Add translation and rotation

src/hittable.rs

@@ -19,6 +19,30 @@ pub struct HitRecord<'material> {
     pub material: &'material Arc<Material>
 }
 
+impl<'material> HitRecord<'material> {
+    pub fn normalized(&mut self, ray: &Ray) {
+        let dot = ray.direction().dot(&self.normal);
+        let front_face = dot < 0.0;
+        let normal = if front_face { self.normal } else { -self.normal };
+        self.normal = normal;
+        self.front_face = front_face;
+    }
+    /*pub fn normalized(& self) -> Self {
+        let dot = ray.direction().dot(self.normal);
+        let front_face = dot < 0.0;
+        let normal = if front_face { self.normal } else { -self.normal };
+        HitRecord {
+            point: self.point,
+            normal,
+            t: self.t,
+            u: self.u,
+            v: self.v,
+            front_face,
+            material: self.material
+        }
+    }*/
+}
+
 pub trait Hittable {
     fn hit(&self, ray: &Ray, t_min: f64, t_max: f64) -> Option<HitRecord>;
     fn bounding_box(&self, time0: f64, time1: f64) -> Option<Aabb>;
@@ -74,19 +98,18 @@ impl Hittable for Sphere {
         }
         let point = ray.at(root);
         let normal = (point - self.center) / self.radius;
-        let dot = ray.direction().dot(&normal);
-        let front_face = dot < 0.0;
         let (u, v) = Sphere::uv(&normal);
-        let normal = if front_face { normal } else { -normal };
-        Some(HitRecord {
+        let mut rec = HitRecord {
             point,
             normal,
             t: root,
             u,
             v,
-            front_face,
+            front_face: false, // Will be set during normalied()
             material: &self.material
-        })
+        };
+        rec.normalized(ray);
+        Some(rec)
     }
     fn bounding_box(&self, _time0: f64, _time1: f64) -> Option<Aabb> {
         let s = Vec3::new(self.radius, self.radius, self.radius);

src/main.rs

@@ -17,6 +17,8 @@ use crate::noise::NoiseTexture;
 use crate::perlin::Perlin;
 use crate::texture::CheckerTexture;
 use crate::rect::{Plane, Rect2D};
+use crate::rotate_y::RotateY;
+use crate::translate::Translate;
 
 mod vec3;
 mod ray;
@@ -32,10 +34,12 @@ mod noise;
 mod image_texture;
 mod rect;
 mod cuboid;
+mod translate;
+mod rotate_y;
 
 // Image
 const DEFAULT_ASPECT_RATIO: f64 = 3.0 / 2.0;
-const IMAGE_WIDTH: usize = 600;
+const IMAGE_WIDTH: usize = 400;
 const SAMPLES_PER_PIXEL: i32 = 100;
 const MAX_DEPTH: i32 = 50;
 
@@ -113,16 +117,32 @@ fn cornell_box() -> Scene {
     )));
 
     // Boxes
-    world.push(Arc::new(Cuboid::new(
-        Point3::new(130.0, 0.0, 65.0),
-        Point3::new(295.0, 165.0, 230.0),
+    let rotated1 = RotateY::new(
+        Cuboid::new(
+            Point3::new(0.0, 0.0, 0.0),
+            Point3::new(165.0, 330.0, 165.0),
             white.clone()
-    )));
-    world.push(Arc::new(Cuboid::new(
-        Point3::new(265.0, 0.0, 295.0),
-        Point3::new(430.0, 330.0, 460.0),
+        ),
+        15.0
+    );
+    let box1 = Translate::new(
+        rotated1,
+        Vec3::new(265.0, 0.0, 295.0)
+    );
+    world.push(Arc::new(box1));
+    let rotated2 = RotateY::new(
+        Cuboid::new(
+            Point3::new(0.0, 0.0, 0.0),
+            Point3::new(165.0, 165.0, 165.0),
             white.clone()
-    )));
+        ),
+        -18.0
+    );
+    let box2 = Translate::new(
+        rotated2,
+        Vec3::new(130.0,0.0,65.0)
+    );
+    world.push(Arc::new(box2));
 
 
     let look_from = Point3::new(278.0, 278.0, -800.0);

src/translate.rs

@@ -0,0 +1,48 @@
+use crate::hittable::{HitRecord, Hittable};
+use crate::{Aabb, Ray, Vec3};
+
+pub struct Translate<H: Hittable> {
+    hittable: H,
+    offset: Vec3
+}
+
+impl<H: Hittable> Translate<H> {
+    pub fn new(hittable: H, offset: Vec3) -> Self {
+        Self { hittable, offset }
+    }
+}
+
+impl<H: Hittable> Hittable for Translate<H> {
+    fn hit(&self, ray: &Ray, t_min: f64, t_max: f64) -> Option<HitRecord> {
+        let moved_ray = Ray::new(
+            ray.origin() - self.offset,
+            ray.direction(),
+            ray.time());
+        match &self.hittable.hit(&moved_ray, t_min, t_max) {
+            Some(hit_record) => {
+                let mut hr = HitRecord {
+                    point: hit_record.point,
+                    material: hit_record.material,
+                    front_face: hit_record.front_face, // Maybe need to calc normal and front_face again?
+                    normal: hit_record.normal,
+                    t: hit_record.t,
+                    u: hit_record.u,
+                    v: hit_record.v
+                };
+                hr.normalized(ray);
+                Some(hr)
+            }
+            _ => None
+        }
+    }
+
+    fn bounding_box(&self, time0: f64, time1: f64) -> Option<Aabb> {
+        match &self.hittable.bounding_box(time0, time1) {
+            Some(bounding_box) => Some(Aabb {
+                minimum: bounding_box.minimum + self.offset,
+                maximum: bounding_box.maximum + self.offset,
+            }),
+            _ => None
+        }
+    }
+}

src/vec3.rs

@@ -1,5 +1,5 @@
 use std::fmt::{Display, Formatter};
-use std::ops::{Add, AddAssign, Div, Mul, Neg, Sub, Index, MulAssign};
+use std::ops::{Add, AddAssign, Div, Mul, Neg, Sub, Index, MulAssign, IndexMut};
 use rand::distributions::{Distribution, Uniform};
 
 #[derive(Debug, Clone, Copy)]
@@ -295,6 +295,16 @@ impl Index<i32> for Vec3 {
         }
     }
 }
+impl IndexMut<i32> for Vec3 {
+    fn index_mut(&mut self, index: i32) -> &mut f64{
+        match index {
+            0 => &mut self.x,
+            1 => &mut self.y,
+            2 => &mut self.z,
+            _ => panic!("Unknown index")
+        }
+    }
+}
 impl Index<usize> for Vec3 {
     type Output = f64;
     fn index(&self, index: usize) -> &Self::Output {