static public Bitmap ch5(int width, int height)
{
Bitmap bmp = new Bitmap(width, height);
Vector3 lower_left_corner = new Vector3(-2, -1, -1);
Vector3 horizontal = new Vector3(4, 0, 0);
Vector3 vertical = new Vector3(0, 2, 0);
Vector3 origin = new Vector3(0, 0, 0);
float u, v;
int ir, ig, ib;
Vector3 col;
Hitable[] objList = new Hitable[2];
objList[0] = new Sphere(new Vector3(0, 0, -1), 0.5f);
objList[1] = new Sphere(new Vector3(0, -100.5f, -1), 100);
HitableList hitableList = new HitableList(objList);
for (int j = 0; j < height; ++j)
{
for (int i = 0; i < width; ++i)
{
u = (float)i / (float)width;
v = (float)j / (float)height;
col = ch5_color(new Ray(origin, lower_left_corner + horizontal * u + vertical * v), hitableList);
ir = (int)(col.r() * 255.99);
ig = (int)(col.g() * 255.99);
ib = (int)(col.b() * 255.99);
bmp.SetPixel(i, height - j - 1, Color.FromArgb(ir, ig, ib));
}
}
return(bmp);
}
/*
* static private float ch5_hit_sphere(Vector3 center, float radius, Ray ray)
* {
* Vector3 oc = ray.origin() - center;
* float a = Vector3.dot(ray.direction(), ray.direction());
* float b = 2 * Vector3.dot(oc, ray.direction());
* float c = Vector3.dot(oc, oc) - radius * radius;
* float discriminant = b * b - 4 * a * c;
* if (discriminant < 0)
* return -1.0f;
* else
* return -b - (float)Math.Sqrt(discriminant) / (2 * a);
* }
*/
static private Vector3 ch5_color(Ray r, HitableList hitableList)
{
HitRecord rec = new HitRecord();
if (hitableList.hit(r, 0.0f, float.MaxValue, ref rec))
{
return(0.5f * new Vector3(rec.normal.x() + 1, rec.normal.y() + 1, rec.normal.z() + 1));
}
else
{
float t = 0.5f * (r.direction().normalized.y() + 1);
return(new Vector3(1.0f, 1.0f, 1.0f) * (1 - t) + new Vector3(0.5f, 0.7f, 1.0f) * t);
}
}
static void Main(string[] args)
{
int nx = 1200;
int ny = 800;
int ns = 10;
Console.WriteLine("P3");
Console.WriteLine("1200 800");
Console.WriteLine("255");
// List<IHitable> list = new List<IHitable>();
// list.Add(new Sphere(new Vec3(0, 0, -1), 0.5F, new Lambertian(new Vec3(0.1F, 0.2F, 0.5F))));
// list.Add(new Sphere(new Vec3(0, -100.5F, -1), 100, new Lambertian(new Vec3(0.8F, 0.8F, 0.0F))));
// list.Add(new Sphere(new Vec3(1, 0, -1), 0.5F, new Metal(new Vec3(0.8F, 0.6F, 0.2F), 0.0F)));
// list.Add(new Sphere(new Vec3(-1, 0, -1), 0.5F, new Dielectric(1.5F)));
// list.Add(new Sphere(new Vec3(-1, 0, -1), -0.45F, new Dielectric(1.5F)));
// float R = (float)Math.Cos(Math.PI/4);
// list.Add(new Sphere(new Vec3(-R, 0, -1), R, new Lambertian(new Vec3(0, 0, 1))));
// list.Add(new Sphere(new Vec3(R, 0, -1), R, new Lambertian(new Vec3(1, 0, 0))));
HitableList world = randomScene();
Vec3 lookfrom = new Vec3(13, 2, 3);
Vec3 lookat = new Vec3(0, 0, 0);
float distToFocus = 10;
float aperture = 0.1F;
Camera cam = new Camera(lookfrom, lookat, new Vec3(0, 1, 0), 20, (float)nx / (float)ny, aperture, distToFocus);
Random randObj = new Random();
for (int j = ny - 1; j >= 0; j--)
{
for (int i = 0; i < nx; i++)
{
Vec3 col = new Vec3(0, 0, 0);
for (int s = 0; s < ns; s++)
{
float u = (float)(i + randObj.NextDouble()) / (float)nx;
