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Normal•10mo ago

Cant destroy object

I have a boss object that i instantiate with the following code:

using Normal.Realtime;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class SpawnBoss : MonoBehaviour
{
    #region Variables
    [Header("Variables")]
    [SerializeField] private Transform spawnPoint;
    public string bossName;


    #endregion

    private void OnTriggerEnter(Collider other)
    {
        if (other.CompareTag("Player"))
        {
            Realtime.Instantiate(bossName, spawnPoint.position, spawnPoint.rotation);
        }
    }
}

using Normal.Realtime;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class SpawnBoss : MonoBehaviour
{
    #region Variables
    [Header("Variables")]
    [SerializeField] private Transform spawnPoint;
    public string bossName;


    #endregion

    private void OnTriggerEnter(Collider other)
    {
        if (other.CompareTag("Player"))
        {
            Realtime.Instantiate(bossName, spawnPoint.position, spawnPoint.rotation);
        }
    }
}

But when i try to destroy it with a Realtime.Destroy i get the error in the attached image

kapa.ai•3/17/25, 12:33 PM

Hi @

Mike the Floof Wizard

. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base.

kapa.ai•3/17/25, 12:34 PM

----------------------
Based on your code and the error you're encountering when trying to destroy a boss object instantiated with Normcore, I can help troubleshoot this issue.

The error likely occurs because you're trying to destroy an object that wasn't properly instantiated with or you're not referencing the object correctly when calling .

Here are some potential solutions:

Make sure you're storing a reference to the instantiated boss object:

When destroying the object, use that reference:

Alternatively, you can destroy it using the RealtimeView component:

According to the Normcore documentation, must be used instead of Unity's for objects instantiated with Realtime Class Reference.

Also, make sure that:

Your boss prefab has a RealtimeView component on its root GameObject
The prefab is located in a Resources folder so it can be found by all clients
You're not trying to destroy the object from a client that doesn't have ownership of it

If you're still encountering issues, you might need to check ownership of the object before destroying it:

kapa.ai•3/17/25, 12:34 PM

This approach is recommended to prevent multiple clients from trying to destroy the same object simultaneously, which can cause errors like "Server attempted to delete value from set for key that doesn't exist in storage" Common Questions.

Unity: 2021.3.16f1
Normcore: 2.1
----------------------
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kapa.ai•3/17/25, 12:34 PM

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💥✨Mike the Shadow Wizard✨💥OP•3/17/25, 12:54 PM

@Normcore Assistant I am now spawning it correctly from one script. But when i try to destroy it in another script i get a nullreferenceexception

kapa.ai•3/17/25, 12:54 PM

Let me check the knowledge base for you again. One moment!

kapa.ai•3/17/25, 12:55 PM

----------------------
I can see why you're getting a NullReferenceException in your BossHealth script. The issue is that you're trying to access and , but the variable is never initialized in your code.

Here are a few ways to fix this:

Option 1: Find the SpawnBoss reference

You need to initialize the variable in your Start method:

Option 2: Use the current GameObject

If you don't need to reference the spawner, you can simply destroy the current GameObject:

Option 3: Pass the reference when instantiating

A better approach would be to modify your SpawnBoss script to set a reference to the boss instance on the BossHealth component after instantiation:

Then in your BossHealth script:

Additional Notes

kapa.ai•3/17/25, 12:55 PM

Since your BossHealth inherits from RealtimeComponent, you should be using the model to synchronize health across clients RealtimeComponent. Your commented code suggests you were working on this.
Make sure your BossHealth script is attached to a GameObject that has a RealtimeView component, and that the RealtimeView lists BossHealth in its components section RealtimeView.
If you're still having issues, check if your custom RealtimeComponent is properly syncing by ensuring is being called Synchronizing Custom Data.
----------------------
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kapa.ai•3/17/25, 12:55 PM

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💥✨Mike the Shadow Wizard✨💥OP•3/17/25, 1:00 PM

@Normcore Assistant I tried using my commented code for managing the bosshealth but i am still getting the same nullreference exception

kapa.ai•3/17/25, 1:00 PM

Let me check the knowledge base for you again. One moment!

kapa.ai•3/17/25, 1:00 PM

----------------------
I can see a few issues in your code that are likely causing the NullReferenceException:

Issue 1: Model Access

You're trying to access and in your Start method, but the model might not be initialized yet. When using RealtimeComponents, the model is set by Realtime when you connect to the room, and it might not be available in Start().

Issue 2: SpawnBoss Component

You're trying to get the SpawnBoss component from the same GameObject that has the BossHealth component:

But it's likely that the SpawnBoss component is on a different GameObject, not on the boss itself.

