HoloBuilder

HoloBuilder is a client-side schematic hologram builder for Minecraft. It loads local schematic files and renders them as a translucent in-world guide, so you can line up a build, check what is missing, and work layer by layer without installing anything on the server.

This first public version is published as a Beta: the core workflow is usable, but feedback from real worlds and different schematic files is still expected.

What It Does

HoloBuilder focuses on planning and visual building:

• Load schematic files from holobuilder/schematics/.
• Preview the structure as an in-world hologram.
• Compare expected blocks with the current world.
• Highlight incorrect blocks in red.
• Optionally show already-correct blocks with subtle outlines.
• Move the placement relative to the direction you are looking.
• Rotate the schematic by 90 degrees around its center.
• Work with one Y layer at a time.
• Preview required materials from the schematic selection screen.
• Export selected areas into supported schematic formats.

The mod is client-side only. It does not need to be installed on the server.

Supported Files

The schematic selector currently accepts:

• .holo
• .litematic
• .schem
• .schematic

The native .holo format is the safest format for this Beta. External schematic formats are supported, but some files may still expose edge cases depending on their metadata and block states.

Basic Usage

1. Put schematic files in:

<game directory>/holobuilder/schematics/

2. Press H in game.
3. Select a schematic.
4. Click Charger.
5. Move, rotate, or switch layers until the hologram is aligned.

No schematic is loaded automatically when joining a world.

Controls

Default keybinds:

• H: open schematic selector.
• G: toggle schematic rendering.
• Numpad 8 / 2: move forward/backward relative to your horizontal view direction.
• Numpad 4 / 6: move left/right relative to your horizontal view direction.
• Numpad 9 / 3: move up/down.
• Numpad + / -: rotate by 90 degrees.
• Numpad 7 / 1: show higher/lower layer.
• X: show all layers.
• Numpad 5: reload the active schematic.

All keybinds can be changed in Minecraft's controls menu. The HUD displays your rebound keys instead of hardcoded defaults.

Selection And Export

HoloBuilder includes simple client commands for selecting and exporting a cuboid area:

• /holopos 1
• /holopos 2
• /holopos info
• /holopos clear
• /holo save <format> [name]

Supported export formats:

• holo
• schematic
• schem
• litematic
• litematica as an alias for litematic

Exports are written to holobuilder/schematics/.

Creative Build Tools

HoloBuilder includes optional build assist tools for creative mode:

• B: direct-build all missing/incorrect blocks.
• V: toggle auto placer for the aimed hologram block.
• C: toggle full auto build for the aimed hologram block.

These tools are only available in creative mode and use normal Minecraft /setblock commands. On multiplayer servers, they still depend on server permissions and rules. HoloBuilder suppresses its own vanilla /setblock feedback spam locally, but it does not change world gamerules.

Survival gameplay remains visual-only: no automatic block placement is available there.

Compatibility

• Minecraft 26.1.2