fn calculate_lighting(color: vec3f, normal: vec3f, pos: vec3f, shadow: f32) -> vec3f {
    let light_dir = normalize(vec3f(1.0, 1.0, 1.0));
    let diffuse = max(dot(normal, light_dir), 0.0);
    let lighting = diffuse * (0.1 + 0.9 * shadow) + 0.1; // Ambient + Shadowed Diffuse
    return color * lighting;
}