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69 lines
2.9 KiB
Rust
69 lines
2.9 KiB
Rust
pub struct Config {
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pub sea_level: f32,
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pub mountain_scale: f32,
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pub snow_temp: f32,
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pub temperate_temp: f32,
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pub tropical_temp: f32,
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pub desert_temp: f32,
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pub desert_hum: f32,
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pub forest_hum: f32,
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pub jungle_hum: f32,
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/// Rainfall (in meters) per m² of surface per minute. Default is set to
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/// make it approximately 1 m rainfall / year uniformly across the whole
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/// land area, which is the average rainfall on Earth.
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pub rainfall_chunk_rate: f32,
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/// Roughness coefficient is an empirical value that controls the rate of
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/// energy loss of water in a river. The higher it is, the more water
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/// slows down as it flows downhill, which consequently leads to lower
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/// velocities and higher river area for the same flow rate.
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///
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/// See https://wwwrcamnl.wr.usgs.gov/sws/fieldmethods/Indirects/nvalues/index.htm.
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///
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/// The default is set to over 0.06, which is pretty high but still within a
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/// reasonable range for rivers. The higher this is, the quicker rivers
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/// appear, and since we often will have high slopes we want to give
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/// rivers as much of a chance as possible. In the future we can set
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/// this dynamically.
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///
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/// NOTE: The values in the link are in seconds / (m^(-1/3)), but we use
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/// them without conversion as though they are in minutes / (m^(-1/3)).
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/// The idea here is that our clock speed has time go by at
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/// approximately 1 minute per second, but since velocity depends on
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/// this parameter, we want flow rates to still "look" natural at the second
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/// level. The way we are cheating is that we still allow the refill
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/// rate (via rainfall) of rivers and lakes to be specified as though
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/// minutes are *really* minutes. This reduces the amount of water
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/// needed to form a river of a given area by 60, but hopefully this should
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/// not feel too unnatural since the refill rate is still below what
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/// people should be able to perceive.
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pub river_roughness: f32,
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/// Maximum width of rivers, in terms of a multiple of the horizontal chunk
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/// size.
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///
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/// Currently, not known whether setting this above 1.0 will work properly.
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/// Please use with care!
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pub river_max_width: f32,
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/// Minimum height at which rivers display.
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pub river_min_height: f32,
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/// Rough desired river width-to-depth ratio (in terms of horizontal chunk
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/// width / m, for some reason). Not exact.
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pub river_width_to_depth: f32,
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}
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pub const CONFIG: Config = Config {
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sea_level: 140.0,
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mountain_scale: 2048.0,
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snow_temp: -0.8,
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temperate_temp: -0.4,
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tropical_temp: 0.4,
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desert_temp: 0.8,
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desert_hum: 0.15,
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forest_hum: 0.5,
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jungle_hum: 0.85,
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rainfall_chunk_rate: 1.0 / (512.0 * 32.0 * 32.0),
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river_roughness: 0.06125,
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river_max_width: 2.0,
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river_min_height: 0.25,
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river_width_to_depth: 1.0,
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};
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