Fractal inflationL3DT uses a diamondsquare subdivision fractal algorithm to 'inflate' the heightfield during the design/inflate algorithm. This algorithm upsizes the map by a power of two, and fills in the missing values by linear (or was it cubic?) interpolation, with a fractal perturbation to introduce some noise. The fractal 'persistence' (ie. roughness) of this noise is controlled locally by the interpolated value of the 'Frac' parameter in the design map. Altogether, the inflation routine expands the design map by a factor such as 64 to make the heightfield^{1)} For example, with a design map resolution factor of 64 (the default setting), each design map pixel is converted into a 64×64 block of heightfield pixels. ^{1)}
This factor is set in the design map size wizard.
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