Added Computer Graphics assignment dhruv_mehrotra

Graphics/dhruv_mehrotra/camera.h

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+    #ifndef CAMERA_H
+    #define CAMERA_H
+
+    #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, 0.0);
+                vertical = vec3(0.0, viewport_height, 0.0);
+                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;
+    };
+    #endif

Graphics/dhruv_mehrotra/chap3.cpp

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+    #include "color.h"
+    #include "ray.h"
+    #include "vec3.h"
+
+    #include <iostream>
+
+
+    color ray_color(const ray& r) {
+        vec3 unit_direction = unit_vector(r.direction());
+        auto t = 0.5*(unit_direction.y() + 1.0);
+        return (1.0-t)*color(1.0, 1.0, 1.0) + t*color(0.5, 0.7, 1.0);
+    }
+
+    int main() {
+
+        // Image
+
+        const auto aspect_ratio = 16.0 / 9.0;
+        const int image_width = 400;
+        const int image_height = static_cast<int>(image_width / aspect_ratio);
+
+        // 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);
+
+        // Render
+
+        std::cout << "P3\n" << image_width << " " << image_height << "\n255\n";
+
+        for (int j = image_height-1; j >= 0; --j) {
+            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);
+                write_color(std::cout, pixel_color);
+            }
+        }
+
+        std::cerr << "\nDone.\n";
+    }