marss 0.0.3

Mars celestial simulation crate for the MilkyWay SolarSystem workspace
Documentation 
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#[derive(Debug, Clone)]
pub struct PbrMaterial {
    pub name: &'static str,
    pub albedo: [f32; 4],
    pub roughness: f32,
    pub metallic: f32,
    pub normal_strength: f32,
    pub emissive: [f32; 3],
    pub ior: f32,
    pub subsurface: f32,
}

impl PbrMaterial {
    pub fn fresnel_r0(&self) -> f64 {
        let n = self.ior as f64;
        let r = (n - 1.0) / (n + 1.0);
        r * r
    }
}

pub fn regolith() -> PbrMaterial {
    PbrMaterial {
        name: "regolith",
        albedo: [0.45, 0.22, 0.12, 1.0],
        roughness: 0.9,
        metallic: 0.0,
        normal_strength: 1.0,
        emissive: [0.0; 3],
        ior: 1.50,
        subsurface: 0.0,
    }
}

pub fn bright_dust() -> PbrMaterial {
    PbrMaterial {
        name: "bright_dust",
        albedo: [0.55, 0.35, 0.15, 1.0],
        roughness: 0.95,
        metallic: 0.0,
        normal_strength: 0.5,
        emissive: [0.0; 3],
        ior: 1.50,
        subsurface: 0.1,
    }
}

pub fn dark_dune() -> PbrMaterial {
    PbrMaterial {
        name: "dark_dune",
        albedo: [0.08, 0.06, 0.05, 1.0],
        roughness: 0.7,
        metallic: 0.05,
        normal_strength: 1.2,
        emissive: [0.0; 3],
        ior: 1.52,
        subsurface: 0.0,
    }
}

pub fn basalt() -> PbrMaterial {
    PbrMaterial {
        name: "basalt",
        albedo: [0.12, 0.10, 0.09, 1.0],
        roughness: 0.6,
        metallic: 0.08,
        normal_strength: 1.5,
        emissive: [0.0; 3],
        ior: 1.58,
        subsurface: 0.0,
    }
}

pub fn water_ice() -> PbrMaterial {
    PbrMaterial {
        name: "water_ice",
        albedo: [0.80, 0.85, 0.90, 1.0],
        roughness: 0.3,
        metallic: 0.0,
        normal_strength: 0.3,
        emissive: [0.0; 3],
        ior: 1.31,
        subsurface: 0.6,
    }
}

pub fn co2_ice() -> PbrMaterial {
    PbrMaterial {
        name: "co2_ice",
        albedo: [0.70, 0.72, 0.75, 1.0],
        roughness: 0.2,
        metallic: 0.0,
        normal_strength: 0.2,
        emissive: [0.0; 3],
        ior: 1.41,
        subsurface: 0.5,
    }
}

pub fn sulfate_salt() -> PbrMaterial {
    PbrMaterial {
        name: "sulfate_salt",
        albedo: [0.60, 0.58, 0.45, 1.0],
        roughness: 0.8,
        metallic: 0.0,
        normal_strength: 0.8,
        emissive: [0.0; 3],
        ior: 1.48,
        subsurface: 0.0,
    }
}

pub fn volcanic_summit() -> PbrMaterial {
    PbrMaterial {
        name: "volcanic_summit",
        albedo: [0.06, 0.05, 0.04, 1.0],
        roughness: 0.5,
        metallic: 0.1,
        normal_strength: 2.0,
        emissive: [0.002, 0.0005, 0.0],
        ior: 1.60,
        subsurface: 0.0,
    }
}

pub fn all_mars() -> [PbrMaterial; 8] {
    [
        regolith(),
        bright_dust(),
        dark_dune(),
        basalt(),
        water_ice(),
        co2_ice(),
        sulfate_salt(),
        volcanic_summit(),
    ]
}