# 07 Recipes

Common patterns ready to copy. Each recipe is fully Blueprint-doable.

## 1. Patrol Route

**Goal:** AI walks a fixed list of waypoints in order, looping.

{% stepper %}
{% step %}

### Place nodes along your patrol path

Connect them with bidirectional paths.
{% endstep %}

{% step %}

### In your AI Blueprint, store the patrol nodes as an array

{% endstep %}

{% step %}

### On a state change ("start patrolling"), loop through the array

* For each node, call **OWP AI Move To** with **Target Actor** = the node.
* Wait for **On Success** before moving to the next.
  {% endstep %}

{% step %}

### When you reach the end, restart from index 0.

{% endstep %}
{% endstepper %}

**Tip:** Use **Get Patrol Route** to auto-generate a random patrol from a start node.

***

## 2. Vehicle Joining a Road

**Goal:** A car parked off-road drives to a destination on the network and parks somewhere off-road again.

{% stepper %}
{% step %}

### Use **OWP AI Move To** with **Target Location** = destination.

{% endstep %}

{% step %}

### Internally, OWP combines NavMesh entry → spline route → NavMesh exit (Free Pathfind).

{% endstep %}

{% step %}

### Set a higher **Step Distance** (400–600) for vehicles.

{% endstep %}

{% step %}

### Make sure your level has a NavMesh covering the parking lots and surrounding area.

{% endstep %}
{% endstepper %}

**Tip:** For tight road behavior (no swerving), set vehicle paths' **Path Width** = 0.

***

## 3. Faction-Restricted Path

**Goal:** Friendly factions can use this path; hostile factions can't.

{% stepper %}
{% step %}

### Add a **Require Tag** condition on the path.

{% endstep %}

{% step %}

### Set **Required Tag** = `Faction.Friendly`.

{% endstep %}

{% step %}

### In your AI controller, ensure the pawn's tags include `Faction.Friendly` or `Faction.Hostile`.

{% endstep %}

{% step %}

### The pathfinder automatically excludes the path for hostile travelers.

{% endstep %}
{% endstepper %}

**Variation: hostile pays cost penalty instead of being blocked.** Create a custom condition whose **Get Cost Modifier** returns 1.0 for friendly and 5.0 for hostile.

***

## 4. Save & Load

**Goal:** Persist runtime-spawned nodes and any tweaks across sessions.

{% stepper %}
{% step %}

### Create a USaveGame Blueprint with one variable: **OWP Snapshot** (type: `OWP Network Snapshot`).

{% endstep %}

{% step %}

### On save:

* Set the snapshot variable: **Save Network Snapshot** → into the variable.
* **Save Game To Slot** with your save object.
  {% endstep %}

{% step %}

### On load:

* **Load Game From Slot**.
* Read the snapshot variable.
* Call **Load Network Snapshot**.
  {% endstep %}
  {% endstepper %}

**Tip:** Always pass an explicit name when spawning runtime nodes — auto-generated names break load reliability.

***

## 5. Dynamic Roadblock

**Goal:** Close a road during a quest, reopen later.

### Option A — Toggle a Blocked Zone

{% stepper %}
{% step %}

### Place a **Blocked Zone** over the segment.

{% endstep %}

{% step %}

### Set **Is Active** = false initially.

{% endstep %}

{% step %}

### When the quest blocks it: set **Is Active** = true.

{% endstep %}

{% step %}

### Reopen: set **Is Active** = false.

{% endstep %}

{% step %}

### AI re-routes automatically the next time they request a path.

{% endstep %}
{% endstepper %}

### Option B — Disable the path itself

{% stepper %}
{% step %}

### Set the path's **Enabled** = false.

{% endstep %}

{% step %}

### AI re-routes automatically.

{% endstep %}
{% endstepper %}

**Tip:** Option A is better when you want to block a region (multiple paths). Option B is better for one specific path.

***

## 6. Group of AI Avoiding a Combat Zone

**Goal:** Patrolling guards avoid a danger area but assault troops accept the risk.

{% stepper %}
{% step %}

### Place a **Danger Zone** over the combat area.

{% endstep %}

{% step %}

### The default Cost Multiplier (×3) makes patrols re-route.

{% endstep %}

{% step %}

### For combat troops, you'd want them to **prefer** the zone — implement via a custom condition that reads the traveler's tag and returns negative cost (more attractive) for combat AI.

{% endstep %}
{% endstepper %}

***

## 7. Periodic Re-Path for Moving Target

**Goal:** AI chases a moving player without re-pathing every frame.

{% stepper %}
{% step %}

### Use a Behavior Tree.

{% endstep %}

{% step %}

### Add a **Service** that runs every 2 seconds.

{% endstep %}

{% step %}

### The Service updates the target blackboard key to the player's current location.

{% endstep %}

{% step %}

### The **OWP Move To** task reads the updated target and re-routes when it differs.

{% endstep %}
{% endstepper %}

This avoids the cost of pathfinding every frame while keeping the AI roughly accurate.


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