public static Hitable my_random_scene()
{
int max_items = 500;
List <Hitable> list = new List <Hitable>(max_items + 1);
list.Add(new Sphere(new Vec3(0.0f, -1000.0f, 0.0f), 1000.0f, new Lambertian(TextureLib.green_white_checker)));
if (true)
{
for (int a = -11; a < 11; a++)
{
for (int b = -11; b < 11; b++)
{
float choose_mat = Rng.f();
Vec3 center = new Vec3((float)a + 0.8f * Rng.f(), 0.2f, (float)b + 0.8f * Rng.f());
if ((center - new Vec3(4.0f, 0.2f, 0.0f)).length() > 1.5f &&
(center - new Vec3(0.0f, 0.2f, 0.0f)).length() > 1.5f &&
(center - new Vec3(-4.0f, 0.2f, 0.0f)).length() > 1.5f)
{
if (choose_mat < 0.8f)
{
list.Add(new Sphere(center, 0.2f, new Lambertian(new ConstantTexture(new Vec3(Rng.f(), Rng.f(), Rng.f())))));
}
else if (choose_mat < 0.95f)
{
list.Add(new Sphere(center, 0.2f,
new Metal(new Vec3(0.5f * (1.0f + Rng.f()), 0.5f * (1.0f + Rng.f()), 0.5f * (1.0f + Rng.f())),
0.5f * Rng.f())));
}
else
{
list.Add(new Sphere(center, 0.2f, new Dielectric(1.5f)));
}
}
}
}
}
list.Add(new Sphere(new Vec3(0.0f, 1.0f, 0.0f), 1.0f, new Dielectric(1.5f, new Vec3(1.0f, 1.0f, 1.0f))));
list.Add(new Sphere(new Vec3(-4.0f, 1.0f, 0.0f), 1.0f, new Lambertian(TextureLib.burnt_sienna)));
list.Add(new Sphere(new Vec3(4.0f, 1.0f, 0.0f), 1.0f, new Metal(new Vec3(0.7f, 0.6f, 0.5f), 0.0f)));
int i = list.Count();
return(new Hitable_List(list, i));
}