From 5d57304d95f238d463133ade9cf2894e1cb9530c Mon Sep 17 00:00:00 2001
From: Bill Thiede <git@xinu.tv>
Date: Sun, 18 Jul 2021 16:55:29 -0700
Subject: [PATCH] eoc8: implement the end of chapter 8 challenge.  Note:

This implementation looks like crap and I'm not sure why.
---
 rtchallenge/examples/eoc8.rs | 107 +++++++++++++++++++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 rtchallenge/examples/eoc8.rs

diff --git a/rtchallenge/examples/eoc8.rs b/rtchallenge/examples/eoc8.rs
new file mode 100644
index 0000000..1749eeb
--- /dev/null
+++ b/rtchallenge/examples/eoc8.rs
@@ -0,0 +1,107 @@
+use std::{f32::consts::PI, time::Instant};
+
+use anyhow::Result;
+use structopt::StructOpt;
+
+use rtchallenge::{
+    camera::{Camera, RenderStrategy},
+    lights::PointLight,
+    materials::Material,
+    matrices::Matrix4x4,
+    spheres::Sphere,
+    transformations::view_transform,
+    tuples::{Color, Tuple},
+    world::World,
+    WHITE,
+};
+
+/// End of chapter 8 challenge.
+#[derive(StructOpt, Debug)]
+#[structopt(name = "eoc8")]
+struct Opt {
+    #[structopt(long, default_value = "rayon")]
+    render_strategy: RenderStrategy,
+}
+
+fn main() -> Result<()> {
+    let start = Instant::now();
+    let opt = Opt::from_args();
+    let width = 2560;
+    let height = 1440;
+    let light_position = Tuple::point(-10., 10., -10.);
+    let light_color = WHITE;
+    let light = PointLight::new(light_position, light_color);
+    let mut camera = Camera::new(width, height, PI / 4.);
+    let from = Tuple::point(0., 1.5, -5.);
+    let to = Tuple::point(0., 1., 0.);
+    let up = Tuple::point(0., 1., 0.);
+    camera.set_transform(view_transform(from, to, up));
+    camera.render_strategy = opt.render_strategy;
+
+    let mut floor = Sphere::default();
+    floor.set_transform(Matrix4x4::scaling(10., 0.01, 10.));
+    floor.material = Material {
+        color: Color::new(1., 0.9, 0.9),
+        specular: 0.,
+        ..Material::default()
+    };
+
+    let mut left_wall = Sphere::default();
+    left_wall.set_transform(
+        Matrix4x4::translation(0., 0., 5.)
+            * Matrix4x4::rotation_y(-PI / 4.)
+            * Matrix4x4::rotation_x(PI / 2.)
+            * Matrix4x4::scaling(10., 0.01, 10.),
+    );
+    left_wall.material = floor.material.clone();
+
+    let mut right_wall = Sphere::default();
+    right_wall.set_transform(
+        Matrix4x4::translation(0., 0., 5.)
+            * Matrix4x4::rotation_y(PI / 4.)
+            * Matrix4x4::rotation_x(PI / 2.)
+            * Matrix4x4::scaling(10., 0.00001, 10.),
+    );
+    right_wall.material = floor.material.clone();
+
+    let mut middle = Sphere::default();
+    middle.set_transform(Matrix4x4::translation(-0.5, 1., 0.5));
+    middle.material = Material {
+        color: Color::new(0.1, 1., 0.5),
+        diffuse: 0.7,
+        specular: 0.3,
+        ..Material::default()
+    };
+
+    let mut right = Sphere::default();
+    right.set_transform(Matrix4x4::translation(1.5, 0.5, -0.5) * Matrix4x4::scaling(0.5, 0.5, 0.5));
+    right.material = Material {
+        color: Color::new(0.5, 1., 0.1),
+        diffuse: 0.7,
+        specular: 0.3,
+        ..Material::default()
+    };
+
+    let mut left = Sphere::default();
+    left.set_transform(
+        Matrix4x4::translation(-1.5, 0.33, -0.75) * Matrix4x4::scaling(0.33, 0.33, 0.33),
+    );
+    left.material = Material {
+        color: Color::new(1., 0.8, 0.1),
+        diffuse: 0.7,
+        specular: 0.3,
+        ..Material::default()
+    };
+
+    let mut world = World::default();
+    world.light = Some(light);
+    world.objects = vec![floor, left_wall, right_wall, middle, right, left];
+
+    let image = camera.render(&world);
+
+    let path = "/tmp/eoc8.png";
+    println!("saving output to {}", path);
+    image.write_to_file(path)?;
+    println!("Render time {:.3} seconds", start.elapsed().as_secs_f32());
+    Ok(())
+}