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Added helper function density_factor_by_altitude

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This commit is contained in:
kitswas 2022-08-31 11:29:05 +05:30
parent 91a4a9e187
commit c0911707e5
1 changed files with 15 additions and 0 deletions
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15
world/src/layer/scatter.rs
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@ -1,6 +1,7 @@
use crate::{column::ColumnSample, sim::SimChunk, Canvas, CONFIG};
use common::terrain::{Block, BlockKind, SpriteKind};
use noise::NoiseFn;
use num::traits::Pow;
use rand::prelude::*;
use std::f32;
use vek::*;
@ -9,6 +10,20 @@ pub fn close(x: f32, tgt: f32, falloff: f32) -> f32 {
(1.0 - (x - tgt).abs() / falloff).max(0.0).powf(0.125)
}
/// Returns a decimal value between 0 and 1.
/// The density is maximum at the middle of the highest and the lowest allowed
/// altitudes, and zero otherwise. Quadratic curve.
///
/// The formula used is:
///
/// ```latex
/// \max\left(-\frac{4\left(x-u\right)\left(x-l\right)}{\left(u-l\right)^{2}},\ 0\right)
/// ```
pub fn density_factor_by_altitude(lower_limit: f32, altitude: f32, upper_limit: f32) -> f32 {
let maximum: f32 = (upper_limit - lower_limit).pow(2) / 4.0f32;
(-((altitude - lower_limit) * (altitude - upper_limit)) / maximum).max(0.0)
}
const MUSH_FACT: f32 = 1.0e-4; // To balance things around the mushroom spawning rate
const GRASS_FACT: f32 = 1.0e-3; // To balance things around the grass spawning rate
const DEPTH_WATER_NORM: f32 = 15.0; // Water depth at which regular underwater sprites start spawning