private void HandleRefraction(Computations comps, IntersectionCollection xs)
{
var containers = new List<Shape>();
foreach (var intersection in xs.Intersections)
{
if (intersection.T == T)
comps.n1 = containers.Any()
? containers.Last().Material.RefractiveIndex
: 1.0;
if (containers.Contains(intersection.Object))
containers.Remove(intersection.Object);
else
containers.Add(intersection.Object);
if (intersection.T == T)
{
comps.n2 = containers.Any()
? containers.Last().Material.RefractiveIndex
: 1.0;
break;
}
}
}
public Computations PrepareComputations(Ray ray, IntersectionCollection xs = null)
{
var c = new Computations();
c.T = T;
c.Object = Object;
c.Point = ray.Position(T);
c.EyeVector = -ray.Direction;
c.NormalVector = Object.NormalAt(c.Point, this);
if (c.NormalVector.Dot(c.EyeVector) < 0)
{
c.Inside = true;
c.NormalVector = -c.NormalVector;
}
c.OverPoint = c.Point + c.NormalVector * C.Epsilon;
c.UnderPoint = c.Point - c.NormalVector * C.Epsilon;
c.ReflectV = ray.Direction.Reflect(c.NormalVector);
xs = xs ?? new IntersectionCollection();
HandleRefraction(c, xs);
return c;
}
