diff --git a/README.md b/README.md index 7d59e33..b9324ca 100644 --- a/README.md +++ b/README.md @@ -5,4 +5,4 @@ -### Original author Post: https://raytracing.github.io/books/RayTracingInOneWeekend.html#overview \ No newline at end of file +### Original author Post: https://raytracing.github.io/books/RayTracingInOneWeekend.html \ No newline at end of file diff --git a/src/camera.h b/src/camera.h new file mode 100644 index 0000000..f6e4c0c --- /dev/null +++ b/src/camera.h @@ -0,0 +1,27 @@ +#pragma once +#include "rtweekend.h" + +class camera{ + public: + camera(){ + auto aspect_ratio = 16.0 / 9.0; + auto viewport_height = 2.0; + auto viewport_width = aspect_ratio * viewport_height; + auto focal_length = 1.0; + + origin = point3(0,0,0); + horizontal = vec3(viewport_width, 0, 0); + vertical = vec3(0, viewport_height, 0); + lower_left_corner = origin - horizontal/2 - vertical/2 - vec3(0,0,focal_length); + } + + ray get_ray(double u, double v) const { + return ray(origin, lower_left_corner + u * horizontal + v*vertical - origin); + } + + private: + point3 origin; + point3 lower_left_corner; + vec3 horizontal; + vec3 vertical; +}; diff --git a/src/color.h b/src/color.h index a04d078..04534eb 100644 --- a/src/color.h +++ b/src/color.h @@ -3,10 +3,21 @@ #include -void write_color(std::ostream& out, color pixel_color){ - // Write the translated [0, 255] value of each color component +void write_color(std::ostream& out, color pixel_color, int samples_per_pixel){ + auto r = pixel_color.x(); + auto g = pixel_color.y(); + auto b = pixel_color.z(); - out << static_cast( 255.999 * pixel_color.x()) << ' ' - << static_cast ( 255.999 * pixel_color.y()) << ' ' - << static_cast ( 255.999 * pixel_color.z()) << '\n'; + // Divide the color by the number of samples + auto scale = 1.0 / samples_per_pixel; + r *= scale; + g *= scale; + b *= scale; + + + + // Write the translated [0, 255] value of each color component + out << static_cast( 256 * clamp(r, 0.0, 0.9999)) << ' ' + << static_cast ( 256 * clamp(g, 0.0, 0.9999)) << ' ' + << static_cast ( 256 * clamp(b, 0.0, 0.9999)) << '\n'; } \ No newline at end of file diff --git a/src/program.cpp b/src/program.cpp index 1468ead..1fdafbd 100644 --- a/src/program.cpp +++ b/src/program.cpp @@ -1,5 +1,6 @@ #include "rtweekend.h" +#include "camera.h" #include "color.h" #include "hittable_list.h" #include "sphere.h" @@ -24,6 +25,7 @@ int main () const auto aspect_ratio = 16.0 /9.0; const int image_width = 400; const int image_height = static_cast(image_width /aspect_ratio); + const int samples_per_pixel = 100; // World hittable_list world; @@ -32,14 +34,7 @@ int main () // Camera - auto viewport_height = 2.0; - auto viewport_width = aspect_ratio * viewport_height; - auto focal_length = 1.0; - - auto origin = point3(0,0,0); - auto horizontal = vec3(viewport_width, 0, 0); - auto vertical = vec3(0, viewport_height, 0); - auto lower_left_corner = origin - horizontal/2 - vertical/2 - vec3(0,0,focal_length); + camera cam; // Render std::cout<< "P3\n" << image_width << ' ' << image_height << "\n255\n"; @@ -48,11 +43,15 @@ int main () std::cerr << "\rScanlines remaining: " << j << ' ' << std::flush; for(int i = 0; i < image_width; ++i) { - auto u = double(i) / (image_width-1); - auto v = double(j) / (image_height-1); - ray r(origin, lower_left_corner+u*horizontal + v* vertical -origin); - color pixel_color = ray_color(r, world); - write_color(std::cout , pixel_color); + color pixel_color(0,0,0); + for(int s = 0; s < samples_per_pixel; ++s){ + auto u = (i + random_double()) / (image_width-1); + auto v = (j + random_double()) / (image_height-1); + ray r = cam.get_ray(u,v); + pixel_color += ray_color(r, world); + } + + write_color(std::cout, pixel_color, samples_per_pixel); } } diff --git a/src/rtweekend.h b/src/rtweekend.h index 1e39604..4c86689 100644 --- a/src/rtweekend.h +++ b/src/rtweekend.h @@ -3,6 +3,7 @@ #include #include #include +#include // Usings using std::shared_ptr; @@ -19,6 +20,20 @@ inline double degrees_to_radians(double degrees){ return degrees * pi / 180.0; } +inline double random_double(){ + return rand() / (RAND_MAX + 1.0); +} + +inline double random_double(double min, double max){ + return min + (max-min)*random_double(); +} + +inline double clamp(double x, double min, double max){ + if(x < min) return min; + if(x > max) return max; + return x; +} + // Common Headers #include "ray.h" #include "vector3.h"