racer-tracer/src/util.rs


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use rand::Rng;

use crate::vec3::Vec3;

pub fn degrees_to_radians(degrees: f64) -> f64 {
    degrees * std::f64::consts::PI / 180.0
}

pub fn random_double() -> f64 {
    let mut rng = rand::thread_rng();
    rng.gen::<f64>()
}

pub fn random_double_range(min: f64, max: f64) -> f64 {
    let mut rng = rand::thread_rng();
    rng.gen_range(min..max)
}

pub fn random_in_unit_disk() -> Vec3 {
    // TODO: This feels not nice
    loop {
        let p = Vec3::new(
            random_double_range(-1.0, 1.0),
            random_double_range(-1.0, 1.0),
            0.0,
        );
        if p.length_squared() >= 1.0 {
            continue;
        }

        return p;
    }
}