Need help scripting an Object to appear on top of a random spawning platform.

Unity Engine
1

I’m making a game similar to IcyTower

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The script I have is to spawn platforms above the player randomly and delete all the platforms under the camera.

I want to spawn an object on top of a random platform and it when its picked up it will give extra score…(Object spawn randomly and often)
Because I’m also going to have another object that spawns every minute randomly on top of a random platform that when collected 10 times, the game will be over.

Please help

using UnityEngine;
using System.Collections;

public enum GameState { playing, gameover };

public class GameControl : MonoBehaviour {
	
    public Transform platformPrefab;
    public static GameState gameState;

    private Transform playerTrans;
    private float platformsSpawnedUpTo = 0.0f;
    private ArrayList platforms;
    private float nextPlatformCheck = 0.0f;

    
	void Awake () {
        playerTrans = GameObject.FindGameObjectWithTag("Player").transform;
        platforms = new ArrayList();

        SpawnPlatforms(25.0f);
        StartGame();
	}

    void StartGame()
    {
        Time.timeScale = 1.0f;
        gameState = GameState.playing;
    }

    void GameOver()
    {
        Time.timeScale = 0.0f; //Pause the game
        gameState = GameState.gameover;
        GameGUI.SP.CheckHighscore();
    }

	void Update () {
        //Do we need to spawn new platforms yet? (we do this every X meters we climb)
        float playerHeight = playerTrans.position.y;
        if (playerHeight > nextPlatformCheck)
        {
            PlatformMaintenaince(); //Spawn new platforms
        }

        //Update camera position if the player has climbed and if the player is too low: Set gameover.
        float currentCameraHeight = transform.position.y;
        float newHeight = Mathf.Lerp(currentCameraHeight, playerHeight, Time.deltaTime * 10);
        if (playerTrans.position.y > currentCameraHeight)
        {
            transform.position = new Vector3(transform.position.x, newHeight, transform.position.z);
        }else{
            //Player is lower..maybe below the cameras view?
            if (playerHeight < (currentCameraHeight - 10))
            {
                GameOver();
            }
        }

        //Have we reached a new score yet?
        if (playerHeight > GameGUI.score)
        {
            GameGUI.score = (int)playerHeight;
        }
	}



    void PlatformMaintenaince()
    {
        nextPlatformCheck = playerTrans.position.y + 10;

        //Delete all platforms below us (save performance)
        for(int i = platforms.Count-1;i>=0;i--)
        {
            Transform plat = (Transform)platforms[i];
            if (plat.position.y < (transform.position.y - 10))
            {
                Destroy(plat.gameObject);
                platforms.RemoveAt(i);
            }            
        }

        //Spawn new platforms, 25 units in advance
        SpawnPlatforms(nextPlatformCheck + 25);
    }


    void SpawnPlatforms(float upTo)
    {
        float spawnHeight = platformsSpawnedUpTo;
        while (spawnHeight <= upTo)
        {
            float x = Random.Range(-10.0f, 10.0f);
            Vector3 pos = new Vector3(x, spawnHeight, 12.0f);

            Transform plat = (Transform)Instantiate(platformPrefab, pos, Quaternion.identity);
            platforms.Add(plat);

            spawnHeight += Random.Range(1.6f, 3.5f);
        }
        platformsSpawnedUpTo = upTo;
    }


}
2

you could add an empty gameObject to the platform prefab as a “spawn point”, that’ll give you a position to create the extra objects.

Then you “just” need to do some timers to check if it’s time to spawn an extra object when the platforms are created. Might want to setup some variables to check if the bonus exists already too (when you spawn = true, when picked up = false etc.).

if (Time.time > lastSpawnTime + spawnDelay  !bonusExists)
{
//spawn bonus on the platform sets bonusExists to true
lastSpawnTime = Time.time;
}