Combine island seeds
A single island is just the start. Crucible lets you combine multiple islands into one map, so you can build archipelagos, multi-landmass layouts, connected continents and more complex terrain without sculpting it by hand. Each island carries its own seed and slider settings, so you can mix different terrain styles in one map.
How does combining island seeds work?
Section titled “How does combining island seeds work?”- Add islands: click to add another island to your map, or press N. Each island gets its own seed, and you can randomize or paste a saved seed to create its terrain independently.
- Select islands: double-click an island to select it and edit its sliders independently. Hold Ctrl (or Shift) and click more islands to add or remove them from the selection, then move, rotate, scale, randomize, or delete them all together. Press Ctrl+A to select every island. Click in the water to deselect, or press Escape.
- Customize each island: each island has its own full set of sliders (landmass, mountains, buildable ground, cliffs, etc.), so you can make a rugged mountain island next to a flat prairie island, or mix any terrain styles you want.
- Position and rotate: drag each island to position it on your map, and spin it to rotate the coastline to face any direction.
- Terrain scales automatically: terrain height and noise scale with the island size and your map size, tuned around Rust’s procedural generation so the result feels natural in game. Blending happens automatically where islands touch.
- Set your map size first: choose your world size before adding islands, then place islands within it. This ensures all terrain scales correctly to your map.
- Mix island sizes and styles: combine a few larger landmasses with smaller ones for natural variety. A big continent with tiny islands nearby feels more organic than uniform-sized landmasses.
- Drop saved seeds onto your map: open the seed gallery and click a saved seed to add its island (or a whole saved group) to your current map, without disturbing the islands you already placed. To replace just one island instead, select it first and use the seed’s Swap button. To start a fresh map from the seed, use Replace all. A merged group keeps its layout and lands selected, so you can drag it straight into place. See seed files.
- Save part or all of the layout: a seed saves whatever islands you have selected. Select one island (or a group) to save just that, or Select All (Ctrl+A) to store the entire multi-island setup as one seed file. Later, add that seed to drop the saved islands (with their positions, rotations, and slider settings) into any map, or use Replace all to recreate it as a fresh map. Share with other map makers, or reuse the layout across projects.
- Live preview helps: use the 3D and 2D preview to check how islands blend together and how the overall map layout feels before exporting.
A top-down view shows the layout clearly, with each island as its own landmass:
When the layout looks right in the 3D preview, export it and bring it into RustEdit.