private static HittableList RandomScene()
{
HittableList world = new HittableList();
Material groundMat = new Lambertian(new Colour(0.5f, 0.5f, 0.5f));
world.Add(new Sphere(new Point3(0, -1000, 0), 1000, groundMat));
for (int a = -11; a < 11; a++)
{
for (int b = -11; b < 11; b++)
{
double chooseMat = random.NextDouble();
Point3 centre = new Point3((float)(a + 0.9 * random.NextDouble()), 0.2f, (float)(b + 0.9 * random.NextDouble()));
if ((centre - new Point3(4, 0.2f, 0)).Length() > 0.9f)
{
Material sphereMat;
float radius = random.NextDouble() / 10f + 0.15f;
centre.Y = radius;
if (chooseMat < 0.8f)
{
// Diffuse
Colour albedo = RandVector(0, 1) * RandVector(0, 1);
sphereMat = new Lambertian(albedo);
world.Add(new Sphere(centre, radius, sphereMat));
}
else if (chooseMat < 0.95)
{
// Metal
Colour albedo = RandVector(0.5f, 1);
float fuzz = (float)(random.NextDouble() / 2);
sphereMat = new Metal(albedo, fuzz);
world.Add(new Sphere(centre, radius, sphereMat));
}
else
{
// Glass
sphereMat = new Dielectric(RandFloat(1.3f, 1.7f));
world.Add(new Sphere(centre, radius, sphereMat));
}
}
}
}
Material material1 = new Dielectric(1.5f);
world.Add(new Sphere(new Point3(0, 1, 0), 1.0f, material1));
Material material2 = new Lambertian(new Colour(0.4f, 0.2f, 0.1f));
world.Add(new Sphere(new Point3(-4, 1, 0), 1.0f, material2));
Material material3 = new Metal(new Colour(0.7f, 0.6f, 0.5f), 0.0f);
world.Add(new Sphere(new Point3(4, 1, 0), 1.0f, material3));
return(world);
}
static void Main()
{
// Image
float aspectRatio = 16f / 9f;
int imgWidth = (int)(1920 / 1.5);
int imgHeight = (int)(imgWidth / aspectRatio);
int samplesPerPixel = 64;
int maxDepth = 50;
imgStrs = new List <string> [imgHeight + 1];
// World
HittableList world = RandomScene();
// Camera
Point3 lFrom = new Point3(13, 2, 3);
Point3 lAt = new Point3(0, 0, 0);
Point3 vUp = new Point3(0, 1, 0);
float aperature = 0.1f;
float distToFocus = 10; // (lFrom - lAt).Length();
cam = new Camera(lFrom, lAt, vUp, 20f, aspectRatio, aperature, distToFocus);
int count = 0;
imgStrs[0] = new List <string> {
$"P3\n{imgWidth} {imgHeight}\n255\n"
};
Parallel.For(0, imgHeight, j =>
{
count++;
Console.Write($"\rScanlines remaining: {imgHeight - count} ");
imgStrs[imgHeight - j] = CalcRow(imgWidth, imgHeight, samplesPerPixel, maxDepth, world, j);
});
Console.WriteLine("\nWriting image...");
using (FileStream fs = new FileStream(Directory.GetCurrentDirectory() + "\\output.ppm", FileMode.Create))
{
StreamWriter sr = new StreamWriter(fs);
foreach (List <string> ls in imgStrs)
{
foreach (string s in ls)
{
sr.Write(s);
}
}
sr.Close();
}
Console.WriteLine("Done!");
}
private static List <string> CalcRow(int imgWidth, int imgHeight, int samplesPerPixel, int maxDepth, HittableList world, int j)
{
List <string> res = new List <string>();
for (int i = 0; i < imgWidth; i++)
{
Colour pixelColour = Colour.Zero;
for (int s = 0; s < samplesPerPixel; s++)
{
float u = (float)((i + random.NextDouble()) / (imgWidth - 1));
float v = (float)((j + random.NextDouble()) / (imgHeight - 1));
Ray r = cam.GetRay(u, v);
pixelColour += RayColour(r, world, maxDepth);
}
WriteColour(pixelColour, samplesPerPixel, res);
}
return(res);
}
