{
  "_comment": "How a preview is drawn. Nothing here changes a height - two bakes of the same world under two palettes are the same terrain. Point a planet manifest at this file with \"palette\": \"<path relative to the manifest>\"; leave it out and these numbers are used anyway. Keys beginning with an underscore are comments.",

  "_comment_land_stops": "The hypsometric ramp: sea level at t 0 to the top of the land at t 1. The top is a percentile rather than the maximum, so one high summit cannot push a whole continent into the bottom of the ramp.",
  "land_stops": [
    { "t": 0,     "rgb": [72, 106, 68] },
    { "t": 0.08,  "rgb": [104, 132, 74] },
    { "t": 0.2,   "rgb": [142, 152, 88] },
    { "t": 0.38,  "rgb": [164, 148, 104] },
    { "t": 0.58,  "rgb": [150, 128, 106] },
    { "t": 0.75,  "rgb": [138, 130, 128] },
    { "t": 0.88,  "rgb": [176, 174, 174] },
    { "t": 1,     "rgb": [246, 246, 250] }
  ],

  "sea_shallow": [56, 104, 136],
  "sea_deep":    [18, 40, 72],
  "river":       [70, 132, 180],
  "_comment_ice": "Drawn wherever a class is marked snow, whatever height the ground stands at. Not pure white: white has nowhere left to go under the hillshade, so an ice sheet comes out as a flat cut-out with no shape in it at all.",
  "ice":         [232, 238, 245],

  "_comment_top": "Where the top of the hypsometric ramp sits. The percentile is relative to the world being drawn, which is the only way a low continent is legible at all and is also a picture that lies about scale - measured on this planet's central landmass, a 47 m plain whose median slope is 0.6 degrees comes out with the same bare rock and white caps a 2800 m range would, because 40 m is the top of its own ramp. Set land_top_m to a height in metres for an absolute ramp instead; 0 keeps the percentile, and either way the run summary says which ceiling the preview was drawn against.",
  "land_top_percentile": 99.5,
  "land_top_m":          0,

  "_comment_light": "Azimuth is degrees clockwise from north and altitude degrees above the horizon; north-west at 45 is what every DEM hillshade uses. Ambient is how lit the shaded side is - at zero a shadow is a hole - and gain how much the lit side brightens.",
  "sun_azimuth_deg":  315,
  "sun_altitude_deg": 45,
  "ambient": 0.45,
  "gain":    0.75
}