static public hitable_list random_scene()
{
var n = 500;
var list = new hitable_list();
list.Add(new sphere(new Vector3(0, -1000, -0), 1000, new lambertian(new Color(0.5f, 0.5f, 0.5f))));
for (var a = -11; a < 11; a++)
{
for (var b = -11; b < 11; b++)
{
var choose_mat = Random.value;
var center = new Vector3(a + 0.9f * Random.value, 0.2f, b + 0.9f * Random.value);
if (choose_mat < 0.8f) // diffuse
{
list.Add(new sphere(center, 0.2f, new lambertian(new Color(Random.value * Random.value, Random.value * Random.value, Random.value * Random.value))));
}
else if (choose_mat < 0.95f) // metal
{
list.Add(new sphere(center, 0.2f, new metal(new Color(0.5f * (Random.value + 1), .5f * (Random.value + 1), .5f * (Random.value + 1)), 1)));
}
else // glass
{
list.Add(new sphere(center, 0.2f, new dielectric(1.5f)));
}
}
}
list.Add(new sphere(new Vector3(0, 1, 0), 1, new dielectric(1.5f)));
list.Add(new sphere(new Vector3(-4, 1, 0), 1, new lambertian(new Color(0.4f, 0.2f, 0.1f))));
list.Add(new sphere(new Vector3(4, 1, 0), 1, new metal(new Color(0.7f, 0.6f, 0.5f), 0)));
return(list);
}
static private Color color(Ray r, hitable_list world, int depth)
{
hit_record rec;
UnityEngine.Profiling.Profiler.BeginSample("hit");
var isHit = world.hit(r, 0.001f, float.MaxValue, out rec);
UnityEngine.Profiling.Profiler.EndSample();
if (isHit)
{
Ray scatteded;
Color attenuation;
if (depth < 50)
{
UnityEngine.Profiling.Profiler.BeginSample("scattter");
var b = rec.mat.scatter(r, rec, out attenuation, out scatteded);
UnityEngine.Profiling.Profiler.EndSample();
if (b)
{
return(attenuation * color(scatteded, world, depth + 1));
}
else
{
return(Color.black);
}
}
else
{
return(Color.black);
}
}
else
{
var unit_direction = r.direction().normalized;
var t = 0.5f * (unit_direction.y + 1.0f);
return((1.0f - t) * (new Color(1, 1, 1)) + t * (new Color(0.5f, 0.7f, 1.0f)));
}
}
static private Color color(Ray r, hitable_list world, int depth)
{
hit_record rec;
if (world.hit(r, 0.001f, float.MaxValue, out rec))
{
Ray scatteded;
Color attenuation;
if (depth < 50 && rec.mat.scatter(r, rec, out attenuation, out scatteded))
{
return(attenuation * color(scatteded, world, depth + 1));
}
else
{
return(Color.black);
}
}
else
{
var unit_direction = r.direction().normalized;
var t = 0.5f * (unit_direction.y + 1.0f);
return((1.0f - t) * (new Color(1, 1, 1)) + t * (new Color(0.5f, 0.7f, 1.0f)));
}
}
