public Computation(Intersection i, Ray r)
{
T = i.T;
Object = i.Object;
Material = Object.Material;
Shape parent = Object.Parent;
while (parent != null)
{
Material = parent.Material;
parent = parent.Parent;
}
Point = r.Position(T);
Eyev = -r.Direction;
Normalv = Object.NormalAt(Point, i);
if (Eyev.Dot(Normalv) < 0)
{
Inside = true;
Normalv = -Normalv;
}
else
{
Inside = false;
}
OverPoint = Point + Normalv * Constants.overPointEps;
UnderPoint = Point - Normalv * Constants.floatEps;
Reflectv = r.Direction.Reflect(Normalv);
}
public override Color Sample(int x, int y, World world)
{
Color color = Color.Black;
Ray ray = this.RayForPixel(x, y);
Point focalPoint = ray.Position(this.focalLength);
for (int i = 0; i < this.numSamples; i++)
{
Vector apertureOffset = RandomInUnitDisk() * this.aperture;
Point newOrigin = ray.Origin + apertureOffset;
Vector direction = (focalPoint - newOrigin).Normalize();
Ray secondaryRay = new Ray(newOrigin, direction, RayType.Primary);
Interlocked.Increment(ref Stats.PrimaryRays);
color += world.ColorAt(secondaryRay);
}
return(color / (double)numSamples);
}
public Computation PrepareComputations(Ray ray, List <Intersection> xs = null)
{
if (xs == null)
{
xs = new List <Intersection> {
this
};
}
var comp = new Computation
{
T = this.T,
Object = this.Object
};
comp.Point = ray.Position(comp.T);
comp.EyeV = (-ray.Direction).ToVector();
comp.NormalV = comp.Object.NormalAt(comp.Point);
if (comp.NormalV.Dot(comp.EyeV) < 0)
{
comp.Inside = true;
comp.NormalV = comp.NormalV.Negate().ToVector();
}
else
{
comp.Inside = false;
}
comp.ReflectV = ray.Direction.Reflect(comp.NormalV);
comp.OverPoint = (comp.Point + comp.NormalV * (DoubleUtils.Epsilon)).ToPoint();
comp.UnderPoint = (comp.Point - comp.NormalV * (DoubleUtils.Epsilon)).ToPoint();
var containers = new List <ISceneObject>();
foreach (var intersection in xs)
{
if (intersection.Equals(this))
{
if (!containers.Any())
{
comp.N1 = 1.0;
}
else
{
var last = containers.Last();
comp.N1 = last.Material.RefractiveIndex;
}
}
if (containers.Contains(intersection.Object))
{
containers.Remove(intersection.Object);
}
else
{
containers.Add(intersection.Object);
}
if (intersection == this)
{
if (!containers.Any())
{
comp.N2 = 1.0;
}
else
{
var last = containers.Last();
comp.N2 = last.Material.RefractiveIndex;
}
break;
}
}
return(comp);
}
protected override bool CheckCap(Ray r, float t)
{
Tuple pos = r.Position(t);
return((pos.X * pos.X - pos.Y * pos.Y + pos.Z * pos.Z) < Constants.floatEps);
}
public Comps PrepareComputations(Ray ray, List <Intersection> xs)
{
Comps comps;
comps.n1 = 0.0;
comps.n2 = 0.0;
comps.Time = this.Time;
comps.Object = this.Object;
comps.Point = ray.Position(comps.Time);
comps.Eye = -ray.Direction;
if (!xs.Any())
{
comps.Normal = comps.Object.NormalAt(comps.Point);
}
else
{
comps.Normal = comps.Object.NormalAt(comps.Point, xs[0]);
}
if (comps.Normal.Dot(comps.Eye) < 0)
{
comps.Inside = true;
comps.Normal = -comps.Normal;
}
else
{
comps.Inside = false;
}
comps.Reflect = ray.Direction.Reflect(comps.Normal);
var containers = new List <Shape>();
foreach (var i in xs)
{
if (i == this)
{
if (containers.Count == 0)
{
comps.n1 = 1.0;
}
else
{
comps.n1 = containers.Last().Material.RefractiveIndex;
}
}
if (containers.Contains(i.Object))
{
containers.Remove(i.Object);
}
else
{
containers.Add(i.Object);
}
if (i == this)
{
if (containers.Count == 0)
{
comps.n2 = 1.0;
}
else
{
comps.n2 = containers.Last().Material.RefractiveIndex;
}
break;
}
}
comps.OverPoint = comps.Point + comps.Normal * EPSILON;
comps.UnderPoint = comps.Point - comps.Normal * EPSILON;
return(comps);
}
protected virtual bool CheckCap(Ray r, float t)
{
Tuple pos = r.Position(t);
return((pos.X * pos.X + pos.Z * pos.Z) < (1 + Constants.floatEps));
}