feat: new render

src/main.cc

@@ -3,33 +3,62 @@
 #include "sphere.hh"
 
 int main() {
-
   hittable_list world;
 
-  auto mat_ground = make_shared<lambertian>(color(0.6, 0.7, 0.3));
-  auto mat_center = make_shared<lambertian>(color(0.1, 0.2, 0.5));
-  auto mat_left = make_shared<dielectric>(1.33);
-  auto mat_right = make_shared<metal>(color(0.83, 0.68, 0.22), 1);
+  auto ground_material = make_shared<lambertian>(color(0.5, 0.5, 0.5));
+  world.add(make_shared<sphere>(point3(0, -1000, 0), 1000, ground_material));
+
+  for (int a = -11; a < 11; a++) {
+    for (int b = -11; b < 11; b++) {
+      auto choose_mat = random_double();
+      point3 center(a + 0.9 * random_double(), 0.2, b + 0.9 * random_double());
+
+      if ((center - point3(4, 0.2, 0)).length() > 0.9) {
+        shared_ptr<material> sphere_material;
+
+        if (choose_mat < 0.8) {
+          // diffuse
+          auto albedo = color::random() * color::random();
+          sphere_material = make_shared<lambertian>(albedo);
+          world.add(make_shared<sphere>(center, 0.2, sphere_material));
+        } else if (choose_mat < 0.95) {
+          // metal
+          auto albedo = color::random(0.5, 1);
+          auto fuzz = random_double(0, 0.5);
+          sphere_material = make_shared<metal>(albedo, fuzz);
+          world.add(make_shared<sphere>(center, 0.2, sphere_material));
+        } else {
+          // glass
+          sphere_material = make_shared<dielectric>(1.5);
+          world.add(make_shared<sphere>(center, 0.2, sphere_material));
+        }
+      }
+    }
+  }
+
+  auto material1 = make_shared<dielectric>(1.5);
+  world.add(make_shared<sphere>(point3(0, 1, 0), 1.0, material1));
+
+  auto material2 = make_shared<lambertian>(color(0.4, 0.2, 0.1));
+  world.add(make_shared<sphere>(point3(-4, 1, 0), 1.0, material2));
 
-  world.add(make_shared<sphere>(point3(0.0, -100.5, -1.0), 100.0, mat_ground));
-  world.add(make_shared<sphere>(point3(0.0, 0.0, -1.2), 0.5, mat_center));
-  world.add(make_shared<sphere>(point3(-1.0, 0.0, -1.0), 0.5, mat_left));
-  world.add(make_shared<sphere>(point3(1.0, 0.0, -1.0), 0.5, mat_right));
+  auto material3 = make_shared<metal>(color(0.7, 0.6, 0.5), 0.0);
+  world.add(make_shared<sphere>(point3(4, 1, 0), 1.0, material3));
 
   camera cam;
 
   cam.aspect_ratio = 16.0 / 9.0;
   cam.image_width = 1920;
   cam.samples_per_pixel = 100;
-  cam.max_depth = 50;
+  cam.max_depth = 10;
 
-  cam.vfov = 45;
-  cam.lookfrom = point3(-3, 0, 1);
-  cam.lookat = point3(2, 0, -2.5);
-  cam.vup = point3(-0.1, 1, 0.1);
+  cam.vfov = 20;
+  cam.lookfrom = point3(13, 2, 3);
+  cam.lookat = point3(0, 0, 0);
+  cam.vup = vec3(0, 1, 0);
 
-  cam.defocus_angle = 0.3;
-  cam.focus_dist = 3;
+  cam.defocus_angle = 0.6;
+  cam.focus_dist = 10.0;
 
   cam.render(world);
 }