Add Production and Research

Complete Build Production Buildings first. The Barracks will train Soldiers and research Factory access through the same production queue.

1. Make the Soldier producible

Open SU_Soldier and add Sein Producible. Set Build Time to 5. Compile and save.

Create a Generic Ability named SA_Produce_Soldier:

Field	Value
Ability Name	Train Soldier
Dispatch Mode	Single
Resource Cost > Amounts	SeinARTS.Resource.Minerals → 50
Cost Timing	Production Queue
Blocked Tags	SeinARTS.State.UnderConstruction

Its graph is Event On Activate → Enqueue Production → End Ability. Use self as the target of Enqueue Production and SU_Soldier as Producible Class.

Override Can Activate. Call Get Production Data on Owner Entity and return true only if the read succeeds and Queue length is less than Max Queue Size. End Ability ends the enqueue action; the production system continues the queued work.

Grant SA_Produce_Soldier to the Barracks. Compile and save.

2. Set a rally point

Create a Generic Ability named SA_SetRallyPoint, Ability Name Set Rally Point, and Target Type Point.

On Activate, make a Fixed Transform with Location = Target Location, identity rotation, and scale (1, 1, 1). Pass it to the ability’s Set Rally Point function on self, then End Ability.

Grant it on the Barracks and Factory. On each building, add a Default Commands entry requiring RightClick and Target.Ground, with the generated tag SeinARTS.Ability.SetRallyPoint.

Produced Soldiers spawn at Spawn Point Offset and use their Movement Ability to travel to the rally point. Compile and save.

3. Display the production queue

Add a Vertical Box named ProductionQueue to the HUD SelectionPanel. In RefreshHUD, call Get Production Queue on the primary view model.

For this small read-only queue, display its contents in a Text Block named QueueText inside ProductionQueue:

1. Iterate the returned queue items.
2. Append each Display Name to a local String, separated by newlines.
3. For the first item, also append Progress Percent multiplied by 100, formatted with no fractional digits and a % suffix.
4. If Stalled At Completion is true, append Waiting for resources or capacity.
5. Set QueueText from that string; collapse ProductionQueue when the array is empty.

This display does not remove queue entries. The first item advances while later entries wait.

4. Create the unlock effect

Add the gameplay tag SeinARTS.Tech.FactoryUnlocked in Project Settings > Gameplay Tags.

In Content/Demo/Blueprints, create a SeinARTS Effect using its generic parent, named SE_Unlock_Factory. Configure:

Field	Value
Scope	Player
Duration Mode	Persistent
Granted Tags	SeinARTS.Tech.FactoryUnlocked
Forbidden Prerequisite Tags	SeinARTS.Tech.FactoryUnlocked

The effect needs no event graph for this unlock. While active, its Granted Tags belong to the researching player. Compile and save.

5. Create the research item and ability

Create a Generic Entity named SR_Unlock_Factory. Set its identity Display Name to Factory Access. Add Sein Producible with Is Research enabled and Granted Tech Effect SE_Unlock_Factory. Research takes ten seconds and applies the effect instead of spawning this entity.

Create a Generic Ability named SA_Produce_Research_Factory:

Field	Value
Ability Name	Research Factory Access
Dispatch Mode	Single
Resource Cost > Amounts	SeinARTS.Resource.Minerals → 100
Cost Timing	Production Queue
Blocked Tags	SeinARTS.State.UnderConstruction

On Activate, Enqueue Production with Producible Class SR_Unlock_Factory, then End Ability.

Override Can Activate. Return true only when all these checks pass:

• Get Production Data on Owner Entity succeeds and Queue length is below Max Queue Size.
• Player Has Tech Tag, using Get Entity Owner and SeinARTS.Tech.FactoryUnlocked, is false.
• No Barracks owned by that player has SR_Unlock_Factory queued.

For the duplicate check, call Lookup Entities By Tag with SeinARTS.Unit.Barracks. For each returned entity whose Get Entity Owner matches the researching player’s ID, read Get Production Data and inspect its Queue. Keep a local Boolean AlreadyQueued, initialized false before the loops and set true if an entry’s Actor Class equals SR_Unlock_Factory. Return false when a match is found; otherwise evaluate the final return after all producers have been checked.

Grant the research ability on the Barracks. These Can Activate checks prevent the player paying twice, whether the research is completed or waiting in another Barracks. The effect’s Forbidden Prerequisite Tags also describes the unlock restriction to callers of Get Tech Availability.

6. Gate Factory placement

Open SA_Place_Factory and add SeinARTS.Tech.FactoryUnlocked to Required Player Tags. Compile and save.

The existing Factory button remains visible but unavailable until research completes. The unlock applies to every Soldier owned by that player, including Soldiers produced later.

7. Test the loop

In a new session:

1. Build a Barracks. Train Soldier and Research Factory Access should be unavailable during construction.
2. After construction, right-click clear ground to set its rally point.
3. Train two Soldiers. Each costs 50, appears after five seconds at the building’s spawn offset, and moves to the rally point.
4. Queue Factory Access. Check its 100 cost and ten-second progress.
5. Select a Soldier before and after research. Build Factory should become available only after completion.
6. Build the Factory. It costs 200; harvesting supplies any missing Minerals.

Checkpoint

• Production costs are declared on abilities and build times on producible entities.
• The Barracks queue produces Soldiers and applies a research effect.
• A persistent player tag unlocks Factory placement.
• New units leave production through the same movement ability used for orders.

Continue with Add the Transport Truck.