venuss 0.0.3

Venus 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 basaltic_plain() -> PbrMaterial {
    PbrMaterial {
        name: "basaltic_plain",
        albedo: [0.45, 0.32, 0.18, 1.0],
        roughness: 0.9,
        metallic: 0.03,
        normal_strength: 1.0,
        emissive: [0.0; 3],
        ior: 1.58,
        subsurface: 0.0,
    }
}

pub fn tessera_highland() -> PbrMaterial {
    PbrMaterial {
        name: "tessera_highland",
        albedo: [0.58, 0.46, 0.28, 1.0],
        roughness: 0.95,
        metallic: 0.02,
        normal_strength: 1.2,
        emissive: [0.0; 3],
        ior: 1.55,
        subsurface: 0.0,
    }
}

pub fn volcanic_flow() -> PbrMaterial {
    PbrMaterial {
        name: "volcanic_flow",
        albedo: [0.18, 0.10, 0.06, 1.0],
        roughness: 0.75,
        metallic: 0.08,
        normal_strength: 1.4,
        emissive: [0.04, 0.01, 0.0],
        ior: 1.60,
        subsurface: 0.0,
    }
}

pub fn weathered_plain() -> PbrMaterial {
    PbrMaterial {
        name: "weathered_plain",
        albedo: [0.52, 0.38, 0.22, 1.0],
        roughness: 0.92,
        metallic: 0.01,
        normal_strength: 0.8,
        emissive: [0.0; 3],
        ior: 1.50,
        subsurface: 0.0,
    }
}

pub fn all_venus() -> [PbrMaterial; 4] {
    [
        basaltic_plain(),
        tessera_highland(),
        volcanic_flow(),
        weathered_plain(),
    ]
}