Add images

.gitignore

@@ -1,6 +1,6 @@
 /target
-*.ppm
-*.jpg
-*.png
+/*.ppm
+/*.jpg
+/*.png
 flamegraph.svg
 perf.data*

README.md

@@ -1,5 +1,13 @@
 # Renderer - Grafik-AG
 
+Following [Raytracing In One Weekend](https://raytracing.github.io/books/RayTracingInOneWeekend.html).
+
+Rendered images in `images/`.
+
+![RaytracingInOneWeekend](images/RayTracingInOneWeekend2.png)
+
+![Suzanne Rainbow](images/suzanne_rainbow.png)
+
 ***
 ### Performance analysis with Flamegraph
 https://github.com/flamegraph-rs/flamegraph

src/color.rs

@@ -5,10 +5,10 @@ pub fn put_color(img: &mut RgbImage, pixel_color: &Color, x: u32, y: u32, sample
     let mut g = pixel_color.y();
     let mut b = pixel_color.z();
 
-    let scale = 1.0 / samples_per_pixel as f64;
-    r = (scale * r).sqrt();
-    g = (scale * g).sqrt();
-    b = (scale * b).sqrt();
+    //let scale = 1.0 / samples_per_pixel as f64;
+    //r = r/samples_per_pixel as f64; //(scale * r).sqrt();
+    //g = g/samples_per_pixel as f64; //(scale * g).sqrt();
+    //b = b/samples_per_pixel as f64; //(scale * b).sqrt();
 
     img.put_pixel(
         x,

src/main.rs

@@ -292,33 +292,33 @@ Current world view:
     / z             \ x
 
 */
-
 fn main() {
     // File
     let mut default_file = "image.ppm";
 
     // Image
-    let aspect_ratio = 10.0/7.5; //16.0 / 9.0;
-    let image_width = 1000;
+    let aspect_ratio = 10.0 / 7.5; //16.0 / 9.0;
+    let image_width = 400;
     let image_height = (image_width as f64 / aspect_ratio) as u32;
-    let samples_per_pixel = 100_u32;
+    let samples_per_pixel = 50_u32;
     let max_depth = 50;
+    let antialiasing_threshold = 0.3; // at what diff between two colors will a pixel be antialiased
 
     let vfov = 40.0;
     let lookfrom = Point3::new(2.0, 0.8, 3.0);
     let lookat = Point3::new(0.0, 0.0, 0.0);
     let vup = Vec3::new(0.0, 1.0, 0.0);
     let dist_to_focus = 3.0;
-    let aperture = 0.1;
+    let aperture = 0.0; // disable depth of field
 
     // limit rayon multithreading thread count
-    let thread_count = 6; // if 0, for each logical cpu core a thread wil be created
+    let thread_count = 4; // if 0, for each logical cpu core a thread wil be created
     if thread_count > 0 {
         env::set_var("RAYON_NUM_THREADS", thread_count.to_string());
     }
 
     // World
-    eprintln!("[1/3] Loading meshes from file...");
+    eprintln!("[1/4] Loading meshes from file...");
     let world = from_obj("obj/suzanne.obj");
     // let world = random_world();
 
@@ -339,7 +339,7 @@ fn main() {
         default_file = &args[1];
     }
 
-    eprintln!("[2/3] Gerenating image...");
+    eprintln!("[2/4] Generating image...");
     let bar = ProgressBar::new(image_height as u64);
 
     let mut image = RgbImage::new(image_width, image_height);
@@ -353,20 +353,14 @@ fn main() {
 
             let mut colors = Vec::new();
             for i in 0..image_width {
-                let mut pixel_color = ray_color(
+                let pixel_color = ray_color(
                     &cam.get_ray(
                         i as f64 / (image_width - 1) as f64,
                         j as f64 / (image_height - 1) as f64,
                     ),
                     &world,
                     max_depth,
-                ); // first ray not antialiased to disable antialiasing on value 1
-                for _ in 1..samples_per_pixel {
-                    let u = (i as f64 + utility::random_f64()) / (image_width - 1) as f64;
-                    let v = (j as f64 + utility::random_f64()) / (image_height - 1) as f64;
-                    let r = cam.get_ray(u, v);
-                    pixel_color += ray_color(&r, &world, max_depth);
-                }
+                );
                 colors.push(pixel_color);
             }
             return colors;
@@ -374,15 +368,99 @@ fn main() {
         .collect();
     bar.finish_and_clear();
 
