Clean Up

Part of the Unity Scripting Basics section of Coddy's Unity journey. Lesson 62 of 67.

Challenge

Medium

The blocks never go away: after a minute of play, 60 of them are falling under the floor, and the script still moves every one. Keep everything from the earlier steps, and change the loop that moves the blocks:

A block whose y is below -1 is under the floor. Destroy it, and remove it from blocks so the loop stops moving it.

Press Play, then Check.

Try it yourself

using System.Collections.Generic;
using UnityEngine;

public class Runner : MonoBehaviour
{
    [SerializeField] private float speed = 6f;
    [SerializeField] private float laneEdge = 4f;
    [SerializeField] private GameObject blockPrefab;
    [SerializeField] private float spawnEvery = 1f;
    [SerializeField] private float fallSpeed = 5f;

    private List<GameObject> blocks = new List<GameObject>();
    private float timer;

    void Update()
    {
        Vector3 p = transform.position;
        p.x += Input.GetAxisRaw("Horizontal") * speed * Time.deltaTime;
        p.x = Mathf.Clamp(p.x, -laneEdge, laneEdge);
        transform.position = p;

        timer += Time.deltaTime;
        if (timer >= spawnEvery)
        {
            timer = 0f;
            Vector3 spot = new Vector3(Random.Range(-laneEdge, laneEdge), 10f, 0f);
            blocks.Add(Instantiate(blockPrefab, spot, Quaternion.identity));
        }

        foreach (GameObject block in blocks)
        {
            block.transform.position += Vector3.down * fallSpeed * Time.deltaTime;
        }
    }
}