Function build_fields

map.py:507–545

(cfg: Config)

def build_fields(cfg: Config):
    shape = (cfg.rows, cfg.cols)

    cont = noise_field(cfg, 10, cfg.continental_scale, cfg.continental_octaves, cfg.continental_smooth_passes)
    cont = np.clip((cont - 0.22) / 0.78, 0.0, 1.0).astype(np.float32)

    peaks = ridged01(normalize01(fbm(shape, cfg.seed + 20, cfg.peaks_scale, cfg.peaks_octaves, cfg.persistence, cfg.lacunarity)))
    erosion = noise_field(cfg, 30, cfg.erosion_scale, cfg.erosion_octaves, 0)

    ridge_a = fbm_aniso(shape, cfg.seed + 25, cfg.ridge_scale_short, cfg.ridge_scale_long, cfg.ridge_octaves, cfg.persistence, cfg.lacunarity)
    ridge_b = fbm_aniso(shape, cfg.seed + 26, cfg.ridge_scale_long, cfg.ridge_scale_short, cfg.ridge_octaves, cfg.persistence, cfg.lacunarity)
    ridges = smooth_box(np.maximum(ridged01(normalize01(ridge_a)), ridged01(normalize01(ridge_b))), 1)

    humid0 = noise_field(cfg, 40, cfg.humid_scale, cfg.humid_octaves, 0)
    temp0 = noise_field(cfg, 50, cfg.temp_scale, cfg.temp_octaves, 0)

    wx = ((noise_field(cfg, 71, cfg.warp_scale, cfg.warp_octaves, 0) - 0.5) * 2.0 * cfg.warp_amp).astype(np.int32)
    wy = ((noise_field(cfg, 72, cfg.warp_scale, cfg.warp_octaves, 0) - 0.5) * 2.0 * cfg.warp_amp).astype(np.int32)
    humid = warp_int(humid0, wx, wy)
    temp_noise = warp_int(temp0, -wx, wy)

    peaks2 = peaks * (1.0 - cfg.erosion_strength * erosion)
    elev = normalize01(cont + cfg.peaks_strength * peaks2 + cfg.ridge_strength * ridges)

    lat = np.linspace(0.0, 1.0, cfg.rows, dtype=np.float32)
    equator = 1.0 - np.abs(lat * 2.0 - 1.0)

    temp = 0.70 * equator[:, None] + 0.30 * temp_noise
    temp = temp - 0.38 * np.clip(elev - cfg.sea_level, 0.0, 1.0)
    temp = normalize01(temp)

    land = elev >= cfg.sea_level
    dist_to_land = hex_bfs_distance(land)
    dist_to_water = hex_bfs_distance(~land)

    water_influence = np.exp(-dist_to_water.astype(np.float32) / 3.2).astype(np.float32)
    humid2 = normalize01(0.70 * humid + 0.30 * water_influence)

    return elev, peaks, ridges, humid2, temp, equator, land, dist_to_land, dist_to_water


def build_mountains(cfg: Config, land: np.ndarray, elev: np.ndarray, peaks: np.ndarray, ridges: np.ndarray, temp: np.ndarray) -> np.ndarray: