Doors the Warden can open¶
A sliding door opens on its own when an enemy walks into it. The door decides, not the enemy: the Warden has nothing to set up, and neither does an enemy you make yourself. By the end of this page your own door, hatch or gate opens for enemies too.
- The component on the doors:
Content/MPFriendslop/Blueprints/ActorComponents/BP_AIDoorOpenerComponent - The shipped doors:
Content/MPFriendslop/Blueprints/Environments/Doors/
In L_Procedural, every doorway between two modules gets a BP_SlidingDoor_Single, and the vault module has a BP_SlidingDoor_Double worked by two levers.
How it works¶
The Warden's paths go straight through doorways, closed or not: the moving parts of the doors do not count for the nav mesh. When a pawn walks into a door, the door's BP_AIDoorOpenerComponent checks who it is, on the server. A pawn possessed by an AIController fires On AI Pawn Bumped. A player, a thrown crate or a wall does nothing.
Each door answers On AI Pawn Bumped with its own way of opening.
| Door | What happens when an enemy bumps it |
|---|---|
BP_SlidingDoor_Single |
Slides open, unless a player is holding it |
BP_SlidingDoor_Double |
Opens, as if its lever were pulled |
BP_ExtractionTrap, levers, buttons |
Nothing. They have no BP_AIDoorOpenerComponent |
The enemy touches the door and waits while the door slides out of its way, under a second at the default Drive Speed, then walks on. It opens doors on its patrol, while it searches and while it chases you. It never closes one.
A player who grabs a single door and holds it keeps it shut: the Warden never forces a held door. It keeps pushing, and the door opens as soon as the player lets go.
A door does not stop a shot. Once a door is open, even partly, the Warden sees and fires through the gap as it would anywhere else.
Settings¶
On BP_AIDoorOpenerComponent, in the door's Components panel:
| Field | What it does | Default |
|---|---|---|
Opens For AI |
Untick it on a placed door to keep enemies out, for example a locked vault | ticked |
On BP_GrabAxisComponent of a single door:
| Field | What it does | Default |
|---|---|---|
Drive Speed |
How fast the door opens by itself, in full strokes per second | 1, about one second |
Make your own door open for enemies¶
- Open your door and add a
BP_AIDoorOpenerComponentin the Components panel. - Select it. In the Details panel, under Events, click the + next to
On AI Pawn Bumped. - From that event, open the door the way it already opens, for example by setting its replicated state.
Pawnis the enemy that bumped it. - Select each moving part in the Components panel and untick
Can Ever Affect Navigation. - In Class Defaults, tick
Replicates.
On AI Pawn Bumped only fires on the server, so the state you set there reaches every player the usual way. A player who joins late sees the door as it is.
It fires again on every frame the enemy keeps pushing. Open the door in a way that does no harm when it runs twice, like setting Is Open to true.
The start room is a safe zone¶
The Warden never walks into the start room of L_Procedural, but it shoots into it when it sees you. A NavModifierVolume with the NavArea_Null area covers the inside of the room and removes the nav mesh there. The Warden walks up to the doorway and stops.
To make another safe room, place a NavModifierVolume over it and set Area Class to NavArea_Null. Keep the doorway itself outside the volume.
Next: Make an enemy variant or your own enemy.