RoadMarker

RoadMarker is a powerful builder's utility for Minecraft Fabric that creates 3D extruded highways, smooth subpixel curves, road markings, cliff smoothing, and diagonal curb bevels using stairs, slabs, and coral fans. Gone are the days of jagged stepped lines, tedious hand-placed road slopes, and awkward terrain transitions. RoadMarker combines 3D profile extrusion, adaptive slope smoothing, and a 2x2 subpixel rasterization engine with global dynamic programming optimization to place and orient blocks seamlessly.

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Features

• Wand-Based In-Game Workflow: Quick planning with real-time particle previews before modifying the world.
• Native Axiom Editor Integration: Use all RoadMarker features directly inside the Axiom editor via the official companion addon.
• Multiple Generation Modes:
  • extrude: Full 3D road cross-section extrusion along curves with automatic slope smoothing (slabs) and dominant road material foundations.
  • wall_smooth: Procedural smoothing of cliffs and walls of arbitrary thickness into ~45° diagonal stair runs facing the player.
  • draw: Subpixel road markings and lines across terrain.
  • border: Automatic road curb and bevel generator that bevels the road edge towards the surrounding terrain.
  • smooth: In-place smoothing that converts existing full-block lines into smooth stair curves in a single click.
• Curve Algorithms:
  • line: Ultra-crisp subpixel straight lines between 2 points.
  • bezier: Smooth N-point Bezier curves (unlimited control points).
  • catmull: Catmull-Rom splines passing directly through every control point.
• Dual Material Support for Markings:
  • Stairs: Perfect 1/4 and 2/4 subpixel stair orientations (straight runs, adaptive corner stairs).
  • Coral Fans: Floor coral fans for corners and wall coral fans for straight runs (placed dry without water).
• Multi-level Undo / Redo: Revert or re-apply changes with /rm undo and /rm redo (or native Ctrl+Z / Ctrl+Y in Axiom).
• Multiplayer and Operator Safe: Non-destructive particle preview, respects server permissions.

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Axiom Integration

RoadMarker includes a dedicated companion addon — RoadMarker Axiom Integration — allowing you to build directly within the Axiom editor:

• Dedicated Tool in Axiom Toolbar: Adds a native RoadMarker tool with a custom RM icon to Axiom's tools window.
• All Modes Supported: Switch between extrude, draw, and wall_smooth directly inside Axiom with real-time visual previews.
• Native History Support: Every operation integrates directly into Axiom's undo/redo history buffer with localized descriptions and accurate modified block counts.
• Precise Point Placement: Control points snap directly inside target blocks rather than floating in the air, ensuring accurate surface alignment without height offsets. (Available as a companion file on this page: RoadMarker-Axiom-Integration.jar)

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Quick Start

Wand Workflow

1. Get the wand with /rm wand.
2. Select your desired mode with /rm mode <draw|extrude|wall_smooth|border|smooth>.
3. Pick your material (or select 2 points to capture a 3D road cross-section in extrude mode).
4. If using draw or extrude, select curve type: /rm line, /rm bezier, or /rm catmull.
5. Left-Click blocks in the world to place control points (or define a 2-point box).
6. Review the glowing particle preview.
7. Right-Click in the air with the wand to instantly build.

Axiom Workflow

1. Select the RoadMarker tool from the Axiom tools window.
2. Choose your mode (extrude, draw, or wall_smooth) in the tool settings.
3. Click blocks in the viewport to define trajectory points or selections.
4. Confirm to generate, and use Axiom's standard undo (Ctrl+Z) if needed.

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Commands

Command	Description
/rm wand	Gives you the RoadMarker Wand tool.
/rm mode <mode>	Switches generation mode (draw, extrude, wall_smooth, border, smooth).
/rm line / /rm bezier / /rm catmull	Sets curve algorithm for draw and extrude modes.
/rm pattern <pos1|pos2|capture|smooth|clear>	Manages 3D road cross-section capture and slope smoothing.
/rm pattern smooth <on|off>	Toggles automatic half-slab slope smoothing during extrusion.
/rm block <block_id>	Manually sets active stair/coral material with auto-complete.
/rm preview	Toggles the particle preview on/off.
/rm undo	Reverts the last placed curve or road operation.
/rm redo	Re-applies the last undone operation.
/rm info	Displays current session status, mode, points, and settings.
/rm samples <n>	Adjusts curve sampling density (default: 3000).
/rm maxBlocks <n>	Safety limit on maximum blocks per operation (default: 50000).

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Modes

Extrude

Captures a 3D road cross-section (lanes, curbs, markings, guardrails) and sweeps it along smooth curves. Automatically adapts to inclines and declines using half-slabs with solid substrate foundations underneath.

Wall Smooth

Smooths stepped vertical cliffs and walls of arbitrary thickness (1, 2, 5, 10+ blocks) into clean ~45° diagonal stair slopes. Uses view-vector orientation to smooth only the side facing the player and includes automatic color-matching for blocks without direct stair equivalents.

Border

Select a 2-point rectangular area. The mod scans the road, detects all road edge blocks bordering the field, and replaces them with matching beveled stairs sloping down into the field while leaving the field 100% untouched.

Smooth

Build any freehand line with regular blocks (e.g. white concrete / quartz), select the area with 2 points, and RoadMarker will trace and convert it into a smooth stair curve.

Curves (Draw)

Place 2 or more control points to draw mathematically smooth subpixel marking curves (bezier, catmull, line) using stairs or coral fans for highway off-ramps, airport taxiways, race tracks, or decorative landscaping.

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Requirements

• Fabric Loader (Minecraft 26.2+)
• Fabric API
• Java 21+
• (Optional) Axiom (if using the RoadMarker-Axiom-Integration companion addon)