marss 0.0.3

Mars celestial simulation crate for the MilkyWay SolarSystem workspace
Documentation 
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pub struct SkyState {
    pub sun_elevation_deg: f64,
    pub dust_optical_depth: f64,
}

impl SkyState {
    pub fn new(sun_elevation_deg: f64, dust_optical_depth: f64) -> Self {
        Self {
            sun_elevation_deg,
            dust_optical_depth,
        }
    }

    pub fn zenith_color(&self) -> [f64; 3] {
        if self.sun_elevation_deg < 0.0 {
            return [0.0, 0.0, 0.0];
        }
        let tau = self.dust_optical_depth;
        let elevation_factor = (self.sun_elevation_deg / 90.0).sqrt();
        [
            (0.7 + 0.2 * tau.min(1.0)) * elevation_factor,
            (0.4 + 0.1 * tau.min(1.0)) * elevation_factor,
            (0.25 - 0.05 * tau.min(1.0)).max(0.05) * elevation_factor,
        ]
    }

    pub fn sunset_color(&self) -> [f64; 3] {
        if self.sun_elevation_deg > 10.0 || self.sun_elevation_deg < -5.0 {
            return self.zenith_color();
        }
        [0.15, 0.25, 0.55]
    }

    pub fn horizon_glow(&self) -> f64 {
        if self.sun_elevation_deg < -18.0 {
            return 0.0;
        }
        let factor = ((self.sun_elevation_deg + 18.0) / 28.0).clamp(0.0, 1.0);
        factor * (1.0 - (-self.dust_optical_depth).exp())
    }
}