.drone.yml

@@ -10,14 +10,6 @@ steps:
   - env | sort
   - find $PWD
 
-- name: rtchallenge
-  image: registry.z.xinu.tv/drone/omnibus
-  commands:
-  - (cd rtchallenge && cargo build --examples)
-  - (cd rtchallenge && cargo test)
-  - (cd rtchallenge && cargo build --examples --no-default-features)
-  - (cd rtchallenge && cargo test --no-default-features)
-
 - name: rtiow
   image: registry.z.xinu.tv/drone/omnibus
   commands:

rtchallenge/examples/eoc7.rs

@@ -95,7 +95,7 @@ fn main() -> Result<()> {
     };
 
     let mut world = World::default();
-    world.lights = vec![light];
+    world.light = Some(light);
     world.objects = vec![floor, left_wall, right_wall, middle, right, left];
 
     let image = camera.render(&world);

rtchallenge/examples/eoc8.rs

@@ -33,16 +33,9 @@ fn main() -> Result<()> {
     let opt = Opt::from_args();
     let width = 2560;
     let height = 1440;
-
     let light_position = Tuple::point(-10., 10., -10.);
     let light_color = WHITE;
-    let light1 = PointLight::new(light_position, light_color);
-    let light_position = Tuple::point(10., 10., -10.);
-    let light_color = Color::new(0.2, 0.2, 0.2);
-    let light2 = PointLight::new(light_position, light_color);
-    let light_position = Tuple::point(0., 10., -10.);
-    let light3 = PointLight::new(light_position, light_color);
-
+    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.);
@@ -89,9 +82,9 @@ fn main() -> Result<()> {
     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(1., 1., 1.),
+        color: Color::new(0.5, 1., 0.1),
         diffuse: 0.7,
-        specular: 0.0,
+        specular: 0.3,
         ..Material::default()
     };
 
@@ -107,7 +100,7 @@ fn main() -> Result<()> {
     };
 
     let mut world = World::default();
-    world.lights = vec![light1, light2, light3];
+    world.light = Some(light);
     world.objects = vec![floor, left_wall, right_wall, middle, right, left];
 
     let image = camera.render(&world);

rtchallenge/src/spheres.rs

@@ -9,6 +9,7 @@ use crate::{
 #[derive(Debug, PartialEq, Clone)]
 /// Sphere represents the unit-sphere (radius of unit 1.) at the origin 0., 0., 0.
 pub struct Sphere {
+    // TODO(wathiede): cache inverse to speed up intersect.
     transform: Matrix4x4,
     inverse_transform: Matrix4x4,
     pub material: Material,

rtchallenge/src/world.rs

@@ -6,7 +6,7 @@ use crate::{
     rays::Ray,
     spheres::{intersect, Sphere},
     tuples::{Color, Tuple},
-    Float, BLACK, WHITE,
+    BLACK, WHITE,
 };
 
 /// World holds all drawable objects and the light(s) that illuminate them.
@@ -17,12 +17,13 @@ use crate::{
 ///
 /// let w = World::default();
 /// assert!(w.objects.is_empty());
-/// assert_eq!(w.lights.len(), 0);
+/// assert_eq!(w.light, None);
 /// ```
 
 #[derive(Clone, Debug, Default)]
 pub struct World {
-    pub lights: Vec<PointLight>,
+    // TODO(wathiede): make this a list of abstract Light traits.
+    pub light: Option<PointLight>,
     pub objects: Vec<Sphere>,
 }
 
