# \[Old Versions] How to use Enemies AI

## Standard first steps to use Character AI

1- [Create a JU Character in Simple Setup](/ju-tps-documentation/quick-start/how-to-create-a-ju-character-reskin-default-character-setup-new-characters.md#creating-a-ju-character)

2- Turn on [IsAI option](/ju-tps-documentation/quick-start/how-to-create-a-ju-character-reskin-default-character-setup-new-characters.md#controller-options) and <mark style="color:yellow;">**set tag**</mark> to Enemy(<mark style="color:yellow;">or any other tag that is not "Player"</mark>)

3- Add a **JU Health** component and **JU Inventory**

4- [Bake a NavMesh ](https://docs.unity3d.com/Manual/nav-BuildingNavMesh.html)

**Your JU Character is now an NPC who can die and also keep items.**

## Hit Box

To be able to deal damage by punches, make the Hitbox setup:

<div align="center"><figure><img src="/files/Bu0fh8GFHo1M1PFGsdvz" alt=""><figcaption></figcaption></figure></div>

Adjust the size of the hit boxes the way that best fits your character

## Zombie AI

The Zombie AI component makes the character walk to a destination or a Waypoint, follow the player and attack him with punches. Your character doesn't necessarily have to be a zombie, you can use this script to make an aggressive NPC for example.

<figure><img src="/files/ZMbB4ky5bM4zbQr15OQD" alt=""><figcaption></figcaption></figure>

As you can see in the GIF above, it only takes 3 clicks to setup a zombie enemy.

You can also adjust the parameters below to better adapt to what you want

| Default AI Class Parameters                                       | Description                                                                                              |
| ----------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------- |
| Destination                                                       | Destination                                                                                              |
| Waypoint Path                                                     | Waypoint Path                                                                                            |
| Distance To Finish One Point                                      | Distance to go to next waypoint/path index                                                               |
| Check Nearest Point On Part                                       | Checks the nearest point on the waypoint/path and prevents the AI from going back to a previous Waypoint |
| On Start Path \[<mark style="color:blue;">Unity Event</mark>]     | Event called when AI start path                                                                          |
| On Following Path \[<mark style="color:blue;">Unity Event</mark>] | Event called when AI walk along the path                                                                 |
| On Ended \[<mark style="color:blue;">Unity Event</mark>]          | Event called when AI reaches the end                                                                     |

| Zombie AI Parameters                                                  | Description                                                     |
| --------------------------------------------------------------------- | --------------------------------------------------------------- |
| Target Tags                                                           | Filter targets by tags                                          |
| Field Of View                                                         | AI field of view, it is by this sensor that will detect targets |
| Sensor Layer Mask                                                     | Layer Mask of **Field of View**                                 |
| Start Running At Distance                                             | Runs when the target is greater than this distance              |
| Attack At Distance                                                    | Attack at distance                                              |
| Aim Up Offset                                                         | Target direction height                                         |
| Look At Target Speed                                                  | Look at rotation speed                                          |
| Min Time To Attack                                                    | Min Time To Attack                                              |
| Max Time To Attack                                                    | Max Time To Attack                                              |
| On Follow Waypoint \[<mark style="color:blue;">Unity Event</mark>]    | Event called when AI follow a **WAYPOINT** path                 |
| On Follow AI Path \[<mark style="color:blue;">Unity Event</mark>]     | Event called when AI follow a **NAVMESH** path                  |
| On See Target \[<mark style="color:blue;">Unity Event</mark>]         | Event called when AI sees a target                              |
| On Stop Seeing Target \[<mark style="color:blue;">Unity Event</mark>] | Event called when AI stop seeing a target                       |

{% hint style="info" %}
Patrol AI's parameters are similar to Zombie AI's, so you can use the parameters above to configure Patrol AI in the same way.
{% endhint %}

## Patrol AI

The Patrol AI has an extremely similar setup to the Zombie AI, with the difference that it adds a **Inventory** and an **Item Switch Manager**. You can [add a weapon](/ju-tps-documentation/game-development/how-to-use-inventory-and-add-items.md) normally and the AI will start using it, and in the **Item Switch Manager** you can set the ID of the item it will equip by default.

<div align="left"><figure><img src="/files/xN5KOYap2PHYp4SWNXGJ" alt=""><figcaption></figcaption></figure></div>

You can create a Waypoint Path and assign it to the Patrol AI, and you will have a Patrol Enemy:

<div align="left"><figure><img src="/files/y2Wi3ZiW1gjztXJnto1R" alt=""><figcaption></figcaption></figure></div>

<figure><img src="/files/ZjkfGcDb1eumf68D7qfE" alt=""><figcaption><p>✅ Patrol AI configured successfully</p></figcaption></figure>


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