added emitting material and 2nd example render

README.md

@@ -2,3 +2,4 @@
 ![Build](https://git.veltko.de/plexx-dev/raychel-rs/actions/workflows/build.yml/badge.svg?branch=main&event=push&style=flat-square)
 ### quick and dirty multithreaded raymarcher using the awesome [_Ray Tracing in One Weekend_](https://raytracing.github.io/books/RayTracingInOneWeekend.html) Book Series
 ![Example Scene](example.png)
+![Example Dark Scene](example_dark.png)

src/camera.rs

@@ -73,21 +73,24 @@ impl Camera {
         }
 
         if let Some(rec) = world.hit(&r, 0.001, f64::INFINITY) {
+            let emitted = rec.material.emitted();
             let mut scattered = Ray::new_empty();
             let mut attenuation = Color::new_empty();
 
             if rec
                 .material
-                .scatter(r, rec, &mut attenuation, &mut scattered)
+                .scatter(r, rec.clone(), &mut attenuation, &mut scattered)
             {
-                return attenuation * Self::ray_color(&self, scattered, world, depth - 1);
+                return emitted + attenuation * self.ray_color(scattered, world, depth - 1);
+            } else {
+                return emitted;
             }
-            return Color::new_empty();
         }
 
-        let unit_direction: Vec3 = r.direction().unit_vector();
-        let t = 0.5 * (unit_direction.y() + 1.0);
-
-        ((1.0 - t) * Color::new(1.0, 1.0, 1.0)) + (t * Color::new(0.5, 0.7, 1.0))
+        // Sky background
+        // let unit_direction: Vec3 = r.direction().unit_vector();
+        // let t = 0.5 * (unit_direction.y() + 1.0);
+        //((1.0 - t) * Color::new(1.0, 1.0, 1.0)) + (t * Color::new(0.5, 0.7, 1.0))
+        Color::new_empty()
     }
 }

src/main.rs

@@ -10,7 +10,7 @@ pub mod vec3;
 
 use std::{f64, thread::available_parallelism};
 
-use image::{Pixel, RgbImage};
+use image::RgbImage;
 use indicatif::{ProgressBar, ProgressStyle};
 use rayon::prelude::*;
 
@@ -74,6 +74,13 @@ fn random_scene(aspect_ratio: f64) -> (Camera, HittableList) {
         }
     }
 
+    let material0  = Light::new(Color::new(15., 15., 15.));
+    world.add(Box::new(Sphere::new(
+        Point3::new(-1.0, 1.0, 0.0),
+        1.0,
+        Box::new(material0),
+    )));
+
     let material1: Dielectric = Dielectric::new(1.5);
     world.add(Box::new(Sphere::new(
         Point3::new(0.0, 1.0, 0.0),
@@ -179,10 +186,10 @@ fn three_balls_scene(aspect_ratio: f64) -> (Camera, HittableList) {
 fn main() {
     // Image
     let aspect_ratio: f64 = 16. / 9.;
-    let image_width: i32 = 500;
+    let image_width: i32 = 1920;
     let image_height: i32 = (image_width as f64 / aspect_ratio as f64) as i32;
-    let samples_per_pixel: i32 = 50;
-    let max_depth: i32 = 4;
+    let samples_per_pixel: i32 = 400;
+    let max_depth: i32 = 10;
 
     let (cam, world) = random_scene(aspect_ratio);
 

src/material.rs

@@ -16,6 +16,10 @@ use crate::vec3::{random_unit_vector, reflect, refract, Color};
 */
 
 pub trait Material: Send + Sync {
+    fn emitted(&self) -> Color {
+        Color::new(0.0, 0.0, 0.0)
+    }
+
     fn scatter(
         &self,
         r_in: Ray,
@@ -134,3 +138,29 @@ impl Material for Dielectric {
         true
     }
 }
+
+pub struct Light {
+    emit: Color
+}
+
+impl Light {
+    pub const fn new(emit: Color) -> Self {
+        Light { emit }
+    }
+}
+
+impl Material for Light {
+    fn scatter(
+        &self,
+        _r_in: Ray,
+        _rec: HitRecord,
+        _attenuation: &mut Color,
+        _scattered: &mut Ray,
+    ) -> bool {
+        false // Light sources dont scatter rays
+    }
+
+    fn emitted(&self) -> Color {
+        self.emit
+    }
+}