What this tool does
It builds a 3D level from a seed. The same seed and settings always give the same map, so you can share a seed or save it in your game and rebuild the world at runtime. There are three kinds of map. Terrain is a heightmap world with hills, mountains, beaches and water, worn down by simulated rain so valleys and ridges look natural. Dungeon is a grid of rooms and corridors with real walls, pillars, chests, torches, a start and an exit. Voxel island is a block world like Minecraft, with grass, sand, stone, snow and blocky trees.
How the terrain is made
Layers of simplex noise make the base shape. Island shapes fade the edges into the sea, and mountains use ridged noise for sharp peaks. Then thousands of virtual rain drops run downhill, carry soil away and drop it lower, which carves gullies and smooth valleys. Terraces turn slopes into steps, which is handy for strategy games and farming games. Colours come from height, slope and a moisture map: sand at the shore, grass and forest in the middle, rock on steep slopes and snow on top.
Using it in Godot
Drop map.glb into your project. Meshes named with the -col suffix, such as terrain-col, get a collision body on import, so the player can walk on them right away. The markers spawn and spot_1 are empty nodes in the scene, so read their positions to place the player and towns. To use your own trees, untick the props box, add gsk_map_props.gd to a node, point it at props.json and fill in a scene for each prop type. If the colours look white, open the material and turn on Vertex Color, Use as Albedo.
Using it in Unity
For a Unity Terrain, create a terrain, open its settings, choose Import Raw and pick heightmap_16bit.raw. Use 16 bit, Windows byte order, the resolution and the size written in README.txt. Then paint the terrain layers with splat_rgb.png as a guide. GskMapProps.cs reads props.json and places your prefabs on the terrain by their map position and the terrain height. For dungeons and voxel maps, import map.glb with glTFast and add Mesh Colliders.
Is anything uploaded?
No. The map is made in your browser.