-    eprintln!("[3/3] Exporting image to disk...");
+    eprintln!("[3/4] Antialiasing image...");
+    let mut antialiasing: Vec<Vec<bool>> = Vec::new();
+    let mut antialiasing_counter = 0;
+    let mut antialiasing_col_counter = 0;
+    let mut antialiases_per_line: Vec<u64> = Vec::new();
+    (0..image_height).into_iter().for_each(|j| {
+        antialiasing.push(Vec::new());
+        (0..image_width).into_iter().for_each(|i| {
+            if j != 0
+                && Color::diff(
+                    &color_lines[(j - 1) as usize][i as usize],
+                    &color_lines[j as usize][i as usize],
+                ) >= antialiasing_threshold
+            {
+                antialiasing[j as usize].push(true);
+                antialiasing_col_counter += 1;
+            } else if j != image_height - 1
+                && Color::diff(
+                    &color_lines[(j + 1) as usize][i as usize],
+                    &color_lines[j as usize][i as usize],
+                ) >= antialiasing_threshold
+            {
+                antialiasing[j as usize].push(true);
+                antialiasing_col_counter += 1;
+            } else if i != 0
+                && Color::diff(
+                    &color_lines[j as usize][(i - 1) as usize],
+                    &color_lines[j as usize][i as usize],
+                ) >= antialiasing_threshold
+            {
+                antialiasing[j as usize].push(true);
+                antialiasing_col_counter += 1;
+            } else if i != image_width - 1
+                && Color::diff(
+                    &color_lines[j as usize][(i + 1) as usize],
+                    &color_lines[j as usize][i as usize],
+                ) >= antialiasing_threshold
+            {
+                antialiasing[j as usize].push(true);
+                antialiasing_col_counter += 1;
+            }
+            if antialiasing[j as usize].len() < (i + 1) as usize {
+                antialiasing[j as usize].push(false);
+            }
+        });
+        antialiases_per_line.push(antialiasing_col_counter);
+        antialiasing_counter += antialiasing_col_counter;
+        antialiasing_col_counter = 0;
+    });
+
+    let bar = ProgressBar::new(antialiasing_counter as u64);
+    let color_lines_antialiased: Vec<_> = (0..image_height)
+        .into_par_iter() // threadded/parallel variant
+        //.into_iter()  // iterative variant
+        .map(|j| {
+            let mut colors = Vec::new();
+            for i in 0..image_width {
+                if samples_per_pixel > 0 && antialiasing[j as usize][i as usize] {
+                    let mut pixel_color = Color::null();
+                    for _ in 0..samples_per_pixel {
+                        let u = (i as f64 + utility::random_f64()) / (image_width - 1) as f64;
+                        let v = (j as f64 + utility::random_f64()) / (image_height - 1) as f64;
+                        let r = cam.get_ray(u, v);
+                        dbg!(ray_color(&r, &world, max_depth));
+                        pixel_color += ray_color(&r, &world, max_depth);
+                    }
+                    // Correct antialiasing gamma
+                    pixel_color = Color::new(
+                        pixel_color.x() / samples_per_pixel as f64,
+                        pixel_color.y() / samples_per_pixel as f64,
+                        pixel_color.z() / samples_per_pixel as f64,
+                    );
+                    println!("x: {}, y: {}, z: {}", pixel_color.x(), pixel_color.y(), pixel_color.z());
+                    colors.push(pixel_color);
+                } else {
+                    colors.push(color_lines[j as usize][i as usize]);
+                }
+            }
+            bar.inc(antialiases_per_line[j as usize]);
+            return colors;
+        })
+        .collect();
+    bar.finish_and_clear();
+
+    eprintln!("[4/4] Exporting image to disk...");  
     (0..image_height).into_iter().rev().for_each(|j| {
         (0..image_width).into_iter().for_each(|i| {
             color::put_color(
                 &mut image,
-                &color_lines[(image_height - j - 1) as usize][i as usize],
+                &color_lines_antialiased[(image_height - j - 1) as usize][i as usize],
                 i,
                 image_height - j - 1,
-                samples_per_pixel,
+                1,
             );
         })
     });

src/material.rs

@@ -17,9 +17,7 @@ pub struct Dielectric {
     ir: f64,
 }
 
-pub struct Rainbow {
-
-}
+pub struct Rainbow {}
 
 pub trait Material: Sync + Send {
     fn scatter(
@@ -183,10 +181,11 @@ impl Material for Rainbow {
         }
 
         *scattered = Ray::new(rec.p, scatter_direction);
-        let color = 0.5*Color::new(
-            rec.normal.x()+1.0,
-            rec.normal.y()+1.0,
-            rec.normal.z()+1.0
+        let color = 0.5
+            * Color::new(
+                rec.normal.x() + 1.0,
+                rec.normal.y() + 1.0,
+                rec.normal.z() + 1.0,
             );
         *attenuation = color;
         return true;

src/vec3.rs

@@ -30,6 +30,10 @@ impl Vec3 {
         self.e[0] * self.e[0] + self.e[1] * self.e[1] + self.e[2] * self.e[2]
     }
 
+    pub fn diff(a: &Self, b: &Self) -> f64 {
+        (a.x() - b.x()).abs() + (a.y() - b.y()).abs() + (a.z() - b.z()).abs()
+    }
+
     pub fn cross(a: Vec3, b: Vec3) -> Vec3 {
         Vec3::new(
             a.y() * b.z() - a.z() * b.y(),