Solution:

Here's how to fix these issues:

Use the method to initialize your model values:

Make sure your BossMoveModel has the necessary properties:

Use the SetSpawner method you've already created, but make sure it's called from the SpawnBoss script after instantiation:

```csharp
// In your SpawnBoss.cs
public GameObject bossInstance;
public GameObject bossBodyInstance;

kapa.ai•3/17/25, 1:00 PM

private void OnTriggerEnter(Collider other)
{
if (other.CompareTag("Player"))
{
bossInstance = Realtime.Instantiate(bossName, spawnPoint.position, spawnPoint.rotation);

// Get the BossHealth component and set a reference to this spawner
BossHealth bossHealth = bossInstance.GetComponent<BossHealth>();
if (bossHealth != null)
{
bossHealth.SetSpawner(this);
}
}
}

csharp
void Update()
{
if (model != null && model.currentHealth <= 0 && spawner != null)
{
Realtime.Destroy(spawner.bossInstance);
Realtime.Destroy(spawner.bossBodyInstance);
}
}
```

According to the Normcore documentation, when using RealtimeComponents, you should wait for the model to be set before accessing it Common Questions. The model is set by Realtime when you connect to the room, and it might not be available in Start().

Also, make sure your BossHealth component is properly registered with a RealtimeView on your boss prefab Synchronizing Custom Data.
----------------------
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----------------------

kapa.ai•3/17/25, 1:00 PM

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💥✨Mike the Shadow Wizard✨💥OP•3/17/25, 1:30 PM

@Normcore Assistant i am still getting the same nullreference exception. At line 25 of my BossHealth script. Somehow the script cant find my bossInstance

kapa.ai•3/17/25, 1:30 PM

Let me check the knowledge base for you again. One moment!

kapa.ai•3/17/25, 1:30 PM

----------------------
I can see that you're still having issues with the NullReferenceException at line 25 of your BossHealth script, which is likely the line where you're trying to access .

The issue is that your variable is still null when you try to access it. Let's troubleshoot this step by step:

The Problem

Looking at your code, there are two possible causes for the NullReferenceException:

The variable is null
The variable is not null, but is null

## Solutions

Verify the SetSpawner method is being called

Make sure your SpawnBoss script is actually calling the SetSpawner method after instantiating the boss:

Add null checks in your BossHealth script

Add thorough null checks to prevent the exception:

kapa.ai•3/17/25, 1:30 PM

Alternative approach: Use direct GameObject reference

Instead of relying on the spawner reference, you could simply destroy the current GameObject:

Check for RealtimeView issues

According to the Normcore documentation, you might be encountering issues with your RealtimeComponent not being properly registered with a RealtimeView Synchronizing Custom Data.

Make sure:

Your boss prefab has a RealtimeView component
The BossHealth component is listed in the RealtimeView's components list
If it's not listed, try removing and re-adding the BossHealth component

### 5. Debug with logging

Add debug logs to help identify where the issue is occurring:

```csharp
void Start()
{
Debug.Log("BossHealth Start called");
// Your existing code
}

public void SetSpawner(SpawnBoss spawnerRef)
{
Debug.Log("SetSpawner called with: " + (spawnerRef != null ? "valid spawner" : "null spawner"));
spawner = spawnerRef;
}

kapa.ai•3/17/25, 1:30 PM

void Update()
{
if (model != null && model.currentHealth <= 0)
{
Debug.Log("Health <= 0, spawner is: " + (spawner != null ? "not null" : "null"));
// Your existing code
}
}
```

These debugging steps should help you identify exactly where the issue is occurring and fix the NullReferenceException.
----------------------
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----------------------

kapa.ai•3/17/25, 1:30 PM

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💥✨Mike the Shadow Wizard✨💥OP•3/17/25, 1:40 PM

@Normcore Assistant My script is not finding the bosshealth component and i am also getting the error in the attached image

kapa.ai•3/17/25, 1:40 PM

Let me check the knowledge base for you again. One moment!

kapa.ai•3/17/25, 1:40 PM

----------------------
I can see the issue in your SpawnBoss script. The problem is with the timing of when you're trying to access the BossHealth component.

The Issue

You're trying to get the BossHealth component from immediately after instantiating , but before is actually created. Looking at your code:

You instantiate first
You start a coroutine to spawn after a delay ()
You immediately try to access before the coroutine has completed

Since is null at this point (it hasn't been instantiated yet), you get a NullReferenceException.

