public static Hitable_List Random_Scene()
{
Hitable_List world = new Hitable_List();
var ground_material = new Lambertian(new Vector3(0.5f, 0.5f, 0.5f));
world.Add(new Sphere(new Vector3(0, -1000, 0), 1000, ground_material));
for (int a = -11; a < 11; a++)
{
for (int b = -11; b < 11; b++)
{
float choose_mat = (float)Helpers.random.NextDouble();
Vector3 center = new Vector3(a + 0.9f * (float)Helpers.random.NextDouble(), 0.2f, b + 0.9f * (float)Helpers.random.NextDouble());
if ((center - new Vector3(4, 0.2f, 0)).Length() > 0.9f)
{
Material sphere_material;
if (choose_mat < 0.8f)
{
// diffuse
Vector3 albedo = Helpers.RandomVector3(0, 1) * Helpers.RandomVector3(0, 1);
sphere_material = new Lambertian(albedo);
world.Add(new Sphere(center, 0.2f, sphere_material));
}
else if (choose_mat < 0.95f)
{
// metal
Vector3 albedo = Helpers.RandomVector3(0.5f, 1.0f);
float fuzz = Helpers.RandomFloat(0, 0.5f);
sphere_material = new Metal(albedo, fuzz);
world.Add(new Sphere(center, 0.2f, sphere_material));
}
else
{
// glass
sphere_material = new Dielectric(1.5f);
world.Add(new Sphere(center, 0.2f, sphere_material));
}
}
}
}
var material1 = new Dielectric(1.5f);
world.Add(new Sphere(new Vector3(0, 1, 0), 1.0f, material1));
var material2 = new Lambertian(new Vector3(0.4f, 0.2f, 0.1f));
world.Add(new Sphere(new Vector3(-4, 1, 0), 1.0f, material2));
var material3 = new Metal(new Vector3(0.7f, 0.6f, 0.5f), 0.0f);
world.Add(new Sphere(new Vector3(4, 1, 0), 1.0f, material3));
return(world);
}
static void Main(string[] args)
{
float aspect_ratio = 16.0f / 9.0f;
int image_width = 384;
int image_height = (int)(image_width / aspect_ratio);
int samples_per_pixel = 100;
int max_depth = 50;
string filePath = "image.ppm";
using (var file = new StreamWriter(filePath))
{
file.WriteLine($"P3\n{image_width} {image_height}\n255");
float viewport_height = 2.0f;
float viewport_width = aspect_ratio * viewport_height;
float focal_length = 1.0f;
var origin = Vector3.Zero;
var horizontal = new Vector3(viewport_width, 0, 0);
var vertical = new Vector3(0, viewport_height, 0);
var lower_left_corner = origin - horizontal / 2 - vertical / 2 - new Vector3(0, 0, focal_length);
Hitable_List world = Random_Scene();
Vector3 lookfrom = new Vector3(13, 2, 3);
Vector3 lookat = new Vector3(0, 0, 0);
Vector3 vup = new Vector3(0, 1, 0);
float dist_to_focus = 10.0f;
float aperture = 0.1f;
Camera cam = new Camera(lookfrom, lookat, vup, 20, aspect_ratio, aperture, dist_to_focus);
for (int j = image_height - 1; j >= 0; --j)
{
Console.WriteLine($"\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, world, max_depth);
}
Write_color(file, pixel_color, samples_per_pixel);
}
}
Console.WriteLine("Done.");
}
}