Weight of the grid tensors (straight, perpendicular streets).
Main grid orientation, degrees from +x.
Size of each grid patch's area of influence, as a fraction of the settlement radius.
Extra grid patches with their own orientation (neighbourhoods laid out at different angles).
Largest angle (degrees) a grid patch turns away from gridAngle.
Angular noise, degrees: 0 = crisp geometry, 30+ = organic, winding streets.
Size of the noise features, metres.
Weight of the radial tensor around the centre (ring roads and spokes).
Reach of the radial tensor, as a fraction of the settlement radius.
Weight of terrain-following tensors (streets along contours and coastlines).
Slope (rise/run) at which terrain alignment reaches full weight.
How street directions are chosen (Chen et al. 2008, "Interactive Procedural Street Modeling"). The field is a weighted sum of basis tensors; roads follow its major or minor eigenvector.