public override bool scatter(Ray rayIn, ShadeRec sr, out SColor Attenuation, out Ray rayScatter)
{
Point3D target = (sr.HitPoint + sr.Normal) + Vector3D.RandomInUnitSphere();
rayScatter = new Ray(sr.HitPoint, target - sr.HitPoint);
Attenuation = texture.getColor(sr.U, sr.V, sr.HitPoint);
return(true);
}
//参数：Lambert，Pong，高光指数，颜色
public Material(double kd, double ks, double ka, double ns, SColor matColor)
{
_kd = kd;
_ks = ks;
_ka = ka;
_ns = ns;
_matColor = matColor;
_isTexture = false;
}
public override bool scatter(Ray rayIn, ShadeRec sr, out SColor Attenuation, out Ray rayScatter)
{
Vector3D reflectDir = Ray.getReflectDir(rayIn.Direction, sr.Normal);
reflectDir.Normalize();
rayScatter = new Ray(sr.HitPoint, reflectDir + fuzz * Vector3D.RandomInUnitSphere());
Attenuation = texture.getColor(sr.U, sr.V, sr.HitPoint);
return((rayScatter.Direction * sr.Normal) > 0);
}
public override bool scatter(Ray rayIn, ShadeRec sr, out SColor Attenuation, out Ray rayScatter)
{
Attenuation = new SColor(1, 1, 1);
Vector3D outward_normal;
Vector3D refracted;
Vector3D reflected = Ray.getReflectDir(rayIn.Direction, sr.Normal);
double eta, cos, reflect_prob;
if (rayIn.Direction * sr.Normal > 0)
{
outward_normal = -1 * sr.Normal;
eta = _RI;
cos = _RI * (rayIn.Direction * sr.Normal) / rayIn.Direction.Magnitude();
}
else
{
outward_normal = sr.Normal;
eta = 1.0 / _RI;
cos = -1.0 * (rayIn.Direction * sr.Normal) / rayIn.Direction.Magnitude();
}
if (refract(rayIn.Direction, outward_normal, eta, out refracted))
{
reflect_prob = schlick(cos, eta);
rayScatter = new Ray(sr.HitPoint, refracted);
}
else
{
reflect_prob = 1.0;
rayScatter = new Ray(sr.HitPoint, reflected);
}
if (Form2.random() < reflect_prob)
{
rayScatter = new Ray(sr.HitPoint, reflected);
}
else
{
rayScatter = new Ray(sr.HitPoint, refracted);
}
return(true);
}
SColor Render(Ray ray, int depth)
{
ShadeRec sr = world.HitAll(ray);
Ray scattered = new Ray();
if (sr.IsHit)
{
SColor emited = sr.HitObjGloMat.emit(sr.U, sr.V, sr.HitPoint);
SColor attenuation = new SColor(0, 0, 0);
if (depth < 50 && sr.HitObjGloMat.scatter(ray, sr, out attenuation, out scattered))
{
return(emited + attenuation * Render(scattered, depth + 1));
}
else
{
return(emited);
}
}
else
{
return(new SColor(0, 0, 0));
}
}
private async Task Build()
{
Vector3D from = new Vector3D(478, 278, -600), at = new Vector3D(278, 278, 0);
int width = 800, height = 400;
Camera camera = new Camera(from, at, new Vector3D(0, 1, 0), 45, 1.0 * width / height, 0.0, (from - at).Magnitude());
Bitmap bitmap = new Bitmap(width, height);
int sp = 500;
timer1.Enabled = true;
timer1.Start();
await Task.Run(() =>
{
//world.PerlinSphere();
//world.CornellBox();
//world.BoxWorld();
world.FinalFace();
for (int i = 0; i < width; ++i)
{
for (int j = 0; j < height; ++j)
{
SColor clr = new SColor(0, 0, 0);
for (int k = 0; k < sp; ++k)
{
Ray primaryRay = camera.getRay((i + random()) / width, (j + random()) / height);
clr += Render(primaryRay, 0);
}
clr *= 1.0 / sp;
clr = new SColor(Math.Sqrt(clr.R), Math.Sqrt(clr.G), Math.Sqrt(clr.B));
bitmap.SetPixel(i, j, clr.RGB255());
}
}
});
timer1.Stop();
pictureBox1.BackgroundImage = bitmap;
}
public ConstantTexture(SColor color)
{
_color = color;
}