Add compound of five cubes

examples/compound.rs

@@ -0,0 +1,61 @@
+//! Compound of five cubes: https://en.wikipedia.org/wiki/Compound_of_five_cubes
+
+use rpt::*;
+
+fn lamp(x: f64, y: f64, z: f64, r: f64, e: f64) -> Light {
+    Light::Object(
+        Object::new(
+            sphere()
+                .scale(&glm::vec3(r, r, r))
+                .translate(&glm::vec3(x, y, z)),
+        )
+        .material(Material::light(glm::vec3(1.0, 1.0, 1.0), e)),
+    )
+}
+
+fn main() -> color_eyre::Result<()> {
+    color_eyre::install()?;
+
+    let mut scene = Scene::new();
+
+    // Related to the golden ratio, computed by hand with some geometry
+    let magic_angle = ((3.0 * 5.0_f64.sqrt() - 1.0) / 8.0).acos();
+
+    // Five cubes make up the compound; exploit symmetries
+    let c_central = Cube;
+    let c_green = c_central.rotate(-magic_angle, &glm::vec3(1.0, 1.0, 1.0));
+    let c_red = c_green.scale(&glm::vec3(-1.0, 1.0, 1.0));
+    let c_blue = c_green.scale(&glm::vec3(1.0, -1.0, 1.0));
+    let c_orange = c_red.scale(&glm::vec3(1.0, -1.0, 1.0));
+
+    scene.add(Object::new(c_central).material(Material::specular(hex_color(0xC144EB), 0.4)));
+    scene.add(Object::new(c_green).material(Material::specular(hex_color(0x45E542), 0.4)));
+    scene.add(Object::new(c_red).material(Material::specular(hex_color(0xF55142), 0.4)));
+    scene.add(Object::new(c_blue).material(Material::specular(hex_color(0x4275F5), 0.4)));
+    scene.add(Object::new(c_orange).material(Material::specular(hex_color(0xF5BF42), 0.4)));
+
+    scene.add(
+        Object::new(plane(glm::vec3(0.0, 1.0, 0.0), -0.80902))
+            .material(Material::diffuse(hex_color(0xFFFFFF))),
+    );
+
+    scene.add(lamp(-2.0, 3.5, 0.5, 0.5, 60.0));
+    scene.add(lamp(0.0, 0.5, 5.0, 1.0, 2.0));
+    scene.add(lamp(2.0, 1.0, -5.0, 0.6, 10.0));
+
+    let camera = Camera::look_at(
+        glm::vec3(-0.9, 1.2, 2.4),
+        glm::vec3(0.0, 0.0, 0.0),
+        glm::vec3(0.0, 1.0, 0.0),
+        std::f64::consts::FRAC_PI_4,
+    );
+    Renderer::new(&scene, camera)
+        .width(1024)
+        .height(1024)
+        .max_bounces(5)
+        .num_samples(50)
+        .render()
+        .save("output.png")?;
+
+    Ok(())
+}