From 823e75da887c0678afa4265440def73a7bb1f78a Mon Sep 17 00:00:00 2001
From: Bill Thiede <git@xinu.tv>
Date: Mon, 10 Sep 2018 21:50:40 -0700
Subject: [PATCH] Add boolean for drawing book cover.

---
 rtiow/src/bin/tracer.rs | 102 ++++++++++++++++++++++++----------------
 1 file changed, 61 insertions(+), 41 deletions(-)

diff --git a/rtiow/src/bin/tracer.rs b/rtiow/src/bin/tracer.rs
index 81fd764..67ec0f1 100644
--- a/rtiow/src/bin/tracer.rs
+++ b/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);
@@ -103,47 +105,65 @@ fn main() -> Result<(), std::io::Error> {
     let nx = 200;
     let ny = 100;
     let ns = 100;
-    let lookfrom = Vec3::new(3., 3., 2.);
-    let lookat = Vec3::new(0., 0., -1.);
-    let dist_to_focus = (lookfrom - lookat).length();
-    let aperture = 2.;
-    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(vec![
-        Box::new(Sphere::new(
-            Vec3::new(0., 0., -1.),
-            0.5,
-            Box::new(Lambertian::new(Vec3::new(0.1, 0.2, 0.5))),
-        )),
-        Box::new(Sphere::new(
-            Vec3::new(0., -100.5, -1.),
-            100.,
-            Box::new(Lambertian::new(Vec3::new(0.8, 0.8, 0.))),
-        )),
-        Box::new(Sphere::new(
-            Vec3::new(1., 0., -1.),
-            0.5,
-            Box::new(Metal::new(Vec3::new(0.8, 0.6, 0.2), 0.2)),
-        )),
-        Box::new(Sphere::new(
-            Vec3::new(-1., 0., -1.),
-            0.5,
-            Box::new(Dielectric::new(1.5)),
-        )),
-        Box::new(Sphere::new(
-            Vec3::new(-1., 0., -1.),
-            -0.45,
-            Box::new(Dielectric::new(1.5)),
-        )),
-    ]);
-    //let world = HitableList::new(random_scene());
+    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();
+        let aperture = 2.;
+        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(vec![
+            Box::new(Sphere::new(
+                Vec3::new(0., 0., -1.),
+                0.5,
+                Box::new(Lambertian::new(Vec3::new(0.1, 0.2, 0.5))),
+            )),
+            Box::new(Sphere::new(
+                Vec3::new(0., -100.5, -1.),
+                100.,
+                Box::new(Lambertian::new(Vec3::new(0.8, 0.8, 0.))),
+            )),
+            Box::new(Sphere::new(
+                Vec3::new(1., 0., -1.),
+                0.5,
+                Box::new(Metal::new(Vec3::new(0.8, 0.6, 0.2), 0.2)),
+            )),
+            Box::new(Sphere::new(
+                Vec3::new(-1., 0., -1.),
+                0.5,
+                Box::new(Dielectric::new(1.5)),
+            )),
+            Box::new(Sphere::new(
+                Vec3::new(-1., 0., -1.),
+                -0.45,
+                Box::new(Dielectric::new(1.5)),
+            )),
+        ]);
+        (cam, world)
+    };
     println!("P3\n{} {}\n255", nx, ny);
     for j in (0..ny).rev() {
         for i in 0..nx {