shapes: create generic Shape object with Sphere implementation.

rtchallenge/examples/eoc6.rs

@@ -21,13 +21,13 @@ fn main() -> Result<()> {
     let pixel_size = wall_size / w as Float;
     let half = wall_size / 2.;
     let mut shape = Shape::sphere();
-    shape.material = Material {
+    shape.set_material(Material {
         color: Color::new(1., 0.2, 1.),
         specular: 0.5,
         diffuse: 0.7,
         shininess: 30.,
         ..Material::default()
-    };
+    });
     let light_position = Tuple::point(-10., 10., -10.);
     let light_color = WHITE;
     let light = PointLight::new(light_position, light_color);
@@ -44,7 +44,14 @@ fn main() -> Result<()> {
                 let point = r.position(hit.t);
                 let normal = hit.object.normal_at(point);
                 let eye = -r.direction;
-                let color = lighting(&hit.object.material, &light, point, eye, normal, in_shadow);
+                let color = lighting(
+                    &hit.object.material(),
+                    &light,
+                    point,
+                    eye,
+                    normal,
+                    in_shadow,
+                );
                 c.set(x, y, color);
             }
         }

rtchallenge/examples/eoc7.rs

@@ -41,11 +41,11 @@ fn main() -> Result<()> {
 
     let mut floor = Shape::sphere();
     floor.set_transform(Matrix4x4::scaling(10., 0.01, 10.));
-    floor.material = Material {
+    floor.set_material(Material {
         color: Color::new(1., 0.9, 0.9),
         specular: 0.,
         ..Material::default()
-    };
+    });
 
     let mut left_wall = Shape::sphere();
     left_wall.set_transform(
@@ -54,7 +54,7 @@ fn main() -> Result<()> {
             * Matrix4x4::rotation_x(PI / 2.)
             * Matrix4x4::scaling(10., 0.01, 10.),
     );
-    left_wall.material = floor.material.clone();
+    left_wall.set_material(floor.material().clone());
 
     let mut right_wall = Shape::sphere();
     right_wall.set_transform(
@@ -63,36 +63,36 @@ fn main() -> Result<()> {
             * Matrix4x4::rotation_x(PI / 2.)
             * Matrix4x4::scaling(10., 0.01, 10.),
     );
-    right_wall.material = floor.material.clone();
+    right_wall.set_material(floor.material().clone());
 
     let mut middle = Shape::sphere();
     middle.set_transform(Matrix4x4::translation(-0.5, 1., 0.5));
-    middle.material = Material {
+    middle.set_material(Material {
         color: Color::new(0.1, 1., 0.5),
         diffuse: 0.7,
         specular: 0.3,
         ..Material::default()
-    };
+    });
 
     let mut right = Shape::sphere();
     right.set_transform(Matrix4x4::translation(1.5, 0.5, -0.5) * Matrix4x4::scaling(0.5, 0.5, 0.5));
-    right.material = Material {
+    right.set_material(Material {
         color: Color::new(0.5, 1., 0.1),
         diffuse: 0.7,
         specular: 0.3,
         ..Material::default()
-    };
+    });
 
     let mut left = Shape::sphere();
     left.set_transform(
         Matrix4x4::translation(-1.5, 0.33, -0.75) * Matrix4x4::scaling(0.33, 0.33, 0.33),
     );
-    left.material = Material {
+    left.set_material(Material {
         color: Color::new(1., 0.8, 0.1),
         diffuse: 0.7,
         specular: 0.3,
         ..Material::default()
-    };
+    });
 
     let mut world = World::default();
     world.lights = vec![light];

rtchallenge/examples/eoc8.rs

@@ -53,11 +53,11 @@ fn main() -> Result<()> {
 
     let mut floor = Shape::sphere();
     floor.set_transform(Matrix4x4::scaling(10., 0.01, 10.));
-    floor.material = Material {
+    floor.set_material(Material {
         color: Color::new(1., 0.9, 0.9),
         specular: 0.,
         ..Material::default()
-    };
+    });
 
     let mut left_wall = Shape::sphere();
     left_wall.set_transform(
@@ -66,7 +66,7 @@ fn main() -> Result<()> {
             * Matrix4x4::rotation_x(PI / 2.)
             * Matrix4x4::scaling(10., 0.01, 10.),
     );
-    left_wall.material = floor.material.clone();
+    left_wall.set_material(floor.material().clone());
 
     let mut right_wall = Shape::sphere();
     right_wall.set_transform(
@@ -75,36 +75,36 @@ fn main() -> Result<()> {
             * Matrix4x4::rotation_x(PI / 2.)
             * Matrix4x4::scaling(10., 0.00001, 10.),
     );
-    right_wall.material = floor.material.clone();
+    right_wall.set_material(floor.material().clone());
 
