Force Fields

Force Fields

A Force Field Emitter projects a wall or a hollow box of force field blocks. Permitted players walk through them. Everyone and everything else is stopped.

G G G     G = glass
I R I     I = iron ingot, R = block of redstone
I O I     O = observer

Setting up

1. Place the emitter facing where you want the field, and link it to your hub with the Linking Tool.
2. Use the emitter to open "Who can walk through this field?" (OFFICER or higher).
3. Choose the level, the shape and the size, and give the emitter power.

The emitter projects once its energy buffer holds about 5 seconds of draw. A new emitter projects a 5 × 5 wall, 2 blocks in front of it, that MEMBERs and above may pass.

Settings

• Level ladder and Keycard only: who may pass, exactly like a door. Only an OWNER can turn keycard-only on or off on a field, as with the OWNER level.
• Field on: switch the field off without unlinking the emitter.
• Shape: wall (flat, facing the same way as the emitter) or shell (a hollow box in front of the emitter).
• Distance: how far in front of the emitter the field starts.
• Width, Height and, for a shell, Depth: odd numbers, at least 1; a shell's depth is at least 3.
• Upgrades: four slots for Strength and Range Modules.

The screen refuses a shape that is too far away for the emitter's range (8 blocks, +4 per Range Module, up to 24) or that has too many blocks (400 at most).

Who gets through

• Players at or above the field's level pass, or with a keycard if the field is keycard-only.
• Owners always pass their own fields, keycard-only included, so a field can never seal its owner out.
• Mobs, projectiles, dropped items and vehicles never pass. A player riding something is stopped by what they are riding.
• During a lockdown only OWNER-level players pass.
• Field blocks cannot be mined. Only an owner of the installation (or an operator) can remove one by hand, and only in creative mode.
• Fields fill only air and replaceable blocks such as grass and snow (which do not come back). They are never placed where an entity is standing, and never inside land another player's claim protects. If something blocks part of the shape, the installation logs "Force field obstructed". A closed shell can still enclose someone who was already inside it.

Power and strength

• An emitter's strength is 1 plus one per Strength Module, up to the server's maxFieldStrength (5 by default).
• It draws energy every tick: a base amount plus more for every block and every point of strength. More blocks and more strength cost more.
• If the energy runs out, the field holds for a second, then collapses ("Force field collapsed") and comes back once the buffer refills.

Overload

A field is meant to slow a raid, not to stop one forever.

• Every hit from a player who may not pass, every projectile and every explosion adds load to the emitter and drains some of its energy. Load cools down over time.
• A stronger field holds more load.
• When the load is full, the whole field collapses ("Force field overloaded") and the emitter cannot project for 60 seconds. Breaking and re-placing the emitter does not cut that short.
• The emitter itself can always be broken, like any device.
• During a lockdown the field runs at the server's maximum strength, if the server allows it, for no extra power. A lockdown never resets the load.

A server can make fields unbreakable with forceFieldBreachable = false. That makes bases unraidable and is not recommended. forceFieldsEnabled = false turns every emitter off; field blocks left in the world then let everyone through and fade away.

The raid-server preset

For PvP and raiding servers, these values make fields weaker and slower to recover. Every other setting keeps its default. Put them in config/nerosecurity.properties.

Key	Default	raid-server
forceFieldBreachable	true	true
maxFieldStrength	5	3
maxFieldArea	400	256
fieldLoadCapacityPerStrength	40	25
fieldLoadDecayPerSecond	2.0	1.0
fieldExplosionLoadPerRadius	10	15
fieldMeleeLoad	1.0	1.5
forceFieldOverloadSeconds	60	180
fieldPowerPerBlockStrength	0.25	0.5
fieldLockdownRaisesToMax	true	true
doorMaxBlastResistance	3600	1200

See also

• Lockdown
• Blocks and Screens
• Home