float v = (float)(j + randObj.NextDouble()) / (float)ny;
Ray r = cam.getRay(u, v);
col += color(r, world, 0);
}
col /= ns;
int ir = (int)(255.99 * Math.Sqrt(col[0]));
int ig = (int)(255.99 * Math.Sqrt(col[1]));
int ib = (int)(255.99 * Math.Sqrt(col[2]));
Console.WriteLine(String.Format("{0} {1} {2}", ir, ig, ib));
}
}
}
static private Vector3 ch7_color(Ray r, HitableList hitableList)
{
HitRecord rec = new HitRecord();
if (hitableList.hit(r, 0.0001f, float.MaxValue, ref rec))
{
Vector3 target = rec.p + rec.normal + Sphere.random_in_unit_sphere();
return(0.5f * ch7_color(new Ray(rec.p, target - rec.p), hitableList));
}
else
{
float t = 0.5f * (r.direction().normalized.y() + 1);
return(new Vector3(1.0f, 1.0f, 1.0f) * (1 - t) + new Vector3(0.5f, 0.7f, 1.0f) * t);
}
}
static public Bitmap ch11(int width, int height)
{
Bitmap bmp = new Bitmap(width, height);
float u, v;
int ir, ig, ib;
Vector3 col;
Hitable[] objList = new Hitable[5];
objList[0] = new Sphere(new Vector3(0, 0, -1), 0.5f, new Lambertian(new Vector3(.1f, .2f, .5f)));
objList[1] = new Sphere(new Vector3(0, -100.5f, -1), 100f, new Lambertian(new Vector3(.8f, .8f, 0)));
objList[2] = new Sphere(new Vector3(1, 0, -1), 0.5f, new Metal(new Vector3(.8f, .6f, .2f)));
objList[3] = new Sphere(new Vector3(-1, 0, -1), 0.5f, new Dielectric(1.5f));
objList[4] = new Sphere(new Vector3(-1, 0, -1), -0.45f, new Dielectric(1.5f));
HitableList hitableList = new HitableList(objList);
Vector3 lookfrom = new Vector3(3f, 3f, 2f);
Vector3 lookat = new Vector3(0f, 0f, -1f);
float dist_to_focus = (lookfrom - lookat).length();
float aperture = 2.0f;
Camera cam = new Camera(lookfrom, lookat, new Vector3(0f, 1f, 0f), 20f, (float)width / (float)height, aperture, dist_to_focus);
int sampleCount = 10;
Random rdm = new Random(Guid.NewGuid().GetHashCode());
for (int j = 0; j < height; ++j)
{
for (int i = 0; i < width; ++i)
{
col = new Vector3(0, 0, 0);
for (int c = 0; c < sampleCount; ++c)
{
u = (float)(i + rdm.NextDouble()) / width;
v = (float)(j + rdm.NextDouble()) / height;
col += ch8_color(cam.getRayDOF(u, v), hitableList, 10);
}
col /= (float)sampleCount;
ir = (int)(col.r() * 255.99);
ig = (int)(col.g() * 255.99);
ib = (int)(col.b() * 255.99);
bmp.SetPixel(i, height - j - 1, Color.FromArgb(ir, ig, ib));
}
}
return(bmp);
}
static public Bitmap ch10(int width, int height)
{
Bitmap bmp = new Bitmap(width, height);
float u, v;
int ir, ig, ib;
Vector3 col;
Hitable[] objList = new Hitable[5];
objList[0] = new Sphere(new Vector3(0, 0, -1), 0.5f, new Lambertian(new Vector3(.8f, .3f, .3f)));
objList[1] = new Sphere(new Vector3(0, -100.5f, -1), 100, new Lambertian(new Vector3(.8f, .8f, 0)));
objList[2] = new Sphere(new Vector3(1, 0, -1), 0.5f, new Metal(new Vector3(.8f, .6f, .2f)));
objList[3] = new Sphere(new Vector3(-1, 0, -1), 0.5f, new Dielectric(1.5f));
objList[4] = new Sphere(new Vector3(-1, 0, -1), -0.45f, new Dielectric(1.5f));
HitableList hitableList = new HitableList(objList);
Camera cam = new Camera(new Vector3(-2, 2, 1), new Vector3(0, 0, -1), new Vector3(0, 1, 0), 90, (float)width / (float)height);
