Positional camera

This commit is contained in:
Max Nuding 2022-07-02 06:32:03 +02:00
parent 46ec8663ff
commit 388c48d236
Signed by: phlaym
GPG Key ID: 0AAD39863E09DC48
3 changed files with 111 additions and 61 deletions

View File

@ -4,42 +4,56 @@ pub struct Camera {
aspect_ratio: f64, aspect_ratio: f64,
viewport_height: f64, viewport_height: f64,
viewport_width: f64, viewport_width: f64,
focal_length: f64,
origin: Point3, origin: Point3,
horizontal: Vec3, horizontal: Vec3,
vertical: Vec3, vertical: Vec3,
lower_left_corner: Vec3 lower_left_corner: Vec3,
lens_radius: f64,
u: Vec3,
v: Vec3,
w: Vec3
} }
impl Camera { impl Camera {
pub fn get_ray(&self, u: f64, v: f64) -> Ray { pub fn get_ray(&self, s: f64, t: f64) -> Ray {
let rd = self.lens_radius * Vec3::random_unit_disk();
let offset = self.u * rd.x() + self.v * rd.y();
Ray::new( Ray::new(
self.origin, self.origin + offset,
self.lower_left_corner + u*self.horizontal + v*self.vertical - self.origin) self.lower_left_corner + s*self.horizontal + t*self.vertical - self.origin - offset)
} }
pub fn new(aspect_ratio: f64) -> Self { pub fn new(
let viewport_height = 2.0; look_from: Point3,
look_at: Point3,
up: Vec3,
aspect_ratio: f64,
vfov: f64,
aperture: f64,
focus_dist: f64) -> Self {
let theta = vfov.to_radians();
let h = (theta / 2.0).tan();
let viewport_height = 2.0 * h;
let viewport_width = aspect_ratio * viewport_height; let viewport_width = aspect_ratio * viewport_height;
let origin = Point3::default();
let horizontal = Vec3::new(viewport_width, 0.0, 0.0); let w = (look_from - look_at).unit_vector();
let vertical = Vec3::new(0.0, viewport_height, 0.0); let u = up.cross(&w).unit_vector();
let focal_length = 1.0; let v = w.cross(&u);
let horizontal = focus_dist * viewport_width * u;
let vertical = focus_dist * viewport_height * v;
Camera { Camera {
aspect_ratio, aspect_ratio,
viewport_height, viewport_height,
viewport_width, viewport_width,
focal_length, origin: look_from,
origin,
horizontal, horizontal,
vertical, vertical,
lower_left_corner: origin - horizontal/2.0 - vertical/2.0 - Vec3::new(0.0, 0.0, focal_length) lower_left_corner: look_from - horizontal/2.0 - vertical/2.0 - focus_dist*w,
lens_radius: aperture / 2.0,
u,
v,
w
} }
} }
} }
impl Default for Camera {
fn default() -> Self {
let aspect_ratio = 16.0 / 9.0;
Camera::new(aspect_ratio)
}
}

