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Place an extraction point

The extraction point is one actor, BP_ExtractionTrap: a floor hatch over a shaft. Players drop loot on it and press a button. The hatch opens and the loot falls into the chute, where it is sold. Once the quota is met, the hatch stays open and the players jump in to leave. By the end of this page you have one in your level, linked to a button.

  • The trap: Content/MPFriendslop/Blueprints/Environments/Doors/Childs/BP_ExtractionTrap
  • Its sign: Blueprints/Widgets/World/WBP_ExtractionSign
  • The floor decals: Materials/Environments/Decals/

How the trap decides

The trap carries four box zones. The server checks them every Detection Interval and sets the trap's status, an E_ExtractionStatus. The sign above the hatch shows it.

Status When Sign
Empty Nothing on the hatch Extract loot here
Blocked A player stands on the hatch. This wins over Ready CLEAR THE ZONE!
Ready Loot on the hatch and no player on it Press the button!
Evacuate The team met the quota. This wins over everything else JUMP IN!

The button only opens the hatch when the status is Ready. So nobody can drop a friend down the shaft to sell loot.

Zone What it does
DepositZone Finds loot lying on the hatch
SafeZone Finds players on the hatch. Loot inside it takes no damage. While the hatch is open for a sale, it stops players like a railing
SellZone In the chute. Loot that falls in is sold into the team bank
EvacZone At the bottom of the shaft. Once the quota is met, a player who lands here leaves the run

Place the trap

  1. Drag BP_ExtractionTrap into the level. Its pivot is the centre of the hatch at floor level.
  2. Keep the space under it open. The trap brings its own floor slab and its Chute, and the EvacZone sits about 480 cm below the pivot: nothing may stop a falling player above that depth. In L_Procedural, the trap stands in the outliner folder StartModule/Extraction, with nothing built under it.
  3. If your shaft is deeper or wider, select the zone in the Components panel and move it or change its Box Extent.
  1. Drag BP_InteractButton into the level, next to the hatch but outside it.
  2. Select its BP_ActivationLinkComponent.
  3. Add an entry to Targets and pick the trap with the eyedropper.
  4. Set Type on the button. The shipped map uses Hold, so a sale takes a deliberate press.

A lever works too, and so does anything that sends BPI_Activatable through a BP_ActivationLinkComponent. A lever turned on asks for a sale. Turned off, it closes the hatch. The link itself is explained on Link a button or a lever to a door.

After a sale, the hatch closes on its own. You never need a second press.

The fields

All of them are on the placed BP_ExtractionTrap.

Field What it does Default
Open Angle, in Settings|Door How far the two leaves drop, in degrees 90
Move Duration, in Settings|Door Seconds for the leaves to open or close 0.8
Hold Open Time, in Settings|Extraction Seconds the hatch stays fully open after a sale, before it closes 3
Detection Interval, in Settings|Extraction Seconds between two checks of the zones 0.2
Detection Object Types, in Settings|Detection The collision object types the zones look for WorldDynamic, Pawn, PhysicsBody

The sign

The sign is WBP_ExtractionSign, drawn on the trap's SignDisplay component. Its texts and colours are under Settings|Style: Empty Text, Blocked Text, Ready Text, Evacuate Text, and Empty Color, Blocked Color, Ready Color, Evacuate Color. Change them in the widget to change every trap.

Floor arrows and signs

The start room of L_Procedural guides players to the trap with two Decal Actors, Start_SignArrow_Hall and Start_SignLabel_Extraction, in the outliner folder StartModule/Signage. They use MI_Decal_ExtractionArrow and MI_Decal_ExtractionSign.

A decal paints everything inside its box, loot included. Keep Decal Size X at 10 and sink the actor slightly behind the floor or wall. A thicker box paints the arrow on every item dropped on it.

Two extraction points

Place a second BP_ExtractionTrap with its own shaft and its own button. Each trap has its own zones and its own sign. They sell into the same team bank, and both open for good when the quota is met.

The dispatchers

Dispatcher When it fires Fires on
OnZoneStatusChanged The trap's status changed. Gives the new Status every player

Next: Change the quota, the run length and the recap.

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