Unity-OpenHeightmap

OpenHeightmap

A free Unity editor tool for generating terrain heightmaps. Pick a preset or set up the noise yourself, see the result in a live preview, then export it or apply it straight to a scene terrain.

Features

• 6 noise types: Perlin, Simplex, Voronoi, Worley, Value and Midpoint Displacement
• Erosion: hydraulic (droplet-based) and thermal
• 10 presets: from Rolling Hills to Volcanic, each with a suggested terrain height and splatmap colors
• Splatmaps: terrain layers painted by height and slope
• Apply to Terrain: updates the scene terrain, or creates a correctly sized one
• Export: 16-bit PNG, RAW16 or EXR

Requirements

• Unity 6 or newer (URP)

Installation

1. Download or clone this Repository.
2. Copy the Assets/OpenHeightmap folder into your project’s Assets folder.
3. Open the tool from Tools > OpenHeightmap (Ctrl+Alt+H).

Quick Start

1. Choose a preset in the Presets tab and click Apply Preset.
2. Click Generate.
3. Click Apply to Terrain, or Export to save the heightmap.

Generated terrains are saved to Assets/OpenHeightmap Generated, outside the tool folder, so updating the tool never touches them.

Documentation

Full documentation, covering every setting, preset and the API, is included with the tool: Assets/OpenHeightmap/Documentation/Index.html (open it in your browser).

• Read Online

Previews

See the Previews folder for a rendered image of every preset.

Companion Tool

OpenStamper layers craters, ridges, rivers and more onto your heightmaps. It requires OpenHeightmap.

License

MIT. See LICENSE.

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