earths 0.0.1

High-fidelity Earth simulation engine — orbit, atmosphere, geology, hydrology, biosphere, terrain, lighting, rendering, satellites, and temporal systems with full scientific coupling
Documentation 
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use sciforge::hub::prelude::constants::elements::{atomic_mass, electronegativity};
#[derive(Debug, Clone)]
pub struct PbrMaterial {
    pub albedo: [f32; 4],
    pub roughness: f32,
    pub metallic: f32,
    pub normal_strength: f32,
    pub emissive: [f32; 3],
}
fn metallic_from_iron(fe_wt_frac: f64) -> f32 {
    let m_fe = atomic_mass(26);
    let m_o = atomic_mass(8);
    let fe_fraction_in_feo = m_fe / (m_fe + m_o);
    let pure_fe = fe_wt_frac * fe_fraction_in_feo;
    let en = electronegativity(26).unwrap_or(1.83);
    let metallic_scale = (1.0 - en / 4.0).max(0.0);
    (pure_fe * metallic_scale).clamp(0.0, 1.0) as f32
}
impl PbrMaterial {
    pub fn ocean() -> Self {
        Self {
            albedo: [0.01, 0.03, 0.08, 1.0],
            roughness: 0.05,
            metallic: 0.02,
            normal_strength: 1.0,
            emissive: [0.0; 3],
        }
    }
    pub fn grassland() -> Self {
        Self {
            albedo: [0.12, 0.36, 0.08, 1.0],
            roughness: 0.85,
            metallic: 0.0,
            normal_strength: 0.8,
            emissive: [0.0; 3],
        }
    }
    pub fn desert() -> Self {
        let _si_en = electronegativity(14).unwrap_or(1.90);
        Self {
            albedo: [0.76, 0.60, 0.36, 1.0],
            roughness: 0.95,
            metallic: metallic_from_iron(0.02),
            normal_strength: 0.6,
            emissive: [0.0; 3],
        }
    }
    pub fn snow() -> Self {
        Self {
            albedo: [0.95, 0.95, 0.97, 1.0],
            roughness: 0.3,
            metallic: 0.0,
            normal_strength: 0.3,
            emissive: [0.0; 3],
        }
    }
    pub fn rock() -> Self {
        Self {
            albedo: [0.35, 0.30, 0.25, 1.0],
            roughness: 0.9,
            metallic: metallic_from_iron(0.02),
            normal_strength: 1.0,
            emissive: [0.0; 3],
        }
    }
    pub fn volcanic() -> Self {
        Self {
            albedo: [0.15, 0.08, 0.05, 1.0],
            roughness: 0.7,
            metallic: metallic_from_iron(0.10),
            normal_strength: 1.0,
            emissive: [0.8, 0.2, 0.0],
        }
    }
    pub fn forest() -> Self {
        let _mg_mass = atomic_mass(12);
        Self {
            albedo: [0.05, 0.20, 0.02, 1.0],
            roughness: 0.9,
            metallic: 0.0,
            normal_strength: 0.9,
            emissive: [0.0; 3],
        }
    }
    pub fn ice() -> Self {
        Self {
            albedo: [0.70, 0.85, 0.92, 0.85],
            roughness: 0.1,
            metallic: 0.04,
            normal_strength: 0.5,
            emissive: [0.0; 3],
        }
    }
}