[RESOLVED]Condition and Action have the ref object set to null after play, build

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August 23, 2018 at 3:36 pm #17187

gandi

Participant

Every time I try to play / build or reopen my project, all the conditions and actions with a reference on specific object type has been set to null.

The GameObjects are simple transform with this script:

using System.Collections;

using System.Collections.Generic;

using UnityEngine;

namespace TATA

{

public class Blabla : MonoBehaviour

{

public bool m_IsOccupied;

public TATA.TOTO m_TOTO;

public float m_Distance = 1.0f;

void Start ()

{

m_IsOccupied = IsOccupied();

}

void Update ()

{

m_IsOccupied = IsOccupied();

}

private bool IsOccupied()

{

foreach(var item in m_TOTO.m_liste)

{

if(Vector3.Distance(item.transform.position, this.transform.position) < m_Distance)

return true;

}

return false;

}

Idem with my own condition :

using NodeCanvas.Framework;

using ParadoxNotion;

using ParadoxNotion.Design;

using UnityEngine;

namespace TATA.Conditions

{

[Name("Blabla occupe")]

[Category("GameObject")]

public class IsOccupied : ConditionTask<Transform>

{

[RequiredField]

public BBParameter<TATA.Blabla> blabla;

protected override string info

{

get {return point_de_contention.isNull ? "Sélectionner le Blabla " : "Le Blabla " + blabla.value.name + " est occupé.";}

}

protected override bool OnCheck()

{

return blabla.value.m_IsOccupied;

}

August 24, 2018 at 8:51 am #17192

gandi

Participant

I use an old version of unity 2017.3.1f1 (64bit). Do you think that is the problem?

August 24, 2018 at 9:06 am #17191

gandi

Participant

Here a video to describe the bugs:

[video src="https://trello-attachments.s3.amazonaws.com/5b7a5bdc58445262d69378a6/5b7bc81b0a170a399d0c2c16/daef6ce771633d16a37003e37bb3cafd/NodeCanvas_Set_to_null_the_ref_objects.mp4" /]

Remark: The last sequence it’s show what’s happen when you close and re-open the project.

August 24, 2018 at 10:01 am #17190

gandi

Participant

THe bugs are the same with the last version of unity.

August 24, 2018 at 11:10 am #17189

gandi

Participant

To solve it i have to bind the graph to the owner. I don’t like that because i have different instance with the same graph.
But now it’s work.

August 25, 2018 at 11:05 am #17188

Gavalakis

Keymaster

Hello,

Just to clarify what is going on, it is that by Unity’s standard workflow,
Assets (like graph assets are) can not have references to scene object.
And this is the reason why your scene object references are lost.

When you Bind a graph though, it stops being an asset, but is rather “saved” and thus treated as a scene object alongside the owner gameobject and that is the reason why Bound graphs are able to have scene object references.

If you definitely want to use Asset Graphs, the way around this Unity limitation, is to utilize Blackboard Variables instead of directly referencing scene objects within the graph fields.
Because Blackboard, is a component that is attached on the GraphOwner gameobject and is thus saved in the scene (unless of course the owner is a prefab), it IS possible for Blackboard Variables to have scene object references.

Please let me know if this clarifies what is happening, or if you need further explanation or help 🙂
Thanks!

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