Parallel Belt Builder

A Factorio 2.0 mod that allows you to easily place multiple parallel transport belts by simply building a single reference belt path.

Features

• Parallel Placement (2 to 16 Belts): Adjust the total number of parallel belts you want to build, ranging from 2 up to 16.
• Direct Count Input: Set the belt count with the + / - buttons or type a number directly into the count field.
• Automatic Belt Detection: Automatically detects the type of transport belt you placed first (Yellow, Red, Blue, or custom belts from other mods) and replicates it across all parallel lines.
• Flexible Offsetting: Choose to build parallel lines on either the Left or Right side relative to the reference belt's movement direction.
• Placement Modes:
• Normal: Places physical belts using items from your inventory. If you run out of items mid-build, the mod automatically places the remaining belts as ghosts (blueprints), prioritizing placement from inner-to-outer and start-to-end. In editor mode or cheat mode, Normal placement builds physical belts without checking or consuming inventory items.
• Ghost: Places entity ghosts for all parallel lines without consuming any items.
• 90-Degree Corners & Complex Paths: Handles right-angle (90-degree) corners and multi-segment layouts. It automatically calculates intersection coordinates to trim/extend inner and outer curves for seamless connections.
• Obstacle Skipping: Automatically skips placements on water or colliding structures, only placing belts on valid buildable ground.
• Robust Validation: Detects and warns you about invalid layouts (branches, merges, disconnected lines, loops, 180-degree U-turns, or path collapse due to extremely tight inner corners) and prevents faulty placements.
• On-the-fly Corrections: If you make a mistake while building the reference path, simply deconstruct/remove the incorrect belts before pressing Build. The mod will automatically skip the deleted coordinates as long as the remaining layout forms a valid continuous path.
• Hotkeys & Esc Integration: Toggle the GUI at any time using Ctrl + Alt + Q (rebindable under Controls > Mod controls). Closing the GUI discards the current reference path.

How to Use

1. Open the settings GUI by clicking the Parallel Belt Builder shortcut icon or pressing Ctrl + Alt + Q.
2. Configure Count (2-16, using the buttons or direct numeric input), Side (Left/Right), and Placement (Normal/Ghost).
3. Place your reference transport belts in the world (either manually or by dragging). Recording starts automatically from the first belt placed while the GUI is open.
4. Click the Build button. The parallel belts/ghosts will be generated instantly, and the GUI stays open for the next path.
5. If you want to discard the current reference path without placing anything, click Clear.
6. Closing the GUI discards the current reference path.