[Guide] Notable Map Generation Errors

[Lukas Kazda]

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awesome!

[Alp Apustaja]

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Based on the reference information and the user’s description, the solution was already found by the user: they were missing a Rigidbody2D component, which is required for trigger collisions to work properly in Unity.

The key insight is that for OnTriggerStay2D, OnTriggerEnter2D, and OnTriggerExit2D to function, both the object with the collider and the object entering/exiting the collider need to have a Rigidbody2D component (which can be set to kinematic if you don’t want physics-based movement).

[Alp Apustaja]

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Hi Lukas! It looks like you’ve got a link to a post about updating the current chunk in a map controller. If you have specific questions or need help with your code related to that topic, feel free to share the details here! I’m here to help!

[Alp Apustaja]

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Based on the reference information, the solution involves setting the BoxCollider2D on the Terrain Chunk to be a trigger. Specifically, the instructions state:

“We also need to add a BoxCollider2D and set it to be a trigger and the size should be the same as our tilemap so 20×20. We need this because Physics2D.OverlapCircle requires a collider.”

So make sure that:

1. The BoxCollider2D on each Terrain Chunk is set to “Is Trigger = True”
2. The collider size matches the tilemap (20×20)

This should allow the player to move freely between chunks without collision blocking movement.

[Hiếu Hoàng]

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hi i am facing an error while following what is in the video. after following what is written on the video, i have an issue where my map controller never gets updated. here is my code here is my chunk trigger code using System.Collections; using System.Collections.Generic; using UnityEngine;

public class ChunkTrigger : MonoBehaviour { MapController mc;

public GameObject targetMap;

void Start()
{
    mc = FindAnyObjectByType<MapController>();
}

private void OnTriggerStay2D(Collider2D col)
{
    if (col.CompareTag("Player"))
    {
        mc.currentChunk = targetMap;
    }
}

private void OnTriggerExit2D(Collider2D col)
{
    if (col.CompareTag("Player"))
    {
        if (mc.currentChunk == targetMap)
        {
            mc.currentChunk = null;
        }
    }
}

} here is my map controller code using System.Collections; using System.Collections.Generic; using UnityEngine;

public class MapController : MonoBehaviour { public List<GameObject> terrainChunks; public GameObject player; public float checkerRadius; public Vector3 noTerrainPosition; public LayerMask terrainMask; public GameObject currentChunk; PlayerMovement pm;

[Header("Optimization")]
public List<GameObject> spawnedChunks;
GameObject latestChunk;
public float maxOpDist; //Must be greater than the length and width of the tilemap
float opDist;
float optimizerCooldown;
public float optimizerCooldownDur;



