Add existing files

src/main.rs

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+extern crate nalgebra as na;
+
+use std::cmp::Ordering;
+use std::fs::File;
+use std::io::Write;
+
+use na::*;
+use na::geometry::Point3;
+
+mod camera; use camera::*;
+mod types; use types::*;
+mod object; use object::*;
+
+fn cast_ray(ray: Ray, scene: &Scene) -> Color {
+    //Color::new(0.0, -ray.direction.x, ray.direction.y)
+
+    let closest = scene.iter()
+                       .filter_map(|obj| obj.intersect(ray)
+                                            .map(|x| (obj, x)))
+                       .min_by(|a, b| a.1.partial_cmp(&b.1).unwrap_or(Ordering::Equal));
+
+    if closest.is_some() {
+        Color::new(1.0, 1.0, 1.0)
+    } else {
+        Color::new(0.0, 0.0, 0.0)
+    }
+}
+
+fn render(camera: &Camera, scene: &Scene, filename: &str) -> std::io::Result<()> {
+    let width  = camera.image_size.x;
+    let height = camera.image_size.y;
+
+    let mut buffer: Vec<Color> = Vec::with_capacity((width * height) as usize);
+
+    for j in 0..height {
+        for i in 0..width {
+            let ray = camera.raycast(i, j);
+            buffer.push(cast_ray(ray, &scene));
+        }
+        // println!("Rendered row {}", j);
+    }
+
+    let mut file = File::create(filename)?;
+    file.set_len(0)?;
+    file.write_all(format!("P6\n{} {}\n255\n", width, height).as_bytes())?;
+    for color in buffer.into_iter() {
+        file.write_all(&color.to_byte_array())?;
+    }
+    Ok(())
+}
+
+fn main() -> std::io::Result<()> {
+
+    let camera = Camera::new(Point3::new(0.0,0.0,0.0), Vector3::new(0.0,0.0,-1.0), 1.0, 2.0, 2.0, 400, 400);
+
+    let scene = vec![
+        Object::Sphere(Sphere::new(0.0,0.0,-5.0,2.0)),
+        Object::Sphere(Sphere::new(-3.0,0.0,-8.0,2.5))
+    ];
+
+    render(&camera, &scene, "out.ppm")
+}