Add boolean for drawing book cover.

rtiow/src/bin/tracer.rs

@@ -13,6 +13,8 @@ use rtiow::ray::Ray;
 use rtiow::sphere::Sphere;
 use rtiow::vec3::Vec3;
 
+const BOOK_COVER: bool = true;
+
 fn color(r: Ray, world: &Hit, depth: usize) -> Vec3 {
     if let Some(rec) = world.hit(r, 0.001, std::f32::MAX) {
         let scatter_response = rec.material.scatter(&r, &rec);
@@ -103,6 +105,23 @@ fn main() -> Result<(), std::io::Error> {
     let nx = 200;
     let ny = 100;
     let ns = 100;
+    let (cam, world) = if BOOK_COVER {
+        let lookfrom = Vec3::new(13., 2., 3.);
+        let lookat = Vec3::new(0., 0., 0.);
+        let dist_to_focus = 10.;
+        let aperture = 0.1;
+        let cam = Camera::new(
+            lookfrom,
+            lookat,
+            Vec3::new(0., 1., 0.),
+            20.,
+            nx as f32 / ny as f32,
+            aperture,
+            dist_to_focus,
+        );
+        let world = HitableList::new(random_scene());
+        (cam, world)
+    } else {
         let lookfrom = Vec3::new(3., 3., 2.);
         let lookat = Vec3::new(0., 0., -1.);
         let dist_to_focus = (lookfrom - lookat).length();
@@ -143,7 +162,8 @@ fn main() -> Result<(), std::io::Error> {
                 Box::new(Dielectric::new(1.5)),
             )),
         ]);
-    //let world = HitableList::new(random_scene());
+        (cam, world)
+    };
     println!("P3\n{} {}\n255", nx, ny);
     for j in (0..ny).rev() {
         for i in 0..nx {