> For the complete documentation index, see [llms.txt](https://travljen.gitbook.io/unit-system/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://travljen.gitbook.io/unit-system/getting-started/create-units/production-unit-mage-tower.md).

# Production unit (Mage Tower)

There are few ways to give the player access to the new resource.

* **Unit's Passive Resource Production** - Supports constant production of a resource.
* **Unit's Active Production** - Supports production of any producible object (resource, research, unit, etc.).
* **Resource Node** - Supports collectors to gather resource, either from node (entity) or structure (unit), like praying on temple structure for god's favour.
* Or you limit the player and only give him initial resource, no option to collect new. 

In previous tutorials we already covered the resource node and combat unit. Now we will create a **Mage Tower** that will produce **Crystals** passively and produce **Mages** actively.

## Step 1 (Asset)

To create **new production unit** we must again first create a `AUnitSO` data set with **capabilities**, before we create a prefab.

Open up the **UnitSystem window** and proceed with the steps:

1. Select **Unit** type

2. Click **Create New** button

3. Set desired **name** and **description** of the new unit

4. Set **cost** of the unit, resources player must consume to produce/place this unit

5. Set **requirements** research or other producible if applicable, like the new **Crystal Age** research.

6. Set **production attributes** like **Population Capacity** if this structure should increase housing of units. Additionally you can create new **Unit Limit attribute** which specify a **Mage unit**, this functionality limits player's max number of mages and each tower could increase the limit for X amount.

   <figure><img src="https://3582497942-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fy2G6fDLEPuCAcuABMl6j%2Fuploads%2FPMa6n4V2oqVf1HNgzTcg%2FMage%20Tower%20Asset%20-%20Main.png?alt=media&amp;token=30f58675-d237-4563-ab60-ac13184ff8e0" alt="" width="563"><figcaption><p>Mage Tower Asset 1/2</p></figcaption></figure>

7. Select **Capabilities** tab

   1. Add **Health capability** so that unit may be destroyed by enemy units.
   2. Add **Buildable** capability which enables the unit to be constructed before it becomes operational.
   3. Add **Passive Resource Production** **capability** and set production resource with its quantity produced per second.
   4. Add **Active Production capability** for production of **Mage** units.
      1. Here you can add support for the unit to produce any producible you have available.

   <figure><img src="https://3582497942-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fy2G6fDLEPuCAcuABMl6j%2Fuploads%2FrxubSdXym1rRgQsBSrUf%2Fimage.png?alt=media&amp;token=94bfa659-10d9-43b8-a15e-45d0b6e4949d" alt="" width="563"><figcaption><p>Mage Tower Asset 2/2</p></figcaption></figure>

## Step 2 (Prefab)

After data asset is created, we can proceed with creating a Unit prefab:

1. Click on the **Create Prefab** button if you wish for prefab to be created automatically.
2. Now click **Open Prefab** to and open **Scene** window to see it. You should see 5 components already present (**Unit**, **Health, UnitBuilding, UnitPassiveProduction** and **UnitProduction**).
3. **Configure visuals** as desired, by default a primitive cube model is present.
4. **Add collider** & **layer** to the **root game object**, primarily for selection and projectile collisions.

**Optional**

1. In case this unit will **produce and spawn other units** (like mage) then you should configure the default `UnitSpawnPoint` attached by default. This spawn point can be removed and replace with a custom `IUnitSpawn`.
2. **Manage object as obstacle on navigation path**.
   1. If you are using Unity's NavMesh system, you can add `NavMeshObstacle` component to define where navigation is not possible once building unit is placed.
      1. Additionally attach the `BuildingUnitNavMeshManager` component, this will toggle on/off obstacles and agents while unit is building respectively.
   2. If you are using a different navigation system, add it's obstacle component and create a new script to listen for events on `UnitBuilding` component where you can toggle your components on/off. See `BuildingUnitNavMeshManager` for example.
3. **Add building animation**:
   1. If you wish to use provided component add `RaiseBuildingAnimation`, set it's reference to the **animated transform** and **start offset** which will simply move the transform from offset back to `Vector3.zero` while building the unit.
   2. Or you can implement your own animations for building unit, by creating a component which derives from `ABuildingAnimation` class.
4. **For pre-defined interaction positions** use the `StaticInteractionPositionProvider` component.
   1. Select shape
   2. Define shape size
   3. Specify unit spacing
5. **Unit Selection - Integration**; If you are using Unit selection package for selecting units, check out the [Unit Selection](/unit-system/integration/unit-selection.md) page for more information.

<figure><img src="https://3582497942-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fy2G6fDLEPuCAcuABMl6j%2Fuploads%2FnWjolFR3g7R0kiokgYRu%2Fimage.png?alt=media&amp;token=11d01f22-0674-45bd-90c2-f0b2026df720" alt=""><figcaption><p>Mage Tower Prefab Example</p></figcaption></figure>

## Step 3 (Add to faction)

If you are using an existing faction for testing this new unit, you can open it up or to create new faction with steps here [Faction (Purple Cubes)](/unit-system/getting-started/create-units/faction-purple-cubes.md).

Then add the unit to **default actions** of the faction. These actions will be presented in demo scene when any unit that has **Builder** capability is selected.&#x20;