Solution

Move the BossHealth component check inside the coroutine, after has been instantiated:

Additional Notes

kapa.ai•3/17/25, 1:40 PM

According to the Normcore documentation, you should be careful when parenting objects with RealtimeViews. The documentation states: "We generally recommend that you don't [reparent]. Normcore will not synchronize parent relationships between objects." Common Questions
Make sure your BossHealth component is properly registered with a RealtimeView on your boss body prefab. If it's not showing up in the RealtimeView's components list, try removing and re-adding the BossHealth component Synchronizing Custom Data.
If you're still having issues, check if the BossHealth component is on the prefab or if it's actually on the prefab. Your code assumes it's on the body, but it might be on the main boss object.
----------------------
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----------------------

kapa.ai•3/17/25, 1:40 PM

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💥✨Mike the Shadow Wizard✨💥OP•3/17/25, 1:44 PM

@Normcore Assistant The destroy works now, but my bossBodyInstance is an empty with 4 children attached to it. If i hit 1 of these children everything gets destroyed, how do i give each child a seperate health bar

kapa.ai•3/17/25, 1:44 PM

Let me check the knowledge base for you again. One moment!

kapa.ai•3/17/25, 1:45 PM

----------------------
I understand you want to implement separate health bars for each child of your bossBodyInstance in your NormalVR project. Let's address this using Normcore's components.

Creating Separate Health for Children

You have a few options to implement separate health for each child of your bossBodyInstance:

Option 1: Add BossHealth Component to Each Child

You can add a separate BossHealth component to each child object:

Option 2: Create a Manager Script

Create a manager script on the parent that tracks the health of all children:

```csharp
public class BossPartsManager : RealtimeComponent<BossPartsModel>
{
[SerializeField] private List<BossPartHealth> bossParts = new List<BossPartHealth>();
private SpawnBoss spawner;

kapa.ai•3/17/25, 1:45 PM

protected override void OnRealtimeModelReplaced(BossPartsModel previousModel, BossPartsModel currentModel)
{
// Initialize model if needed
}

void Start()
{
// Find all child parts
bossParts.AddRange(GetComponentsInChildren<BossPartHealth>());
}

void Update()
{
// Check if all parts are destroyed
bool allPartsDestroyed = true;
foreach (var part in bossParts)
{
if (part != null && part.IsAlive())
{
allPartsDestroyed = false;
break;
}
}

if (allPartsDestroyed && spawner != null)
{
// All parts destroyed, destroy the whole boss
Realtime.Destroy(spawner.bossInstance);
}
}

public void SetSpawner(SpawnBoss spawnerRef)
{
spawner = spawnerRef;
}
}

csharp
public class BossPartHealth : RealtimeComponent<BossPartModel>
{
[SerializeField] private int maxHealth;

protected override void OnRealtimeModelReplaced(BossPartModel previousModel, BossPartModel currentModel)
{
if (currentModel != null && currentModel.isFreshModel)
{
currentModel.maxHealth = maxHealth;
currentModel.currentHealth = maxHealth;
}
}

private void OnTriggerEnter(Collider other)
{
if (other.CompareTag("Ball") || other.CompareTag("Bullet"))
{
model.currentHealth--;

if (model.currentHealth <= 0)
{
// Destroy just this part
Realtime.Destroy(gameObject);
}
}
}

public bool IsAlive()
{
return model != null && model.currentHealth > 0;
}
}
```

Important Considerations

kapa.ai•3/17/25, 1:45 PM

RealtimeView Components: Each child object that has a health component needs its own RealtimeView component RealtimeView.
Model Registration: Make sure your custom RealtimeComponents are properly registered with their respective RealtimeViews. If you don't see your component in the RealtimeView's components list, try removing and re-adding it Synchronizing Custom Data.
Ownership: Be mindful of ownership when destroying objects. You may need to request ownership before destroying Ownership and Lifetime Flags.
Parent-Child Relationships: Remember that Normcore doesn't automatically synchronize parent-child relationships between objects with RealtimeViews. You'll need to handle this manually if needed.
Model Implementation: Don't forget to create the appropriate model classes (BossPartModel, BossPartsModel) with the necessary RealtimeProperty attributes for health values.

By implementing one of these approaches, you should be able to give each child of your bossBodyInstance its own health system while still maintaining the overall boss structure.
----------------------
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----------------------

kapa.ai•3/17/25, 1:45 PM

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💥✨Mike the Shadow Wizard✨💥OP•3/17/25, 1:51 PM

@Normcore Assistant I see you are using a BossPartsModel in the manager script. Can you show me what BossPartsModel looks like

kapa.ai•3/17/25, 1:51 PM

Let me check the knowledge base for you again. One moment!

kapa.ai•3/17/25, 1:51 PM

----------------------
I'd be happy to show you what a BossPartsModel might look like for your NormalVR project. Here's an example implementation of the BossPartsModel class:

This model uses a RealtimeArray to track the IDs of all boss parts. The model also includes properties to track whether all parts are destroyed and optionally the total and remaining part counts.

