edit > Format > Format Document)

6. Lesson Recap

New Functionality
  • Animals spawn on a timed interval and walk down the screen
  • When animals get past the player, it triggers a “Game Over” message
  • If a projectile collides with an animal, both objects are removed
New Concepts & Skills
  • Create custom methods/functions
  • InvokeRepeating() to repeat code
  • Colliders and Triggers
  • Override functions
  • Log Debug messages to console

    Pizza_gun
     
    using UnityEngine;

public class Pizza_gun : MonoBehaviour
{
    [SerializeField]
    public float Weapon_Bullet_Projectile_Speed = 60.0f;
    [SerializeField] 
    private float topBound = -60;

    // Update is called once per frame
    void Update()
    {
        transform.Translate(Vector3.forward * Time.deltaTime * Weapon_Bullet_Projectile_Speed);

       if (transform.position.z < topBound)
        {
            Destroy(gameObject);
        }

    }
    private void OnTriggerEnter(Collider other)
    {
        Destroy(gameObject);
        Destroy(other.gameObject);
    }
}
    Spawn_manager
  • using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class SpawnManager : MonoBehaviour
{
    public GameObject[] animalPrefabs = new GameObject[10];
    [SerializeField] 
    private float spawnRangeX = 20.0f;
    [SerializeField] 
    private float spawnPozY = -20.0f;
    [SerializeField]
    private float startDelay = 5f;
    [SerializeField]
   private float spawnInterval = 2f;
    // Start is called before the first frame update
    void Start()
    {
        // invoke repeating, will make the method or void def function with name "nameInQuotes"
        // it will call that function after , delay, then chozen interval
        InvokeRepeating("SpawnRandomAnimal", startDelay, spawnInterval);
    }

    // Update is called once per frame
    void Update()
    {
        if (Input.GetKeyDown(KeyCode.S))
        {
           SpawnRandomAnimal();
        }
    }
    void SpawnRandomAnimal()
    {
        // Select a random index within the array range
        int random_animal_Index = Random.Range(0, animalPrefabs.Length);
        Vector3 spawnPos = new Vector3(Random.Range(-spawnRangeX, spawnRangeX), spawnPozY, -30);
        // Instantiate the selected animalPrefab
        Instantiate(animalPrefabs[random_animal_Index], spawnPos,
            animalPrefabs[random_animal_Index].transform.rotation);
    }
}

  • movement

    using UnityEngine;

public class Movement : MonoBehaviour
{
    [SerializeField]
    private float speed = 10.0f;
    [SerializeField]
    private float xRange = 10.0f;
    [SerializeField]
    private float horizontalInput;
    [SerializeField] 
    public GameObject ProjectilePrefab;
    // Start is called before the first frame update
    void Start()
    {

    }

    // Update is called once per frame
    void Update()
    {


        horizontalInput = Input.GetAxis("Horizontal");
        // Calculate the desired position based on the input
        Vector3 desiredPosition = transform.position + Vector3.right * -horizontalInput * Time.deltaTime * speed;
        // Clamp the desired position within the x range
        float clampedX = Mathf.Clamp(desiredPosition.x, -xRange, xRange);
        desiredPosition = new Vector3(clampedX, desiredPosition.y, desiredPosition.z);
        // Move the object to the clamped position
        transform.position = desiredPosition;
        if (Input.GetKeyDown(KeyCode.Space))
        {
            // shoot pizza
            Instantiate(ProjectilePrefab, transform.position, ProjectilePrefab.transform.rotation);
        }
    }
}

    Animal Movement

    using UnityEngine;

public class AnimalMovement : MonoBehaviour
{


    public float Animal_Movement_Speed = 50.0f;
    public float lowerBound = 50;
    // Start is called before the first frame update
    void Start()
    {

    }

    // Update is called once per frame
    void Update()
    {
        transform.Translate(Vector3.forward * Time.deltaTime * Animal_Movement_Speed);
        if (transform.position.z > lowerBound)
        {
            Destroy(gameObject);
            Debug.Log("In the vernacular of your people... \n Game Over!");
        }
    }
}
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