toby/worlds-history-sim-rs
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Tweak rainfall generation

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7b641b5f701f22c12f736398d65ffdecab07bcd9
This commit is contained in:
Tobias Berger 2022-09-05 21:29:27 +02:00
parent 2979b66351
commit f4cf1b4463
Signed by: toby
GPG key ID: 2D05EFAB764D6A88
1 changed files with 30 additions and 13 deletions
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43
save/src/world.rs
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@ -76,6 +76,7 @@ pub struct TerrainCell {
pub altitude: f32,
pub rainfall: f32,
pub rain_accumulated: f32,
pub previous_rain_accumulated: f32,
}
impl World {
@ -280,19 +281,33 @@ impl World {
}
fn generate_rainfall_alt(&mut self) -> Result<(), CartesianError> {
let max_cycles = self.width;
let max_cycles = self.width / 5;
const ACCUMULATED_RAIN_FACTOR: f32 = 0.002;
const RAINFALL_FACTOR: f32 = 0.025;
const ACCUMULATED_RAIN_FACTOR: f32 = 0.06;
const RAINFALL_FACTOR: f32 = 0.005;
const RAINFALL_ALTITUDE_FACTOR: f32 = 0.05;
for _ in 0..max_cycles {
for x in 0..self.width {
let prev_x = (x + 1) % self.width;
let mut prev_x = (x - 1 + self.width) % self.width;
for y in 0..self.height {
let prev_y = if y < self.height / 4 {
prev_x = (x + 1) % self.width;
y + 1
} else if y < self.height / 2 {
y - 1
} else if y < (self.height * 3) / 4 {
prev_x = (x + 1) % self.width;
y + 1
} else {
y - 1
};
let width_factor = f32::sin(PI * y as f32 / self.height as f32);
let mut cell = self.terrain[y as usize][x as usize];
cell.previous_rain_accumulated = cell.rain_accumulated;
cell.rain_accumulated = 0.0;
if cell.altitude <= 0.0 {
@ -300,20 +315,22 @@ impl World {
width_factor * ACCUMULATED_RAIN_FACTOR * Self::MAX_RAINFALL;
}
let prev_cell = self.terrain[y as usize][prev_x as usize];
let prev_cell = self.terrain[prev_y as usize][prev_x as usize];
let altitude_difference = f32::max(
let altitude_difference =
f32::max(0.0, cell.altitude) - f32::max(0.0, prev_cell.altitude);
let altitude_factor = f32::max(
0.0,
f32::max(0.0, cell.altitude) - f32::max(0.0, prev_cell.altitude),
);
let final_rain_factor = f32::min(
0.1,
RAINFALL_FACTOR + (altitude_difference / Self::MAX_ALTITUDE) * 0.1,
RAINFALL_ALTITUDE_FACTOR * altitude_difference / Self::MAX_ALTITUDE,
);
let final_rain_factor = f32::min(1.0, RAINFALL_FACTOR + altitude_factor);
cell.rain_accumulated += prev_cell.previous_rain_accumulated;
cell.rain_accumulated =
f32::min(cell.rain_accumulated, Self::MAX_RAINFALL / RAINFALL_FACTOR);
cell.rain_accumulated += prev_cell.rain_accumulated;
let rain_accumulated = cell.rain_accumulated * final_rain_factor;
cell.rainfall += rain_accumulated / (width_factor + 0.001);
cell.rainfall += rain_accumulated;
cell.rain_accumulated -= rain_accumulated;
cell.rain_accumulated = f32::max(cell.rain_accumulated, 0.0);