static void Main(string[] args)
{
int image_width = 384;
int image_height = 384;
float aspect_ratio = (float)image_width / image_height;
int samples_per_pixel = 100;
int max_depth = 50;
string filePath = "image.ppm";
using (var file = new StreamWriter(filePath))
{
file.WriteLine($"P3\n{image_width} {image_height}\n255");
float viewport_height = 2.0f;
float viewport_width = aspect_ratio * viewport_height;
float focal_length = 1.0f;
var origin = Vector3.Zero;
var horizontal = new Vector3(viewport_width, 0, 0);
var vertical = new Vector3(0, viewport_height, 0);
var lower_left_corner = origin - horizontal / 2 - vertical / 2 - new Vector3(0, 0, focal_length);
Hitable_List world = Cornell_box();
Vector3 lookfrom = new Vector3(278, 278, -800);
Vector3 lookat = new Vector3(278, 278, 0);
Vector3 vup = new Vector3(0, 1, 0);
float dist_to_focus = 10.0f;
float aperture = 0.0f;
float vfov = 40.0f;
Vector3 background = new Vector3(0.0f, 0.0f, 0.0f);
Camera cam = new Camera(lookfrom, lookat, vup, vfov, aspect_ratio, aperture, dist_to_focus, 0.0f, 1.0f);
for (int j = image_height - 1; j >= 0; --j)
{
Console.WriteLine($"\rScanlines remaining: {j}");
for (int i = 0; i < image_width; ++i)
{
Vector3 pixel_color = Vector3.Zero;
for (int s = 0; s < samples_per_pixel; ++s)
{
float u = (float)(i + Helpers.random.NextDouble()) / (image_width - 1);
float v = (float)(j + Helpers.random.NextDouble()) / (image_height - 1);
Ray r = cam.Get_Ray(u, v);
pixel_color += Ray_color(r, background, world, max_depth);
}
Write_color(file, pixel_color, samples_per_pixel);
}
}
Console.WriteLine("Done.");
}
}
public static Hitable_List Cornell_box()
{
Hitable_List objects = new Hitable_List();
var red = new Lambertian(new Solid_Color(.65f, .05f, .05f));
var white = new Lambertian(new Solid_Color(.73f, .73f, .73f));
var green = new Lambertian(new Solid_Color(.12f, .45f, .15f));
var light = new Diffuse_light(new Solid_Color(15, 15, 15));
objects.Add(new Flip_face(new YZ_rect(0, 555, 0, 555, 555, green)));
objects.Add(new YZ_rect(0, 555, 0, 555, 0, red));
objects.Add(new XZ_rect(213, 343, 227, 332, 554, light));
objects.Add(new Flip_face(new XZ_rect(0, 555, 0, 555, 0, white)));
objects.Add(new XZ_rect(0, 555, 0, 555, 555, white));
objects.Add(new Flip_face(new XY_rect(0, 555, 0, 555, 555, white)));
objects.Add(new Box(new Vector3(130, 0, 65), new Vector3(295, 165, 230), white));
objects.Add(new Box(new Vector3(265, 0, 295), new Vector3(430, 330, 460), white));
return(objects);
}
public BVH_Node(Hitable_List list, float time0, float time1)
: this(list.Objects, 0, (uint)list.Objects.Count, time0, time1)
{
}
public Box()
{
this.sides = new Hitable_List();
}
