Build Gun

The Build Gun is a tool engineers can use to place and dismantle buildings. It projects a hologram showing where the build-able structure will be placed, and highlighting key features such as belt inputs, outputs, and power sockets. Thick teal lines will be drawn if two buildings are aligned together. It is also the same tool that does resource scanning. The engineer will equip the tool before exiting the drop-pod. The tool is not craft-able and will still be equipped even after the engineer respawns or dies.

Build menu
The build menu is unlocked after the engineer has hand-mined the Iron Ore for the first time.

The build menu is opened with the key by default. Here all the buildings the engineer has unlocked are sorted into tabs. Left-clicking a building will exit the menu and display a hologram version of the building. The engineer can then position it where they want and then left-click again to build.

Buildings can also be added to the To Do List from the build menu.

Dismantle mode
The Build Gun can be brought out in dismantle mode by pressing the key by default. Buildings that the player's cursor is over will be highlighted, and can then be deconstructed by holding down left-click for 1 second. A blinking red border will appear around the screen to indicate that dismantle mode is active. Highlighted building in this mode will show you its name and refund cost. Dismantle a building give full refund.

Holding down while dismantle will enable mass-dismantle, up to 50 buildings at once. All buildings pointed by the mouse will be added to the dismantle list. You can release and then hold down the Ctrl key to 'skip' buildings.

Technical details
Placement and dismantle range is 100 meters (12.5 foundation lengths). Buildings can be rotated with by default, in increments of 10°, or 90° when placed on foundations.

Mass building
There are currently no systems in the game equivalent to blueprints (from Factorio) allowing for building multiple structures together. A blueprint system may be added post alpha.

Emote
Pressing the emote wheel and select 'twirl it' will display an animation showing engineer twirling the Build Gun.

Numeric Hot Keys
The numeric hotkeys have some initial defaults, but can be changed at any time.

To add a building to a hotkey, open the build menu, hover over the desired building then press a number key. The building is then mapped into that number.

Trivia

 * When exiting the drop pod at the start of the game, the engineer fastens a partly loose sticker on the Build Gun/Resource Scanner. The sticker is a picture of Box Boy from Coffee Stain Studios' very first game, I Love Strawberries, released in 2010.
 * The Build Gun has numerous lines of text printed on its casing.
 * SN: 0987654321
 * RU1F-M40
 * 41PH4-BUILD 1.0
 * 54L-T