After creating this class, you'll need to compile the model in Unity. The model compiler will generate the necessary code to synchronize this data across all clients.

For the individual boss parts, you would also need a BossPartModel:

Remember that when using RealtimeModels, you need to:

kapa.ai•3/17/25, 1:51 PM

Add the attribute to your class
Make the class
Add attributes to each property you want to synchronize
Compile the model in Unity

This approach follows the pattern shown in the Synchronizing Custom Data documentation.
----------------------
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kapa.ai•3/17/25, 1:51 PM

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💥✨Mike the Shadow Wizard✨💥OP•3/17/25, 1:53 PM

@Normcore Assistant Which of these 2 models would i use for this script?

kapa.ai•3/17/25, 1:53 PM

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kapa.ai•3/17/25, 1:54 PM

----------------------
For your BossPartsManager script, you would use the BossPartsModel that I showed you previously:

And for your BossPartHealth script, you would use the BossPartModel:

These models follow Normcore's RealtimeModel pattern where:

Each model is marked with the attribute
Each property you want to synchronize is marked with
The classes are declared as to allow Normcore to generate the networking code

Remember that after creating these model classes, you'll need to compile them in Unity. In Unity 2021+, this happens automatically. In older versions, you'll need to manually compile the models by highlighting the class and clicking "Compile Model" Room > RealtimeModel.
----------------------
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💥✨Mike the Shadow Wizard✨💥OP•3/17/25, 1:59 PM

@Normcore Assistant I get an Duplicate 'RealtimeModel' attribute error on my BossPartModel

kapa.ai•3/17/25, 1:59 PM

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kapa.ai•3/17/25, 2:00 PM

----------------------
I can help you with that duplicate 'RealtimeModel' attribute error. This is a common issue when working with Normcore models.

The error occurs when you have the attribute applied twice to the same class. This typically happens in one of these scenarios:

You've manually added the attribute twice in your code
You're using Unity 2021+ where Normcore automatically generates model code, but you're also trying to manually compile the model

Here's how to fix it:

First, make sure you only have the attribute once at the top of your BossPartModel class:

If you're using Unity 2021+, Normcore automatically generates the model code for you. You don't need to manually compile the model or add any autogenerated code sections Synchronizing Custom Data.
If you're using Unity 2019/2020, make sure you're not adding the autogenerated code manually. The model compiler will add it for you when you click "Compile Model" in the inspector Synchronizing Custom Data.
Check if you have any duplicate model files in your project. Sometimes this happens if you've copied a script and forgotten to rename it.

kapa.ai•3/17/25, 2:00 PM

After making these changes, try recompiling your project. If you're still having issues, you might need to restart Unity to clear any cached compilation errors.
----------------------
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kapa.ai•3/17/25, 2:00 PM

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💥✨Mike the Shadow Wizard✨💥OP•3/17/25, 2:02 PM

@Normcore Assistant my bossParts model gets the following error:
The type 'int' cannot be used as type parameter 'TValue' in the generic type or method 'RealtimeArray<TValue>'. There is no boxing conversion from 'int' to 'Normal.Realtime.Serialization.IModel'.

kapa.ai•3/17/25, 2:02 PM

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kapa.ai•3/17/25, 2:02 PM

----------------------
I can see the issue with your BossPartsModel. The error occurs because RealtimeArray can only store RealtimeModel objects, not primitive types like integers.

According to the Normcore documentation, RealtimeArray is "a special model type that represents an unordered collection of models" RealtimeArray<TValue>. This means you can't directly store primitive types like in a RealtimeArray.

Here's how to fix your BossPartsModel:

Option 1: Create a wrapper model for your integers

Option 2: Use a different collection type

If you just need to track which parts are alive/dead, you could use a different approach:

Then in your BossPartsManager script, you can just track the parts locally and update the model properties:

kapa.ai•3/17/25, 2:02 PM

This approach is simpler and avoids the need for a RealtimeArray altogether.

Remember that according to the Normcore documentation on Supported Primitives, only specific types can be used directly in RealtimeModels, and collections like RealtimeArray can only contain other RealtimeModel objects.
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kapa.ai•3/17/25, 2:02 PM

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