rust_pathtracer/camera/
pinhole.rs

1
2use crate::prelude::*;
3
4/// A traditional pinhole camera with an origin, center and fov.
5pub struct Pinhole {
6    origin          : F3,
7    center          : F3,
8
9    fov             : F,
10}
11
12impl Camera3D for Pinhole {
13
14    fn new() -> Self {
15
16        let origin = F3::new(0.0, 0.0, 3.0);
17        let center = F3::new(0.0, 0.0, 0.0);
18
19        Self {
20            origin,
21            center,
22
23            fov     : 80.0,
24        }
25    }
26
27    fn set(&mut self, origin: F3, center: F3) {
28        self.origin = origin;
29        self.center = center;
30    }
31
32    fn set_fov(&mut self, fov: F) {
33        self.fov = fov;
34    }
35
36
37    #[inline(always)]
38    fn gen_ray(&self, p: F2, offset: F2, width: F, height: F) -> Ray {
39        let ratio = width / height;
40
41        let pixel_size = F2::new( 1.0 / width, 1.0 / height);
42
43        let half_width = (self.fov.to_radians() * 0.5).tan();
44        let half_height = half_width / ratio;
45
46        let up_vector = F3::new(0.0, 1.0, 0.0);
47
48        let w = (self.origin - self.center).normalize();
49        let u = (&up_vector).cross(&w);
50        let v = w.cross(&u);
51
52        let lower_left = self.origin - u.mult_f(&half_width)  - v.mult_f(&half_height) - w;
53        let horizontal = u.mult_f(&(half_width * 2.0));
54        let vertical = v.mult_f(&(half_height * 2.0));
55
56        let mut rd = lower_left - self.origin;
57        rd += horizontal.mult_f(&(pixel_size.x * offset.x + p.x));
58        rd += vertical.mult_f(&(pixel_size.y * offset.y + p.y));
59
60        Ray::new(self.origin, rd.normalize())
61    }
62}
rust_pathtracer/camera/pinhole.rs

rust_pathtracer/camera/
pinhole.rs
