public static void Main(string[] args)
{
RayTracer rt = new RayTracer(800, 600, 1.0);
var bmp = new Bitmap(rt.Camera.OutputImageWidth, rt.Camera.OutputImageHeight);
HittableList world = new HittableList();
world.Add(new Sphere(new Point3(0, 0, -1), 0.5, new Lambertian(new color(0.1, 0.2, 0.5))));
world.Add(new Sphere(new Point3(0, -100.5, -1), 100, new Lambertian(new color(0.8, 0.8, 0))));
world.Add(new Sphere(new Point3(1, 0, -1), 0.5, new Metal(new color(0.8, 0.6, 0.2), 0)));
//world.Add(new Sphere(new Point3(-1, 0, -1), 0.5, new Metal(new color(0.8, 0.8, 0.8), 0.6)));
world.Add(new Sphere(new Point3(-1, 0, -1), 0.5, new Dielectric(1.5)));
for (int y = 0; y < rt.Camera.OutputImageHeight; ++y)
{
Console.WriteLine("Line: " + y.ToString() + "...");
for (int x = 0; x < rt.Camera.OutputImageWidth; ++x)
{
color pixelColor = color.Zero;
for (int s = 0; s < rt.SamplePerPixel; ++s)
{
var u = (double)(x + RayTracer.RandomDouble()) / (rt.Camera.OutputImageWidth - 1);
var v = (double)(y + RayTracer.RandomDouble()) / (rt.Camera.OutputImageHeight - 1);
Ray ray = rt.Camera.GetRay(u, v);
pixelColor += rt.ComputeRayColor(ray, world, RayTracer.MaxRecursiveDepth);
}
rt.WriteOutputColorAt(x, y, pixelColor, bmp);
}
}
Console.WriteLine("Save out final image.");
bmp.Save("/Users/jhq/Desktop/RT.bmp");
}
public bool Scatter(Ray rayIn, ref HitRecord rec, out color attenuation, out Ray scattered)
{
attenuation = new color(1.0, 1.0, 1.0);
double etai_over_etat = rec.isFrontFace ? 1.0 / ref_idx : ref_idx;
var unit_direction = rayIn.Direction.unit_vector();
var cos_theta = Math.Min(Vec3.dot(-unit_direction, rec.normal), 1.0);
var sin_theta = Math.Sqrt(1 - cos_theta * cos_theta);
if (etai_over_etat * sin_theta > 1)
{
var reflected = RayTracer.Reflect(unit_direction, rec.normal);
scattered = new Ray(rec.p, reflected);
return(true);
}
var reflect_prob = schlick(cos_theta, etai_over_etat);
if (RayTracer.RandomDouble() < reflect_prob)
{
var reflected = RayTracer.Reflect(unit_direction, rec.normal);
scattered = new Ray(rec.p, reflected);
return(true);
}
var refracted = RayTracer.Refract(unit_direction, rec.normal, etai_over_etat);
scattered = new Ray(rec.p, refracted);
return(true);
}