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@ -8,59 +8,79 @@ use crate::material::{Dielectric, Lambertian, Material, Metal};
mod vec3; mod vec3;
mod ray; mod ray;
mod hittable; mod hittable;
mod camera;
mod material; mod material;
mod camera;
fn random_scene() -> Vec<Box<dyn Hittable>> {
let mut world:Vec<Box<dyn Hittable>> = Vec::new();
let material_ground = Material::Lambertian(Lambertian::new(Color::new(0.5, 0.5, 0.5)));
let ground = Sphere {
center: Point3::new(0.0, -1000.0, 0.0),
radius: 1000.0,
material: material_ground
};
world.push(Box::new(ground));
let unit_range = Uniform::from(0.0..1.0);
let fuzz_range = Uniform::from(0.0..0.5);
let mut rng = rand::thread_rng();
let p = Point3::new(4.0, 0.2, 0.0);
for a in -1..11 {
for b in -11..11 {
let choose_material = unit_range.sample(&mut rng);
let center = Point3::new(
(a as f64) + 0.9*unit_range.sample(&mut rng),
0.2,
(b as f64) + 0.9*unit_range.sample(&mut rng));
if (center - p).length() < 0.9 {
continue;
}
let material = match choose_material {
_ if choose_material < 0.8 => Material::Lambertian(Lambertian::new(
Color::random(0.0, 1.0) * Color::random(0.0, 1.0))),
_ if choose_material < 0.95 => Material::Metal(Metal::new(
Color::random(0.5, 1.0),
fuzz_range.sample(&mut rng))),
_ => Material::Dielectric(Dielectric::new(1.5)),
};
let sphere = Box::new(Sphere {
center,
radius: 0.2,
material
});
world.push(sphere);
}
}
world
}
fn main() { fn main() {
// Image // Image
const ASPECT_RATIO: f64 = 16.0 / 9.0; const ASPECT_RATIO: f64 = 3.0 / 2.0;
const IMAGE_WIDTH: i32 = 400; const IMAGE_WIDTH: i32 = 1200;
const IMAGE_HEIGHT: i32 = (IMAGE_WIDTH as f64 / ASPECT_RATIO) as i32; const IMAGE_HEIGHT: i32 = (IMAGE_WIDTH as f64 / ASPECT_RATIO) as i32;
const SAMPLES_PER_PIXEL: i32 = 10; const SAMPLES_PER_PIXEL: i32 = 10;
const MAX_DEPTH: i32 = 50; const MAX_DEPTH: i32 = 50;
let look_from = Point3::new(13.0, 2.0, 3.0);
let look_at = Point3::new(0.0, 0.0, 0.0);
let focus_dist = 10.0;
// Camera // Camera
let cam = Camera::new(ASPECT_RATIO); let cam = Camera::new(
look_from,
look_at,
Vec3::new(0.0, 1.0, 0.0),
ASPECT_RATIO,
20.0,
0.1,
focus_dist);
// World // World
let mut world:Vec<Box<dyn Hittable>> = Vec::new(); let world= random_scene();
let center = Box::new(Sphere {
center: Point3::new(0.0, 0.0, -1.0),
radius: 0.5,
material: Material::Lambertian(Lambertian::new(Color::new(0.7, 0.3, 0.3)))
});
let center_glass = Box::new(Sphere {
center: Point3::new(0.0, 0.0, -1.0),
radius: 0.5,
material: Material::Dielectric(Dielectric::new(1.5))
});
world.push(center_glass);
let ground = Sphere {
center: Point3::new(0.0, -100.5, -1.0),
radius: 100.0,
material: Material::Lambertian(Lambertian::new(Color::new(0.8, 0.8, 0.0)))
};
world.push(Box::new(ground));
let left = Box::new(Sphere {
center: Point3::new(-1.0, 0.0, -1.0),
radius: 0.5,
material: Material::Metal(Metal::new(Color::new(0.8, 0.8, 0.8), 0.3))
});
let left_glass = Box::new(Sphere {
center: Point3::new(-1.0, 0.0, -1.0),
radius: 0.5,
material: Material::Dielectric(Dielectric::new(1.5))
});
world.push(left_glass);
let right = Box::new(Sphere {
center: Point3::new(1.0, 0.0, -1.0),
radius: 0.5,
material: Material::Metal(Metal::new(Color::new(0.8, 0.6, 0.2), 1.0))
});
world.push(right);
println!("P3\n{} {}\n255", IMAGE_WIDTH, IMAGE_HEIGHT); println!("P3\n{} {}\n255", IMAGE_WIDTH, IMAGE_HEIGHT);
let between = Uniform::from(0.0..1.0); let between = Uniform::from(0.0..1.0);
let mut rng = rand::thread_rng(); let mut rng = rand::thread_rng();
for j in (0..IMAGE_HEIGHT).rev() { for j in (0..IMAGE_HEIGHT).rev() {
@ -72,6 +92,9 @@ fn main() {
let u = (i as f64 + random_number) / (IMAGE_WIDTH - 1) as f64; let u = (i as f64 + random_number) / (IMAGE_WIDTH - 1) as f64;
let v = (j as f64 + random_number) / (IMAGE_HEIGHT - 1) as f64; let v = (j as f64 + random_number) / (IMAGE_HEIGHT - 1) as f64;
let ray = cam.get_ray(u, v); let ray = cam.get_ray(u, v);
if i == 200 && (j == 112 || j == 113) {
let tt = 0;
}
color += ray.pixel_color(&world, MAX_DEPTH); color += ray.pixel_color(&world, MAX_DEPTH);
} }
color.write_color(SAMPLES_PER_PIXEL); color.write_color(SAMPLES_PER_PIXEL);

View File

@ -63,6 +63,19 @@ impl Vec3 {
} }
} }
pub fn random_unit_vector() -> Self { Vec3::random_in_unit_sphere().unit_vector() } pub fn random_unit_vector() -> Self { Vec3::random_in_unit_sphere().unit_vector() }
pub fn random_unit_disk() -> Self {
let between = Uniform::from(-1.0..1.0);
let mut rng = rand::thread_rng();
loop {
let v = Vec3::new(
between.sample(&mut rng),
between.sample(&mut rng),
0.0);
if v.length_squared() < 1.0 {
return v;
}
}
}
pub fn near_zero(&self) -> bool { pub fn near_zero(&self) -> bool {
const MAXIMUM_DISTANCE_FROM_ZERO:f64 = 1e-8; const MAXIMUM_DISTANCE_FROM_ZERO:f64 = 1e-8;
self.x.abs() < MAXIMUM_DISTANCE_FROM_ZERO && self.x.abs() < MAXIMUM_DISTANCE_FROM_ZERO &&