public static Color3D Color(Ray r, Hitable world, int depth)
{
HitRecord rec = new HitRecord();
if (world.Hit(r, 0.001, double.MaxValue, ref rec))
{
Ray scattered = new Ray();
Vector3 attenuation = new Vector3();
if (depth < 50 && rec.Material.Scatter(r, rec, ref attenuation, ref scattered))
{
Color3D colorTemp = Color(scattered, world, depth + 1);
colorTemp.R *= attenuation.X;
colorTemp.G *= attenuation.Y;
colorTemp.B *= attenuation.Z;
return(colorTemp);
}
else
{
return(new Color3D(0, 0, 0));
}
//Vector3 target = rec.P + rec.Normal + RandomInUnitSphere();
//Color3D colorTemp = Color(new Ray(new Point3D(rec.P.X, rec.P.Y, rec.P.Z), target - rec.P), world);
//colorTemp.R *= 0.5;
//colorTemp.G *= 0.5;
//colorTemp.B *= 0.5;
//return colorTemp;
}
else
{
Vector3 unitDirection = Vector3.UnitVector(r.Direction);
double t = 0.5 * (unitDirection.Y + 1.0);
return(new Color3D((1.0 - t) + t * 0.5, (1.0 - t) + t * 0.7, (1.0 - t) + t * 1));
}
}
private void button1_Click(object sender, EventArgs e)
{
int nx = 1080;
int ny = 1080;
int ns = 10;
bmp = new Bitmap(nx, ny);
Random rd = new Random();
List <Hitable> list = new List <Hitable>();
list.Add(new Sphere(new Point3D(0, 0, -1), 0.5, new Lambertian(new Vector3(0.8, 0.3, 0.3))));
list.Add(new Sphere(new Point3D(0, -100.5, -1), 100, new Lambertian(new Vector3(0.8, 0.8, 0.0))));
list.Add(new Sphere(new Point3D(1, 0, -1), 0.5, new Metal(new Vector3(0.8, 0.6, 0.2), 0.3)));
list.Add(new Sphere(new Point3D(-1, 0, -1), 0.5, new Dielectrics(1.5)));
HitableList world = new HitableList(list, 4);
Camera cam = new Camera(new Point3D(-2, 2, 1), new Point3D(0, 0, -1), new Vector3(0, 1, 0), 90, (double)(nx) / (double)(ny));
for (int i = 0; i < nx; i++)
{
for (int j = 0; j < ny; j++)
{
Color3D col = new Color3D();
for (int s = 0; s < ns; s++)
{
double u = (double)(i + rd.NextDouble()) / (double)nx;
double v = (double)(j + rd.NextDouble()) / (double)ny;
Ray r = cam.GetRay(u, v);
Color3D colTemp = RTUtils.Color(r, world, 0);
col.R += colTemp.R;
col.G += colTemp.G;
col.B += colTemp.B;
}
col.R /= ns;
col.G /= ns;
col.B /= ns;
col = new Color3D(Math.Sqrt(col.R), Math.Sqrt(col.G), Math.Sqrt(col.B));
int ir = (int)(255.99 * col.R);
int ig = (int)(255.99 * col.G);
int ib = (int)(255.99 * col.B);
bmp.SetPixel(i, ny - j - 1, Color.FromArgb(ir, ig, ib));
}
}
pictureBox1.BackgroundImage = bmp;
}