int sampleCount = 10;
Random rdm = new Random(Guid.NewGuid().GetHashCode());
for (int j = 0; j < height; ++j)
{
for (int i = 0; i < width; ++i)
{
col = new Vector3(0, 0, 0);
for (int c = 0; c < sampleCount; ++c)
{
u = (float)(i + rdm.NextDouble()) / width;
v = (float)(j + rdm.NextDouble()) / height;
col += ch8_color(cam.getRay(u, v), hitableList, 10);
}
col /= (float)sampleCount;
ir = (int)(col.r() * 255.99);
ig = (int)(col.g() * 255.99);
ib = (int)(col.b() * 255.99);
bmp.SetPixel(i, height - j - 1, Color.FromArgb(ir, ig, ib));
}
}
return(bmp);
}
static public Bitmap ch12(int width, int height)
{
Bitmap bmp = new Bitmap(width, height);
float u, v;
int ir, ig, ib;
Vector3 col;
HitableList hitableList = random_scene();
Vector3 lookfrom = new Vector3(13f, 2f, 3f);
Vector3 lookat = new Vector3(0f, 0f, 0f);
float dist_to_focus = (lookfrom - lookat).length();
float aperture = 0f;
Camera cam = new Camera(lookfrom, lookat, new Vector3(0f, 1f, 0f), 30f, (float)width / (float)height, aperture, 0.7f * dist_to_focus);
int sampleCount = 10;
Random rdm = new Random(Guid.NewGuid().GetHashCode());
for (int j = 0; j < height; ++j)
{
for (int i = 0; i < width; ++i)
{
col = new Vector3(0, 0, 0);
for (int c = 0; c < sampleCount; ++c)
{
u = (float)(i + rdm.NextDouble()) / width;
v = (float)(j + rdm.NextDouble()) / height;
col += ch8_color(cam.getRayDOF(u, v), hitableList, 10);
}
col /= (float)sampleCount;
ir = (int)(col.r() * 255.99);
ig = (int)(col.g() * 255.99);
ib = (int)(col.b() * 255.99);
bmp.SetPixel(i, height - j - 1, Color.FromArgb(ir, ig, ib));
}
}
return(bmp);
}
static public Bitmap ch7(int width, int height)
{
Bitmap bmp = new Bitmap(width, height);
float u, v;
int ir, ig, ib;
Vector3 col;
Hitable[] objList = new Hitable[2];
objList[0] = new Sphere(new Vector3(0, 0, -1), 0.5f);
objList[1] = new Sphere(new Vector3(0, -100.5f, -1), 100);
HitableList hitableList = new HitableList(objList);
Camera cam = new Camera();
int sampleCount = 10;
Random rdm = new Random();
for (int j = 0; j < height; ++j)
{
for (int i = 0; i < width; ++i)
{
col = new Vector3(0, 0, 0);
for (int c = 0; c < sampleCount; ++c)
{
u = ((float)i + (float)rdm.NextDouble()) / (float)width;
v = ((float)j + (float)rdm.NextDouble()) / (float)height;
col += ch7_color(cam.getRay(u, v), hitableList);
}
col /= (float)sampleCount;
ir = (int)(col.r() * 255.99);
ig = (int)(col.g() * 255.99);
ib = (int)(col.b() * 255.99);
bmp.SetPixel(i, height - j - 1, Color.FromArgb(ir, ig, ib));
}
}
return(bmp);
}
static private Vector3 ch8_color(Ray r, HitableList hitableList, int depth)
{
HitRecord rec = new HitRecord();
if (hitableList.hit(r, 0.0001f, float.MaxValue, ref rec))
{
Ray scattered = null;
Vector3 attenuation = null;
if (depth > 0 && rec.mat.scatter(r, rec, ref attenuation, ref scattered))
{
return(attenuation * ch8_color(scattered, hitableList, depth - 1));
}
else
{
return(new Vector3(0, 0, 0));
}
}
else
{
float t = 0.5f * (r.direction().normalized.y() + 1);
return(new Vector3(1.0f, 1.0f, 1.0f) * (1 - t) + new Vector3(0.5f, 0.7f, 1.0f) * t);
}
}