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The Island node lets you draw basic shapes from which entire landmasses can be generated.

To draw an Island, open the editor from the Properties panel and draw your basic island shape. It is best to create coarse, less defined shapes and let the algorithm generate the details for you.

Once the general shape is ready, you can then use smaller brush sizes in both add or subtract mode to refine the coastlines.

When refining the shape, keep your eye on the underlying generated shape instead of your drawing. This will help you follow what changes

Node Properties
BreakageThe amount of breakage along the island bodies. Higher values create larger number of coastal shifts and smaller islands.
ComplexityThe overall complexity of the coastal shapes.
SeedThe randomization pattern or seed for the node's process.