Expedition rooms use vanilla Jigsaw Blocks and template pools. Do not use orange wool or custom marker blocks for connectivity.

Minecraft writes live Structure Block saves to the world folder with plural structures:

saves/<world>/generated/lanteacraft/structures/expedition/*.nbt

Packaged mod resources use singular structure:

src/main/resources/data/lanteacraft/structure/expedition/*.nbt

Template pools live here:

src/main/resources/data/lanteacraft/worldgen/template_pool/expedition/*.json

Import finished server structures from the generated folder into the packaged structure/expedition folder before shipping the mod.

Generate pools from packaged structures:

python tools/generate_expedition_pools.py

Import server-saved structures and regenerate pools:

.\gradlew.bat importExpeditionStructures

By default this imports from:

run/saves/New World/generated/lanteacraft/structures/expedition

For a different local/server world:

.\gradlew.bat importExpeditionStructures -PexpeditionGeneratedDir="E:\LanteaCraftServer\world\generated\lanteacraft\structures\expedition"

The underlying script is also available directly:

python tools/generate_expedition_pools.py --import-generated run/saves/TestWorld/generated/lanteacraft/structures/expedition

Validate packaged structures and pools:

.\gradlew.bat validateExpeditionStructures

or:

python tools/validate_expedition_jigsaws.py

Validate server-saved structures too:

python tools/validate_expedition_jigsaws.py --generated run/saves/TestWorld/generated/lanteacraft/structures/expedition

ExpeditionGenerator starts vanilla jigsaw placement with:

lanteacraft:expedition/start

and asks for this jigsaw name:

lanteacraft:expedition/door

At least one structure in the start pool, normally gate_room.nbt, must contain a Jigsaw Block whose Name is exactly:

lanteacraft:expedition/door

A spawning jigsaw connects when:

previous_jigsaw.target == candidate_piece_jigsaw.name

The previous piece chooses a target pool. Minecraft picks a candidate structure from that pool, then looks for a Jigsaw Block in the candidate whose Name matches the previous jigsaw's Target.

Expected basic flow:

gate_room → hall_1 → room/intersection/combat → reward_room

Useful socket names:

• Start: lanteacraft:expedition/door
• Halls: lanteacraft:expedition/hall_in, lanteacraft:expedition/hall_out
• Rooms/intersections: lanteacraft:expedition/room_in, lanteacraft:expedition/room_out
• Combat: lanteacraft:expedition/combat_in, lanteacraft:expedition/combat_out
• Reward: lanteacraft:expedition/reward_in

Expedition spawning starts Minecraft's jigsaw placement from lanteacraft:expedition/start. After Minecraft finishes generating the structure, the mod scans the generated blocks and replaces expedition marker blocks.

This applies to both /lanteacraft spawn_trial and expeditions generated after dialing an expedition address.

The reward lock uses the reward-room entrance jigsaw as its anchor. Put lanteacraft:expedition/reward_in at the center-bottom block of the reward doorway, facing out toward the room/path the player comes from. When the expedition spawns, that jigsaw block is replaced by a 5 wide by 5 tall Ancient Containment Block lock. When all tracked combat mobs are cleared, that same 5 by 5 area is cleared.

Other gameplay placement uses marker blocks inside the saved structures:

• Blue glazed terracotta: Stargate base position and facing.
• Cyan glazed terracotta: DHD position and facing.
• Lime wool: combat mob spawn position.
• Trapped chest: final reward chest. It is replaced with a normal filled chest.
• Chest or barrel: side loot container.
• Decorated pot: side loot jar.
• lanteacraft:expedition_reward_door_marker: reward lock marker. Put this at the center-bottom of the reward doorway. It is replaced with Ancient Containment Blocks and cleared when the trial is complete.

No starting jigsaw lanteacraft:expedition/door found

The start pool exists, but none of its structures has a Jigsaw Block with Name = lanteacraft:expedition/door. Add one to gate_room.nbt, save the structure, and rerun the validator.

Missing pool JSON

A Jigsaw Block references a pool that does not exist under data/lanteacraft/worldgen/template_pool/expedition/. Fix the pool field or regenerate pools.

Typoed socket names

If a previous jigsaw targets lanteacraft:expedition/room_in, at least one structure in that previous jigsaw's pool must contain a Jigsaw Block named lanteacraft:expedition/room_in.

Pool references missing structure

The pool JSON points at a structure location that has no packaged .nbt. Run the pool generator after copying the NBTs into src/main/resources/data/lanteacraft/structure/expedition/.

Generated structures saved in plural structures but not copied into singular structure

Structure Blocks save to the world generated/lanteacraft/structures/expedition/ folder. The mod jar reads packaged resources from src/main/resources/data/lanteacraft/structure/expedition/. Copy or import the generated files before building.