rustray/src/ray.rs

use cgmath::Vector3;

pub struct Ray {
    pub origin: Vector3<f32>,
    pub direction: Vector3<f32>,
    pub inv_direction: Vector3<f32>,
    pub signs: Vector3<usize>,
}

impl Ray {
    pub fn new(origin: Vector3<f32>, direction: Vector3<f32>) -> Ray {
        let inv_direction = 1.0 / direction;

        let x = (inv_direction.x < 0.0) as usize;
        let y = (inv_direction.y < 0.0) as usize;
        let z = (inv_direction.z < 0.0) as usize;

        Ray {
            origin,
            direction,
            inv_direction,
            signs: Vector3::new(x, y, z),
        }
    }
}