     let mut middle = Shape::sphere();
     middle.set_transform(Matrix4x4::translation(-0.5, 1., 0.5));
-    middle.material = Material {
+    middle.set_material(Material {
         color: Color::new(0.1, 1., 0.5),
         diffuse: 0.7,
         specular: 0.3,
         ..Material::default()
-    };
+    });
 
     let mut right = Shape::sphere();
     right.set_transform(Matrix4x4::translation(1.5, 0.5, -0.5) * Matrix4x4::scaling(0.5, 0.5, 0.5));
-    right.material = Material {
+    right.set_material(Material {
         color: Color::new(1., 1., 1.),
         diffuse: 0.7,
         specular: 0.0,
         ..Material::default()
-    };
+    });
 
     let mut left = Shape::sphere();
     left.set_transform(
         Matrix4x4::translation(-1.5, 0.33, -0.75) * Matrix4x4::scaling(0.33, 0.33, 0.33),
     );
-    left.material = Material {
+    left.set_material(Material {
         color: Color::new(1., 0.8, 0.1),
         diffuse: 0.7,
         specular: 0.3,
         ..Material::default()
-    };
+    });
 
     let mut world = World::default();
     world.lights = vec![light1, light2, light3];

rtchallenge/src/shapes.rs

@@ -12,14 +12,11 @@ enum Geometry {
     Sphere,
 }
 
-/// Shape represents visible objects.  A signal instance of Shape can generically represent one of
-/// many different shapes based on the value of it's geometry field.  Users chose the shape by
-/// calling the appropriate constructor, i.e. [Shape::sphere].
 #[derive(Debug, PartialEq, Clone)]
 pub struct Shape {
     transform: Matrix4x4,
     inverse_transform: Matrix4x4,
-    pub material: Material,
+    material: Material,
     geometry: Geometry,
 }
 
@@ -39,13 +36,13 @@ impl Shape {
     /// assert_eq!(s.transform(), t);
     ///
     /// // Default Sphere has the default material.
-    /// assert_eq!(s.material, Material::default());
+    /// assert_eq!(s.material(), &Material::default());
     /// // It can be overridden.
     /// let mut s = Shape::sphere();
     /// let mut m = Material::default();
     /// m.ambient = 1.;
-    /// s.material = m.clone();
-    /// assert_eq!(s.material, m);
+    /// *s.material_mut() = m.clone();
+    /// assert_eq!(s.material(), &m);
     /// ```
     pub fn sphere() -> Shape {
         Shape {
@@ -148,6 +145,18 @@ impl Shape {
         self.transform = t;
         self.inverse_transform = t.inverse();
     }
+
+    pub fn material(&self) -> &Material {
+        &self.material
+    }
+
+    pub fn material_mut(&mut self) -> &mut Material {
+        &mut self.material
+    }
+
+    pub fn set_material(&mut self, m: Material) {
+        self.material = m;
+    }
 }
 
 /// Intersect a ray with a sphere.

rtchallenge/src/world.rs

@@ -40,12 +40,12 @@ impl World {
     pub fn test_world() -> World {
         let light = PointLight::new(Tuple::point(-10., 10., -10.), WHITE);
         let mut s1 = Shape::sphere();
-        s1.material = Material {
+        s1.set_material(Material {
             color: Color::new(0.8, 1., 0.6),
             diffuse: 0.7,
             specular: 0.2,
             ..Material::default()
-        };
+        });
         let mut s2 = Shape::sphere();
         s2.set_transform(Matrix4x4::scaling(0.5, 0.5, 0.5));
         World {
@@ -137,7 +137,7 @@ impl World {
             .fold(Color::new(0., 0., 0.), |acc, light| {
                 let shadowed = self.is_shadowed(comps.over_point, light);
                 acc + lighting(
-                    &comps.object.material,
+                    &comps.object.material(),
                     light,
                     comps.over_point,
                     comps.eyev,
@@ -177,15 +177,15 @@ impl World {
     /// let w = {
     ///     let mut w = World::test_world();
     ///     let mut outer = &mut w.objects[0];
-    ///     let m = outer.material.ambient = 1.;
+    ///     let m = outer.material_mut().ambient = 1.;
     ///     let inner = &mut w.objects[1];
-    ///     inner.material.ambient = 1.;
+    ///     inner.material_mut().ambient = 1.;
     ///     w
     /// };
     /// let inner = &w.objects[1];
     /// let r = Ray::new(Tuple::point(0., 0., 0.75), Tuple::vector(0., 0., -1.));
     /// let c = w.color_at(&r);
-    /// assert_eq!(c, inner.material.color);
+    /// assert_eq!(c, inner.material().color);
     /// ```
     pub fn color_at(&self, r: &Ray) -> Color {
         match self.intersect(r).hit() {