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docs/nodes/Fractal Interpolation.md

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+# Fractal Interpolation
+
+Fill masked regions using fractal interpolation. Matches the spectral characteristics of the surrounding surface to produce natural-looking infill that preserves texture. Better than Laplace for rough surfaces. Equivalent to Gwyddion's fraccor.c module.
+
+## Inputs
+
+| Name | Type | Required | Description |
+|------|------|----------|-------------|
+| field | DATA_FIELD | Yes | Input field with regions to fill |
+| mask | IMAGE | Yes | Binary mask where white (255) marks pixels to interpolate |
+
+## Outputs
+
+| Name | Type | Description |
+|------|------|-------------|
+| filled | DATA_FIELD | Field with masked regions filled by fractal interpolation |
+
+## Controls
+
+| Name | Type | Default | Description |
+|------|------|---------|-------------|
+| iterations | INT | 200 | Number of boundary relaxation iterations (10–5000) |
+
+## Notes
+
+- Fractal interpolation synthesizes fill data whose power spectrum matches the surrounding surface. This produces a more realistic appearance than Laplace interpolation for textured or rough surfaces.
+- The fill region boundaries are smoothed via relaxation to ensure continuity.
+- For very smooth surfaces, Laplace Interpolation may produce cleaner results.
+- The seed for random synthesis is fixed for reproducibility.