Guide Long Idland

What Long Idland Actually Is and How People Use It

Long Idland is a terrain generation tool that some game developers and world-builders rely on for creating large-scale procedural landscapes. It sits somewhere between a standalone editor and a plugin, depending on which pipeline you are using. I first ran into it when a client needed a mountain range that stretched over 40 kilometers with coherent geology, and standard heightmap exporters were not cutting it. The tool handles elevation, erosion simulation, and biome distribution in a single pass, which is why people keep reaching for it. You can grab the latest release from the official repository at longidland.io/download. Grab the version that matches your target engine. The installer is about 340 megabytes and takes roughly ten minutes on a decent connection. Once installed, you will be greeted by a dark interface with a grid editor on the left and a preview viewport on the right. It is not the prettiest UI I have seen, but it gets the job done without lag on older hardware. The workflow starts with setting your region bounds. Enter the tile count along the X and Z axes, then hit Generate Base Terrain. The tool produces a raw heightmap first, then runs optional smoothing passes. I usually leave the smoothing at Level 2 and let the erosion stage handle the rest. Skipping erosion entirely makes everything look plastic. That is a mistake beginners make constantly.

Advanced Workflow and Edge Cases

Here is where things get complicated. Long Idland uses a layered noise system called ridged multi-fractal blending, which gives you fine control over ridge patterns and valley depth. The catch is that the default seed values tend to repeat certain features every few thousand meters. I discovered this when a playtester pointed out that a river delta in sector 7 looked identical to one in sector 3 on the same map. It was the same seed cluster, just shifted. The workaround I settled on was splitting the terrain into overlapping chunks and assigning each chunk a unique noise offset before generating. You set this under the Region > Chunk Settings menu. Offset values between 1.0 and 50.0 per axis work well. It adds maybe five minutes to the build time but eliminates the repetition problem entirely. I also found that exporting the heightmap as a 32-bit PNG instead of a 16-bit TIFF preserves more detail in steep cliff faces, though the file sizes balloon from around 80 megabytes to over 400 megabytes for a 16k by 16k region. Another nuance that trips people up is the vegetation layer. Long Idland does not place individual trees. It generates density masks based on elevation and moisture values, then hands those masks off to your engine's native foliage system. If your engine cannot read the mask format, vegetation appears blank or in wrong biomes. I had this happen with a Unity export where the mask was stamped in OpenEXR and the engine only supported 16-bit half floats. Switching the export preset to Raw Float Texture fixed it in about two minutes.

When Long Idland Falls Apart

Do not expect this tool to solve every problem. It struggles with karst landscapes, cave systems, and anything that requires fractal self-similarity below the meter scale. If you need detailed underground networks, you will need to supplement it with a separate cave generation tool or hand-place those features later. The same goes for coastal erosion patterns near water bodies. The shoreline simulation is basic and tends to over-smooth deltas and estuaries. If your project requires that level of hydrological accuracy, consider pairing Long Idland with a tool like WorldMachine or using a heightfield-based sculpting workflow after the initial generation. I have tried running Long Idland outputs through Gaea for secondary refinement, and the results are decent, but the export-import cycle adds about twenty minutes per region. That is a real cost when you are iterating fast. The tool also does not play nicely with real-time editing. Once you generate a region, changing a parameter means regenerating from scratch unless you lock the noise layers. There is no incremental update mode, and the developer has said in forum threads that implementing one would require a full rewrite of the core engine. So plan your iterations ahead of time and save multiple versions of your settings rather than trying to tweak live.

Practical Tips From Experience

Keep your chunk size at 4096 by 4096 units or smaller for best performance. Larger chunks will choke the GPU during erosion passes and can crash the application on machines with less than 16 gigabytes of RAM. I learned that the hard way on a machine with 12 gigs during a deadline push. The export stalled at 67 percent and then threw an out-of-memory error. Dropping to smaller chunks solved it immediately. Use the Region > Save Noise Profile feature after you dial in a setting you like. It saves a JSON file that you can reload on future projects. This cuts setup time for similar terrain types down to under three minutes compared to rebuilding everything from scratch each time. Finally, back up your generated heightmaps before running any post-processing filters. The erosion and weathering effects are destructive and irreversible within the tool. There is no undo history beyond the last ten actions, which disappears on a restart. I keep a folder structure organized by date and seed number, and it has saved me more than once when a filter ruined a region that took an hour to generate.