refactor: use Option to bypass bounding sphere system

src/object.rs

@@ -27,12 +27,12 @@ pub trait Surface {
     fn get_texture(&self, point: Point3f) -> Texture;
 
     // Creates a bounding sphere around the object.
-    fn bound(&self) -> Bound;
+    fn bound(&self) -> Option<Bound>;
 }
 
 pub struct Object {
     pub surface: Box<dyn Surface>,
-    bound: Bound,
+    bound: Option<Bound>,
 }
 
 impl Object {
@@ -46,7 +46,7 @@ impl Object {
     }
 
     pub fn intersect(&self, ray: Ray) -> Option<f64> {
-        if self.bound.is_intersected(ray) {
+        if !self.bound.as_ref().is_some_and(|b| !b.is_intersected(ray)) {
             self.surface.intersect(ray)
         } else {
             None

src/object/bound.rs

@@ -9,28 +9,13 @@ use crate::util::*;
 pub struct Bound {
     pub center: Point3f,
     pub radius: f64,
-
-    // If true, then the bounding sphere is disabled.
-    pub bypass: bool,
 }
 
 impl Bound {
     pub fn is_intersected(&self, ray: Ray) -> bool {
-        if self.bypass {
-            return true;
-        }
-
         let l = ray.origin - self.center;
         l.norm_squared() >= self.radius * self.radius
     }
 
     // pub fn contains(&self, point: &Point3f) -> bool { distance(&self.center, point) < self.radius }
-
-    pub fn bypass() -> Self {
-        Bound {
-            center: Point3::origin(),
-            radius: 0.0,
-            bypass: true,
-        }
-    }
 }

src/object/plane.rs

@@ -111,9 +111,8 @@ impl Surface for Plane {
         (*self.texture)(x, y)
     }
 
-    // Planes are infinite, so no finite
-    // bounding sphere could possibly contain one.
-    fn bound(&self) -> Bound {
-        Bound::bypass()
+    // Planes are infinite, so no finite bounding sphere could possibly contain one
+    fn bound(&self) -> Option<Bound> {
+        None
     }
 }

src/object/sphere.rs

@@ -89,11 +89,10 @@ impl Surface for Sphere {
         (*self.texture)(x, y)
     }
 
-    fn bound(&self) -> Bound {
-        Bound {
+    fn bound(&self) -> Option<Bound> {
+        Some(Bound {
             center: self.center,
             radius: self.radius,
-            bypass: false,
-        }
+        })
     }
 }

src/object/triangle.rs

@@ -212,7 +212,7 @@ impl Surface for TriangleMesh {
     }
 
     // Uses Welzl's algorithm to solve the bounding sphere problem
-    fn bound(&self) -> Bound {
+    fn bound(&self) -> Option<Bound> {
         fn smallest_sphere_plane(points: Vec<&Point3f>, boundary: Vec<&Point3f>) -> (Point3f, f64) {
             if points.len() == 0 || boundary.len() == 3 {
                 match boundary.len() {
@@ -270,7 +270,7 @@ impl Surface for TriangleMesh {
 
             let a = matrix.determinant() * 2.0;
 
-            if (a != 0.0) {
+            if a != 0.0 {
                 let mut matrix_mut = matrix.clone();
 
                 let squares = Vector4::new(
@@ -338,10 +338,9 @@ impl Surface for TriangleMesh {
 
         let (center, radius) = smallest_sphere(points, Vec::new());
 
-        Bound {
+        Some(Bound {
             center,
             radius: radius + 1e-3,
-            bypass: false,
-        }
+        })
     }
 }