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);
}
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 Hit(Ray ray, double tMin, double tMax, out ShadeRec shadeRec)
{
if (obj.Hit(ray, tMin, tMax, out shadeRec))
{
shadeRec.Normal = -1 * shadeRec.Normal;
return(true);
}
else
{
return(false);
}
}
public override bool Hit(Ray ray, double tMin, double tMax, out ShadeRec shadeRec)
{
Ray movedRay = new Ray(ray.Origin - offset, ray.Direction);
if (ptr.Hit(movedRay, tMin, tMax, out shadeRec))
{
shadeRec.HitPoint = shadeRec.HitPoint + offset;
return(true);
}
else
{
return(false);
}
}
public override bool Hit(Ray ray, double tMin, double tMax, out ShadeRec shadeRec)
{
shadeRec = new ShadeRec(); shadeRec.IsHit = false;
double closestT = tMax;
foreach (GeometryObject geometry in list)
{
ShadeRec tmp;
if (geometry.Hit(ray, tMin, closestT, out tmp))
{
shadeRec = tmp;
closestT = tmp.HitT;
}
}
return(shadeRec.IsHit);
}
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);
}
public ShadeRec HitAll(Ray ray)
{
ShadeRec srNearest = new ShadeRec(); srNearest.IsHit = false;
foreach (GeometryObject geometry in geometrys)
{
ShadeRec tmp;
geometry.Hit(ray, 1e-3, 1e15, out tmp);
if (tmp.IsHit)
{
if (!srNearest.IsHit)
{
srNearest = tmp;
}
else if (tmp.HitT < srNearest.HitT)
{
srNearest = tmp;
}
}
}
return(srNearest);
}
public override bool Hit(Ray ray, double tMin, double tMax, out ShadeRec shadeRec)
{
ShadeRec rec1, rec2; shadeRec = new ShadeRec();
if (boundary.Hit(ray, -1e15, 1e15, out rec1))
{
if (boundary.Hit(ray, rec1.HitT + 1e-4, 1e15, out rec2))
{
if (rec1.HitT < tMin)
{
rec1.HitT = tMin;
}
if (rec2.HitT > tMax)
{
rec2.HitT = tMax;
}
if (rec1.HitT >= rec2.HitT)
{
return(false);
}
if (rec1.HitT < 0)
{
rec1.HitT = 0;
}
double distanceInsideBoundary = (rec2.HitT - rec1.HitT) * ray.Direction.Magnitude();
double hitDistance = -(1.0 / density) * Math.Log(Form2.random());
if (hitDistance < distanceInsideBoundary)
{
shadeRec.IsHit = true;
shadeRec.HitT = rec1.HitT + hitDistance / ray.Direction.Magnitude();
shadeRec.HitPoint = ray.getPointAtRay(shadeRec.HitT);
shadeRec.Normal = new Vector3D(Form2.random(), Form2.random(), Form2.random());
shadeRec.HitObjGloMat = phase_function;
return(true);
}
}
}
return(false);
}
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));
}
}
public override bool Hit(Ray ray, double tMin, double tMax, out ShadeRec shadeRec)
{
shadeRec = new ShadeRec(); shadeRec.IsHit = false;
if (_box.hit(ray))
{
ShadeRec left_rec, right_rec;
bool hit_left = left.Hit(ray, tMin, tMax, out left_rec);
bool hit_right = right.Hit(ray, tMin, tMax, out right_rec);
if (hit_left && hit_right)
{
if (left_rec.HitT < right_rec.HitT)
{
shadeRec = left_rec;
}
else
{
shadeRec = right_rec;
}
return(true);
}
else if (hit_left)
{
shadeRec = left_rec;
return(true);
}
else if (hit_right)
{
shadeRec = right_rec;
return(true);
}
else
{
return(false);
}
}
return(false);
}
public override bool Hit(Ray ray, double tMin, double tMax, out ShadeRec shadeRec)
{
return(list_ptr.Hit(ray, tMin, tMax, out shadeRec));
}