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library: core: camera: add ray calculation method

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This commit is contained in:
Bruno BELANYI 2020-03-29 19:16:07 +02:00
parent c7fec074c2
commit b79c94aad9
1 changed files with 20 additions and 0 deletions
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20
pathtracer/src/core/camera.rs
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@ -2,6 +2,8 @@
use super::film::Film;
use crate::{Point, Vector};
use beevee::ray::Ray;
use nalgebra::Unit;
use serde::Deserialize;
/// Represent an abstract camera to observe the scene.
@ -79,6 +81,24 @@ impl Camera {
pub fn origin(&self) -> &Point {
&self.origin
}
/// Get the Ray coming out of the camera at a given ratio on the image.
///
/// # Examples
///
/// ```
/// # use pathtracer::core::Camera;
/// # use pathtracer::Point;
/// #
/// let cam = Camera::default();
/// let ray_ul = cam.ray_with_ratio(0., 0.); // Ray coming out of the upper-left pixel
/// let ray_ul = cam.ray_with_ratio(1., 1.); // Ray coming out of the lower-right pixel
/// ```
pub fn ray_with_ratio(&self, x: f32, y: f32) -> Ray {
let pixel = self.film().pixel_at_ratio(x, y);
let direction = Unit::new_normalize(pixel - self.origin());
Ray::new(pixel, direction)
}
}
impl Default for Camera {