Land or Miss

Part of the Unity Scripting Basics section of Coddy's Unity journey. Lesson 85 of 85.

This challenge finishes the tower game, and the course's first section: a crane, a falling block, and a landing test with Mathf.Abs.

Challenge

Hard

Make each block land on the stack or fall away.

When the falling block is down to top's y + 1 and within 1 of top's x, set its y to exactly that, make it top, empty falling and log "Stack: " + count.
Otherwise, below y = -3, destroy it, empty falling and log Missed!.

Press Play and stack blocks: each landing logs the height. Then Check.

Try it yourself

using UnityEngine;

public class Crane : MonoBehaviour
{
    [SerializeField] private GameObject blockPrefab;
    [SerializeField] private Transform top;
    [SerializeField] private float craneSpeed = 3f;
    [SerializeField] private float craneEdge = 4f;
    [SerializeField] private float fallSpeed = 7f;

    private float direction = 1f;
    private Transform falling;
    private int stack;

    void Update()
    {
        transform.position += new Vector3(direction * craneSpeed * Time.deltaTime, 0f, 0f);
        if (transform.position.x > craneEdge) direction = -1f;
        if (transform.position.x < -craneEdge) direction = 1f;

        bool drop = Input.GetKeyDown(KeyCode.Space) || Input.GetMouseButtonDown(0);
        if (drop && falling == null)
        {
            Vector3 spot = new Vector3(transform.position.x, transform.position.y - 1f, 0f);
            falling = Instantiate(blockPrefab, spot, Quaternion.identity).transform;
        }

        if (falling != null)
        {
            falling.position += Vector3.down * fallSpeed * Time.deltaTime;
            // Landing on the stack: the next lesson.
        }
    }
}