Docs/Terrain

Road Creation

Build spline-based roads that conform to terrain surfaces.

14 min read Intermediate Updated 2026-07-01 v2.0 ~43 min to complete

Introduction

Roads connect your game world. This guide covers creating spline-based roads that follow terrain contours, with proper texturing and intersection handling.

Guide 3 of 25

This is part of the Intermediate Guides collection. Category: Terrain. Estimated completion: 43 minutes. Difficulty: Intermediate.

Screenshot

Step-by-Step Guide

Create a road spline

Add a Spline object. Click on the terrain to add control points — the road follows the spline path.

Conform to terrain

Enable Snap to Terrain so the road follows ground elevation. Set an offset (0.1m) to prevent Z-fighting.

Set road width

Configure width: 8m for highways, 4m for country roads, 2m for paths.

Apply road material

Assign a road texture. Use tiling along the spline length for consistent markings.

Add road markings

Create a second material lane for center lines. Use alpha blending for painted lines.

Handle intersections

Create flat intersection meshes at crossings. Blend materials at edges for smooth transitions.

FluxScript Example

Here is a complete FluxScript implementation for this guide:

Road Creation — FluxScript

on start {
  points = [vec3(0,0,0), vec3(20,0,10), vec3(40,0,15), vec3(60,0,30), vec3(80,0,50)]
  road = world.createSpline(points)
  road.setWidth(6)
  road.setTerrainSnap(true)
  road.setTerrainOffset(0.1)
  road.setMaterial("asphalt")
  road.setTiling(1, 10)
  markings = road.addOverlay("center_line")
  markings.setMaterial("road_markings")
  markings.setWidth(0.3)
  markings.setDash(3, 5)
  road.setLOD([{ distance: 50, segments: 32 }, { distance: 150, segments: 8 }])
  road.rebuild()
}

Node Graph Example

Prefer visual programming? Here is the equivalent Node Graph:

Road Creation — Node Graph

[On Start] --> [Define: 5 waypoints]
   --> [Create Spline] --> [Set Width: 6m, Snap: true]
   --> [Set Material: asphalt, Tiling: (1,10)]
   --> [Add Overlay: center_line, dashed]
   --> [Set LOD: 2 levels] --> [Rebuild]

Optimization Tips

Keep your implementation fast and efficient with these optimization tips:

Use LOD for road segments. Distant sections can use fewer spline subdivisions without visible quality loss.
Keep road splines simple — fewer control points means smoother curves and faster generation.
Snap roads to terrain with a small offset (0.05-0.1m) to prevent Z-fighting.
Pool road segment meshes if generating dynamically to avoid GC spikes.