private HitableList GenerateWorld(Random rng)
{
UnitSphereUniformSampler sphereSampler = new UnitSphereUniformSampler(rng);
List <IHitable> objects = new List <IHitable>();
// Add the main earth object
IMaterial earthMaterial = new Lambertian(new Vector3(0.5, 0.5, 0.5), sphereSampler);
objects.Add(new Sphere(new Vector3(0, -1000, 0), 1000, earthMaterial));
// Generate random objects
Vector3 temp = new Vector3(4, 0.2, 0);
for (int a = -11; a < 11; ++a)
{
for (int b = -11; b < 11; ++b)
{
double chooseMat = rng.NextDouble();
Vector3 center = new Vector3(a + 0.9 * rng.NextDouble(), 0.2, b + 0.9 * rng.NextDouble());
if ((center - temp).Length() > 0.9)
{
// 80% chance to choose diffuse
if (chooseMat < 0.8)
{
double red = rng.NextDouble() * rng.NextDouble();
double green = rng.NextDouble() * rng.NextDouble();
double blue = rng.NextDouble() * rng.NextDouble();
var randomDiffuseMaterial = new Lambertian(
new Vector3(red, green, blue),
sphereSampler);
objects.Add(new Sphere(center, 0.2, randomDiffuseMaterial));
}
else if (chooseMat < 0.95)
{
// 15% chance for metal material
double red = 0.5 * (1 + rng.NextDouble());
double green = 0.5 * (1 + rng.NextDouble());
double blue = 0.5 * (1 + rng.NextDouble());
double fuzz = 0.5 * rng.NextDouble();
var randomMetal = new Metal(new Vector3(red, green, blue), fuzz, sphereSampler);
objects.Add(new Sphere(center, 0.2, randomMetal));
}
else
{
// 5% chance for dielectric
objects.Add(new Sphere(center, 0.2, new Dielectric(1.5, rng)));
}
}
}
}
objects.Add(new Sphere(new Vector3(0, 1, 0), 1.0, new Dielectric(1.5, rng)));
objects.Add(new Sphere(new Vector3(-4, 1, 0), 1.0, new Lambertian(new Vector3(0.4, 0.2, 0.1), sphereSampler)));
objects.Add(new Sphere(new Vector3(4, 1, 0), 1.0, new Metal(new Vector3(0.7, 0.6, 0.5), 0.0, sphereSampler)));
return(new HitableList(objects));
}
public Metal(Vector3 a, double fuzz, UnitSphereUniformSampler sampler)
{
this.albedo = a;
this.fuzz = fuzz;
this.sampler = sampler;
}
public Lambertian(Vector3 albedo, UnitSphereUniformSampler sampler)
{
this.albedo = albedo;
this.sampler = sampler;
}
public void RenderScene()
{
int nx = 800;
int ny = 400;
int ns = 100;
var lowerLeftCorner = new Vector3(-2.0, -1.0, -1.0);
var horizontal = new Vector3(4.0, 0.0, 0.0);
var vertical = new Vector3(0.0, 2.0, 0.0);
var origin = new Vector3(0.0, 0.0, 0.0);
Random rng = new Random();
UnitSphereUniformSampler sphereSampler = new UnitSphereUniformSampler(rng);
UnitCircleUniformSampler circleSampler = new UnitCircleUniformSampler(rng);
IMaterial mat1 = new Lambertian(new Vector3(0.1, 0.2, 0.5), sphereSampler);
IMaterial mat2 = new Lambertian(new Vector3(0.8, 0.8, 0.0), sphereSampler);
IMaterial mat3 = new Metal(new Vector3(0.8, 0.6, 0.2), 0.3, sphereSampler);
IMaterial mat4 = new Dielectric(1.5, rng);
List <IHitable> objects = new List <IHitable>(4);
objects.Add(new Sphere(new Vector3(0, 0, -1), 0.5, mat1));
objects.Add(new Sphere(new Vector3(0, -100.5, -1), 100, mat2));
objects.Add(new Sphere(new Vector3(1, 0, -1), 0.5, mat3));
objects.Add(new Sphere(new Vector3(-1, 0, -1), 0.5, mat4));
objects.Add(new Sphere(new Vector3(-1, 0, -1), -0.45, mat4));
HitableList world = new HitableList(objects);
Vector3 lookFrom = new Vector3(-2, 2, 1);
Vector3 lookAt = new Vector3(0, 0, -1);
Camera camera = new Camera(
circleSampler,
lookFrom,
lookAt,
new Vector3(0, 1, 0),
90.0 * Math.PI / 180.0,
(double)nx / (double)ny,
0.2,
(lookAt - lookFrom).Length());
Random random = new Random();
// Create folder to output frames
if (!Directory.Exists("ThreeSpheres"))
{
Directory.CreateDirectory("ThreeSpheres");
}
Sensor sensor = new Sensor(nx, ny, new SqrtColorSpace(), RGBColor.Black);
int frameNum = 0;
for (int s = 0; s < ns; ++s)
{
for (int j = ny - 1; j >= 0; --j)
{
for (int i = 0; i < nx; i++)
{
double u = (i + random.NextDouble()) / nx;
double v = (j + random.NextDouble()) / ny;
Ray3 r = new Ray3(camera.GetRay(u, v));
Vector3 color = Program.Color(r, world, 0);
sensor.AddSample(i, j, new RGBColor(color[0], color[1], color[2]));
}
}
if (s % (ns / 10) == 0)
{
// Output 1 frame with current number of samples
sensor.WritePPMFile($"ThreeSpheres\\frame_{frameNum}.ppm").Wait();
frameNum++;
}
Console.Write("\r{0}", s);
}
sensor.WritePPMFile("finalOutput.ppm").Wait();
}
