> For the complete documentation index, see [llms.txt](https://renownedgames.gitbook.io/ai-tree/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://renownedgames.gitbook.io/ai-tree/api/user-scripting/custom-key.md).
# Custom Key
In the AI Tree you can easily create your own task by using scripting API. In this page we will show how you can do it.
{% hint style="success" %}
In this context, we believe that you have already read the previous pages of [**User Scripting**](/ai-tree/api/user-scripting.md) section.
{% endhint %}
In the previous section, we created a task for the platform moving. Let's create unique key for defining point A, B and speed.
Create new script and call it **PlatformKey**, after creation open it script in you scripts editor tool.
> **Create -> MonoBehaviour Script**
PlatformKey script in project window
***
Default Unity MonoBehaviour script template.
```csharp
using UnityEngine;
public class PlatformKey : MonoBehaviour
{
// Start is called once before the first execution of Update
// after the MonoBehaviour is created
void Start()
{
}
// Update is called once per frame
void Update()
{
}
}
```
***
First of all we need to decide what we will define as key. Let's create new struct **PlatformData**. Don't forget to add `[Serializable]` attribute for custom types.
```csharp
using UnityEngine;
using System;
[Serializable]
public struct PlatformData
{
public Vector3 pointA;
public Vector3 pointB;
public float speed;
}
public class PlatformKey : MonoBehaviour
{
// Start is called once before the first execution of Update
// after the MonoBehaviour is created
void Start()
{
}
// Update is called once per frame
void Update()
{
}
}
```
***
Now we are ready to define our **PlatformData** key. We need to change the **PlatformKey** class.
* Remove all methods.
* Change `MonoBehaviour` parent class to `Key`
```csharp
using RenownedGames.AITree;
using System;
using UnityEngine;
[Serializable]
public struct PlatformData
{
public Vector3 pointA;
public Vector3 pointB;
public float speed;
}
public class PlatformKey : Key { }
```
{% hint style="success" %}
Done. It's all required steps to define your our key in AITree. Any other type can be used instead of the **PlatformData** type.
{% endhint %}
***
Now we can update **MovePlatformTask** class.
```csharp
using RenownedGames.AITree;
using UnityEngine;
[NodeContent("Move Platform", "Tasks/Custom/MovePlatformTask")]
public class MovePlatformTask : TaskNode
{
[SerializeField]
private PlatformKey platformKey;
private Transform transform;
private Vector3 destination;
protected override void OnInitialize()
{
base.OnInitialize();
transform = GetOwner().transform;
destination = platformKey.GetValue().pointB;
}
protected override void OnEntry()
{
base.OnEntry();
PlatformData data = platformKey.GetValue();
if(destination == data.pointA)
{
destination = data.pointB;
}
else
{
destination = data.pointA;
}
}
protected override State OnUpdate()
{
if(Vector3.Distance(transform.position, destination) > 0.1f)
{
float speed = platformKey.GetValue().speed;
transform.position = Vector3.MoveTowards(transform.position, destination, speed * Time.deltaTime);
return State.Running;
}
return State.Success;
}
}
```
Platform key in Inspector window
***
We can improve displaying of **PlatformKey** in editor. For that we will use [**Apex**](https://assetstore.unity.com/packages/slug/183345) library what included in AITree out of box.
{% hint style="info" %}
All editor classes, tasks, keys, decorators, components in AI Tree powered by Apex.
{% endhint %}
Open **PlatformKey** class add following attributes on field of PlatformData struct.
```csharp
using RenownedGames.AITree;
using RenownedGames.Apex;
using System;
using UnityEngine;
[Serializable]
public struct PlatformData
{
[HideLabel]
public Vector3 pointA;
[HideLabel]
public Vector3 pointB;
[LabelWidth(100)]
public float speed;
}
public class PlatformKey : Key { }
```
Now our PlatformKey looks much better.