void Start()
{
    pm = FindAnyObjectByType<PlayerMovement>();
}

void Update()
{
    ChunkChecker();
    ChunkOptimzer();
}

void ChunkChecker()
{
    if (!currentChunk)
    {
        return;
    }

    if (pm.moveDir.x > 0 && pm.moveDir.y == 0)
    {
        if (!Physics2D.OverlapCircle(currentChunk.transform.Find("Right").position, checkerRadius, terrainMask))
        {
            noTerrainPosition = currentChunk.transform.Find("Right").position;  //Right
            SpawnChunk();
        }
    }
    else if (pm.moveDir.x < 0 && pm.moveDir.y == 0)
    {
        if (!Physics2D.OverlapCircle(currentChunk.transform.Find("Left").position, checkerRadius, terrainMask))
        {
            noTerrainPosition = currentChunk.transform.Find("Left").position;    //Left
            SpawnChunk();
        }
    }
    else if (pm.moveDir.y > 0 && pm.moveDir.x == 0)
    {
        if (!Physics2D.OverlapCircle(currentChunk.transform.Find("Up").position, checkerRadius, terrainMask))
        {
            noTerrainPosition = currentChunk.transform.Find("Up").position; //Up
            SpawnChunk();
        }
    }
    else if (pm.moveDir.y < 0 && pm.moveDir.x == 0)
    {
        if (!Physics2D.OverlapCircle(currentChunk.transform.Find("Down").position, checkerRadius, terrainMask))
        {
            noTerrainPosition = currentChunk.transform.Find("Down").position;    //Down
            SpawnChunk();
        }
    }
    else if (pm.moveDir.x > 0 && pm.moveDir.y > 0)
    {
        if (!Physics2D.OverlapCircle(currentChunk.transform.Find("Right Up").position, checkerRadius, terrainMask))
        {
            noTerrainPosition = currentChunk.transform.Find("Right Up").position;   //Right up
            SpawnChunk();
        }
    }
    else if (pm.moveDir.x > 0 && pm.moveDir.y < 0)
    {
        if (!Physics2D.OverlapCircle(currentChunk.transform.Find("Right Down").position, checkerRadius, terrainMask))
        {
            noTerrainPosition = currentChunk.transform.Find("Right Down").position;  //Right down
            SpawnChunk();
        }
    }
    else if (pm.moveDir.x < 0 && pm.moveDir.y > 0)
    {
        if (!Physics2D.OverlapCircle(currentChunk.transform.Find("Left Up").position, checkerRadius, terrainMask))
        {
            noTerrainPosition = currentChunk.transform.Find("Left Up").position;  //Left up
            SpawnChunk();
        }
    }
    else if (pm.moveDir.x < 0 && pm.moveDir.y < 0)
    {
        if (!Physics2D.OverlapCircle(currentChunk.transform.Find("Left Down").position, checkerRadius, terrainMask))
        {
            noTerrainPosition = currentChunk.transform.Find("Left Down").position; //Left down
            SpawnChunk();
        }
    }
}

void SpawnChunk()
{
    int rand = Random.Range(0, terrainChunks.Count);
    Instantiate(terrainChunks[rand], noTerrainPosition, Quaternion.identity);

}

void ChunkOptimzer()
{
    optimizerCooldown -= Time.deltaTime;

    if (optimizerCooldown <= 0f)
    {
        optimizerCooldown = optimizerCooldownDur;   //Check every 1 second to save cost, change this value to lower to check more times
    }
    else
    {
        return;
    }

    foreach (GameObject chunk in spawnedChunks)
    {
        opDist = Vector3.Distance(player.transform.position, chunk.transform.position);
        if (opDist > maxOpDist)
        {
            chunk.SetActive(false);
        }
        else
        {
            chunk.SetActive(true);
        }
    }
}

} This is the screen after running the game

View post on imgur.com

Can anyone help me with this part?

[Alp Apustaja]

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Based on the reference information, there are a few potential issues:

1. Ensure the player object’s tag is set to “Player”
2. Make sure each Terrain Chunk has:
   • A Trigger BoxCollider2D
   • A Rigidbody2D component (can be kinematic)
   • Child objects named “Right”, “Left”, “Up”, “Down”, “Right Up”, “Right Down”, “Left Up”, “Left Down”
3. In the MapController, verify that:
   • The terrainChunks list is populated
   • The player reference is set
   • The checkerRadius is set to a small value (like 0.2)
   • The terrainMask is set to the Terrain layer

Could you confirm that you’ve set up all these components exactly as described in the reference information?

• Terence

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[Hiếu Hoàng]

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I followed all the instructions in the video and checked again but still got errors

[Alp Apustaja]

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Could you provide more specific details about the errors you’re experiencing? What exact error messages are you seeing, or what specific behavior is not working as expected? The more details you can share, the better I can help diagnose the issue.

• Terence

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[Hiếu Hoàng]

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I have a problem, can you help me?

View post on imgur.com

[Alp Apustaja]

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It looks like you’re trying to share an image link for context, but I can’t view external links directly. If you could describe the issue or any error messages you’re encountering, that would be really helpful!

Additionally, please make sure to check the following:

• Are the currentChunk and targetMap references set correctly?
• Is the Rigidbody2D on the player and the chunks configured properly?
• Are you seeing any debug logs in the console when you enter the trigger area?

Let me know, and I’ll do my best to assist you!

[Author]

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