46 lines
1.2 KiB
Rust
46 lines
1.2 KiB
Rust
use anyhow::Result;
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use rtchallenge::{
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canvas::Canvas,
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matrices::Matrix4x4,
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rays::Ray,
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spheres::{intersect, Sphere},
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tuples::{Color, Tuple},
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Float,
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};
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fn main() -> Result<()> {
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let w = 200;
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let h = w;
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let bg = Color::new(0.2, 0.2, 0.2);
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let mut c = Canvas::new(w, h, bg);
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let ray_origin = Tuple::point(0., 0., -5.);
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let wall_z = 10.;
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let wall_size = 7.;
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let pixel_size = wall_size / w as Float;
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let half = wall_size / 2.;
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let color = Color::new(1., 0., 0.);
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let mut shape = Sphere::default();
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shape.set_transform(
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Matrix4x4::shearing(1., 0., 0., 0., 0., 0.) * Matrix4x4::scaling(0.5, 1., 1.0),
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);
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for y in 0..h {
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let world_y = half - pixel_size * y as Float;
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for x in 0..w {
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let world_x = -half + pixel_size * x as Float;
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let position = Tuple::point(world_x, world_y, wall_z);
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let r = Ray::new(ray_origin, (position - ray_origin).normalize());
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let xs = intersect(&shape, &r);
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if xs.hit().is_some() {
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c.set(x, y, color);
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}
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}
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}
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let path = "/tmp/eoc5.png";
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println!("saving output to {}", path);
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c.write_to_file(path)?;
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Ok(())
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}
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