# 01 Conditions

A **Condition** is a small object you attach to a node or path. It controls **who** can pass and **how expensive** the passage is.

## Built-in conditions

| Condition         | What it does                                                  |
| ----------------- | ------------------------------------------------------------- |
| **Always Pass**   | Trivial — placeholder. Always allows.                         |
| **Require Tag**   | Travelers must have a specific Gameplay Tag. Optional invert. |
| **Require Class** | Travelers must be a specific actor class (or subclass).       |

## Adding a condition to a node or path

1. Select the OWP Node or Path in the level.
2. In the **Details** panel, expand **OWP > Gameplay > Conditions**.
3. Click **+** and pick a condition class.
4. Configure its properties inline.

## Examples

| Want                          | Setup                                                |
| ----------------------------- | ---------------------------------------------------- |
| Pedestrian-only sidewalk      | Require Tag = `Locomotion.Pedestrian`.               |
| Vehicle-only highway          | Require Tag = `Locomotion.Vehicle`.                  |
| Guards-only patrol path       | Require Class = `BP_GuardNPC`.                       |
| Path forbidden to heavy units | Require Tag = `Size.Heavy` with **Invert Check** on. |

## Custom condition (Blueprint)

1. Content Browser → Add → Blueprint Class → Parent: **OWP Condition**.
2. Override **Can Pass** to return true/false.
3. Override **Get Cost Modifier** to return a multiplier (1.0 = normal, >1 = expensive, <0 = blocked).
4. Drop your custom condition into a node or path's Conditions array.

## Two outputs to know

| Output                | Meaning                                                      |
| --------------------- | ------------------------------------------------------------ |
| **Can Pass = false**  | Path is excluded from the route entirely.                    |
| **Cost Modifier > 1** | Path is more expensive (route avoids if alternatives exist). |
| **Cost Modifier < 0** | Path is blocked.                                             |

## Performance note

Conditions are evaluated during pathfinding. Keep your override cheap — no `Get All Actors of Class`, no slow loops. Read traveler tags or simple state.


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