static void printColor(UnityEngine.Vector3 color)
{
color = Exten.clamp01(color);
int r = (int)(color.x * 255.99f);
int g = (int)(color.y * 255.99f);
int b = (int)(color.z * 255.99f);
print("{0} {1} {2} ", r, g, b);
}
UnityEngine.Vector3 random_in_unit_disk()
{
UnityEngine.Vector3 p;
do
{
p = 2.0f * new UnityEngine.Vector3(Exten.rand01(), Exten.rand01(), 0) - new UnityEngine.Vector3(1, 1, 0);
} while (UnityEngine.Vector3.Dot(p, p) >= 1.0f);
return(p);
}
public bool Scatter(Ray ray, UnityEngine.Vector3 point, UnityEngine.Vector3 normal, out UnityEngine.Vector3 attenuation, out Ray scattered)
{
var reflected = Exten.reflect(ray.direction, normal);
if (fuzz > 0)
{
reflected = reflected + fuzz * Exten.RandomVecInSphere();
}
scattered = new Ray(point, reflected);
attenuation = color;
return(UnityEngine.Vector3.Dot(ray.direction, normal) < 0);
}
public static void Main(UnityEngine.Texture2D texture, int sampleCount = 5)
{
int width = texture.width;
int height = texture.height;
Exten.r = new Random(0);
//scene = random_scene();
UnityEngine.Vector3 lookfrom = new UnityEngine.Vector3(3, 3, 2);
UnityEngine.Vector3 lookat = new UnityEngine.Vector3(0, 0, -1);
float dist_to_focus = (lookat - lookfrom).length();
float aperture = 2.0f;
Camera camera = new Camera(lookfrom, lookat, new UnityEngine.Vector3(0, 1, 0), 60, (float)(width) / (float)(height), aperture, dist_to_focus);
//print("P3\n{0} {1}\n255\n", width, height);
for (int i = height - 1; i >= 0; --i)
{
for (int j = 0; j < width; ++j)
{
var c = new UnityEngine.Vector3(0, 0, 0);
for (int k = 0; k < sampleCount; ++k)
{
float x = (j + Exten.rand01()) / (float)width;
float y = (i + Exten.rand01()) / (float)height;
var r = camera.GenRay(x, y);
Profiler.BeginSample("RayingRay");
c += RayTracing(r, 0);
Profiler.EndSample();
}
c /= sampleCount;
var c1 = c.gamma();
UnityEngine.Color outColor = new UnityEngine.Color(c1.x, c1.y, c1.z, 1);
texture.SetPixel(j, i, outColor);
}
}
}
static Hitable random_scene()
{
int n = 500;
Hitable[] list = new Hitable[n + 1];
list[0] = new Sphere(new UnityEngine.Vector3(0, -1000, 0), 1000, new Metal(new UnityEngine.Vector3(0.5f, 0.5f, 0.5f), 0.1f));
int i = 1;
for (int a = -11; a < 11; a++)
{
for (int b = -11; b < 11; b++)
{
float choose_mat = Exten.rand01();
var center = new UnityEngine.Vector3(a + 0.9f * Exten.rand01(), 0.2f, b + 0.9f * Exten.rand01());
if ((center - new UnityEngine.Vector3(4f, 0.2f, 0f)).length() > 0.9f)
{
if (choose_mat < 0.8)
{ // diffuse
list[i++] = new Sphere(center, 0.2f, new Lambertian(new UnityEngine.Vector3(Exten.rand01() * Exten.rand01(), Exten.rand01() * Exten.rand01(), Exten.rand01() * Exten.rand01())));
}
else if (choose_mat < 0.95f)
{ // metal
list[i++] = new Sphere(center, 0.2f,
new Metal(new UnityEngine.Vector3(0.5f * (1 + drand48()), 0.5f * (1 + drand48()), 0.5f * (1 + drand48())), 0.5f * drand48()));
}
else
{ // glass
list[i++] = new Sphere(center, 0.2f, new Dieletric(1.5f));
}
}
}
}
list[i++] = new Sphere(new UnityEngine.Vector3(2, 1, 0), 1.0f, new Dieletric(1.3f));
//list[i++] = new Sphere(new vec3(-3, 1, 2), 1.0f, new Metal(new vec3(0.4f, 0.2f, 0.1f),0.2f));
//list[i++] = new Sphere(new vec3(4, 1, 0), 1.0f, new Metal(new vec3(0.7f, 0.6f, 0.5f), 0.0f));
//list[i++] = new Sphere(new vec3(4, 1, -0.5f), 1.0f, new Metal(new vec3(0.7f, 0.6f, 0.5f), 0.0f));
return(new HitList(list.Where(p => p != null).ToArray()));
}
public bool Scatter(Ray ray, UnityEngine.Vector3 point, UnityEngine.Vector3 normal, out UnityEngine.Vector3 attenuation, out Ray scattered)
{
attenuation = new UnityEngine.Vector3(1.0f, 1.0f, 1.0f);
float eta = ref_idx;
var n = normal;
if (UnityEngine.Vector3.Dot(ray.direction, normal) > 0)//从内到外
{
n = new UnityEngine.Vector3(-normal.x, -normal.y, -normal.z);
}
else
{
eta = 1.0f / eta;
}
UnityEngine.Vector3 r;
float prob = 1.0f;
if (Exten.refract(ray.direction, n, eta, out r))
{
float cosi = -UnityEngine.Vector3.Dot(ray.direction, n);
float cost = -UnityEngine.Vector3.Dot(r, n);
prob = fresnel(cosi, cost, eta);
}
if (Exten.rand01() < prob)
{
UnityEngine.Vector3 reflected = Exten.reflect(ray.direction, normal);
scattered = new Ray(point, reflected);
}
else
{
scattered = new Ray(point, r);
}
return(true);
}
static float drand48()
{
return(Exten.rand01());
}
public bool Scatter(Ray ray, UnityEngine.Vector3 point, UnityEngine.Vector3 normal, out UnityEngine.Vector3 attenuation, out Ray scattered)
{
scattered = new Ray(point, normal + Exten.RandomVecInSphere());
attenuation = color;
return(true);
}