@@ -35,7 +36,7 @@ impl World {
     ///
     /// let w = World::test_world();
     /// assert_eq!(w.objects.len(), 2);
-    /// assert!(!w.lights.is_empty());
+    /// assert!(w.light.is_some());
     /// ```
     pub fn test_world() -> World {
         let light = PointLight::new(Tuple::point(-10., 10., -10.), WHITE);
@@ -49,7 +50,7 @@ impl World {
         let mut s2 = Sphere::default();
         s2.set_transform(Matrix4x4::scaling(0.5, 0.5, 0.5));
         World {
-            lights: vec![light],
+            light: Some(light),
             objects: vec![s1, s2],
         }
     }
@@ -109,7 +110,7 @@ impl World {
     ///
     /// // Shading an intersection from the inside.
     /// let mut w = World::test_world();
-    /// w.lights = vec![PointLight::new(Tuple::point(0., 0.25, 0.), WHITE)];
+    /// w.light = Some(PointLight::new(Tuple::point(0., 0.25, 0.), WHITE));
     /// let r = Ray::new(Tuple::point(0., 0., 0.), Tuple::vector(0., 0., 1.));
     /// let s = &w.objects[1];
     /// let i = Intersection::new(0.5, &s);
@@ -119,7 +120,7 @@ impl World {
     ///
     /// // Shading with an intersection in shadow.
     /// let mut w = World::default();
-    /// w.lights = vec![PointLight::new(Tuple::point(0., 0., -10.), WHITE)];
+    /// w.light = Some(PointLight::new(Tuple::point(0., 0., -10.), WHITE));
     /// let s1 = Sphere::default();
     /// let mut s2 = Sphere::default();
     /// s2.set_transform(Matrix4x4::translation(0., 0., 10.));
@@ -131,21 +132,17 @@ impl World {
     /// assert_eq!(c, Color::new(0.1, 0.1, 0.1));
     /// ```
     pub fn shade_hit(&self, comps: &PrecomputedData) -> Color {
-        let c = self
-            .lights
-            .iter()
-            .fold(Color::new(0., 0., 0.), |acc, light| {
-                let shadowed = self.is_shadowed(comps.over_point, light);
-                acc + lighting(
+        // TODO(wathiede): support multiple light sources by iterating over all
+        // the light sources and summing the calls to lighting.
+        let shadowed = self.is_shadowed(comps.over_point);
+        lighting(
             &comps.object.material,
-                    light,
+            &self.light.as_ref().expect("World has no lights"),
             comps.over_point,
             comps.eyev,
             comps.normalv,
             shadowed,
         )
-            });
-        c / self.lights.len() as Float
     }
     /// Compute color for given ray fired at the world.
     ///
@@ -206,24 +203,28 @@ impl World {
     /// };
     ///
     /// let w = World::test_world();
-    /// let light = &w.lights[0];
     ///
     /// // There is no shadow when nothing is collinear with point and light.
     /// let p = Tuple::point(0.,10.,0.);
-    /// assert_eq!(w.is_shadowed(p,light), false);
+    /// assert_eq!(w.is_shadowed(p), false);
     ///
     /// // There shadow when an object is between the point and the light.
     /// let p = Tuple::point(10.,-10.,10.);
-    /// assert_eq!(w.is_shadowed(p,light), true);
+    /// assert_eq!(w.is_shadowed(p), true);
     ///
     /// // There is no shadow when an object is behind the light.
     /// let p = Tuple::point(-20.,20.,-20.);
-    /// assert_eq!(w.is_shadowed(p,light), false);
+    /// assert_eq!(w.is_shadowed(p), false);
     ///
     /// // There is no shadow when an object is behind the point.
     /// let p = Tuple::point(-2.,2.,-2.);
-    /// assert_eq!(w.is_shadowed(p,light), false);
-    pub fn is_shadowed(&self, point: Tuple, light: &PointLight) -> bool {
+    /// assert_eq!(w.is_shadowed(p), false);
+    pub fn is_shadowed(&self, point: Tuple) -> bool {
+        // TODO(wathiede): how to make this multi light aware?
+        let light = self
+            .light
+            .as_ref()
+            .expect("cannot compute is_shadowed in world with no light");
         let v = light.position - point;
         let distance = v.magnitude();
         let direction = v.normalize();