eoc9: implement using prelude and builder pattern.

rtchallenge/examples/eoc9-prelude.rs

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+use std::time::Instant;
+
+use anyhow::Result;
+use structopt::StructOpt;
+
+use rtchallenge::prelude::*;
+
+use rtchallenge::{camera::RenderStrategy, float::consts::PI, WHITE};
+
+/// End of chapter 9 challenge.
+#[derive(StructOpt, Debug)]
+#[structopt(name = "eoc9")]
+struct Opt {
+    #[structopt(long, default_value = "rayon")]
+    render_strategy: RenderStrategy,
+    /// Number of samples per pixel.  0 renders from the center of the pixel, 1 or more samples N
+    /// times randomly across the pixel.
+    #[structopt(short, long, default_value = "0")]
+    samples: usize,
+}
+
+fn main() -> Result<()> {
+    let start = Instant::now();
+    let opt = Opt::from_args();
+    let width = 2560;
+    let height = 1440;
+
+    let light1 = PointLightBuilder::default()
+        .position(point(-5., 5., -5.))
+        .intensity(WHITE)
+        .build()?;
+    let light2 = PointLightBuilder::default()
+        .position(point(5., 5., -5.))
+        .intensity([0.2, 0.2, 0.6])
+        .build()?;
+    let light3 = PointLightBuilder::default()
+        .position(point(0., 2., -5.))
+        .intensity([0.2, 0.2, 0.1])
+        .build()?;
+
+    let from = point(0., 1.5, -5.);
+    let to = point(0., 1., 0.);
+    let up = point(0., 1., 0.);
+    let camera = CameraBuilder::default()
+        .hsize(width)
+        .vsize(height)
+        .field_of_view(PI / 4.)
+        .transform(view_transform(from, to, up))
+        .render_strategy(opt.render_strategy)
+        .samples_per_pixel(opt.samples)
+        .build()?;
+
+    let floor = plane()
+        .material(
+            MaterialBuilder::default()
+                .color([1., 0.2, 0.2])
+                .specular(0.)
+                .build()?,
+        )
+        .build()?;
+
+    let ceiling = plane()
+        .transform(translation(0., 6., 0.) * rotation_x(PI))
+        .material(
+            MaterialBuilder::default()
+                .color([0.6, 0.6, 0.8])
+                .specular(0.2)
+                .build()?,
+        )
+        .build()?;
+
+    let middle = sphere()
+        .transform(translation(-0.5, 0.5, 0.5))
+        .material(
+            MaterialBuilder::default()
+                .color([0.1, 1., 0.5])
+                .diffuse(0.7)
+                .specular(0.3)
+                .build()?,
+        )
+        .build()?;
+
+    let right = sphere()
+        .transform(translation(1.5, 0.5, -0.5) * scaling(0.5, 0.5, 0.5))
+        .material(
+            MaterialBuilder::default()
+                .color([1., 1., 1.])
+                .diffuse(0.7)
+                .specular(0.0)
+                .build()?,
+        )
+        .build()?;
+
+    let left = sphere()
+        .transform(translation(-1.5, 0.33, -0.75) * scaling(0.33, 0.33, 0.33))
+        .material(
+            MaterialBuilder::default()
+                .color([1., 0.8, 0.1])
+                .diffuse(0.7)
+                .specular(0.3)
+                .build()?,
+        )
+        .build()?;
+
+    let world = WorldBuilder::default()
+        .lights(vec![light1, light2, light3])
+        .objects(vec![floor, ceiling, middle, right, left])
+        .build()?;
+
+    let image = camera.render(&world);
+
+    let path = "/tmp/eoc9.png";
+    println!("saving output to {}", path);
+    image.write_to_file(path)?;
+    println!("Render time {:.3} seconds", start.elapsed().as_secs_f32());
+    Ok(())
+}