private void IntersectCaps(Ray r, Intersections xs)
{
if (!this.Closed || Math.Abs(r.Direction.y) < EPSILON)
{
return;
}
foreach (var v in new double[] { Minimum, Maximum })
{
var t = (v - r.Origin.y) / r.Direction.y;
if (CheckCap(r, t, Math.Abs(v)))
{
xs.Add(new Intersection(t, this));
}
}
}
public Computation PrepareComputations(Ray ray, Intersections xs)
{
var comps = new Computation();
comps.T = T;
comps.Shape = Shape;
comps.Point = ray.Position(T);
comps.EyeV = -ray.Direction;
comps.NormalV = Shape.NormalAt(comps.Point, this);
comps.ReflectV = ray.Direction.ReflectOn(comps.NormalV);
if (Tuple.Dot(comps.NormalV, comps.EyeV) < 0)
{
comps.Inside = true;
comps.NormalV = -comps.NormalV;
}
comps.OverPoint = (comps.Point + comps.NormalV * EPSILON).ToPoint();
comps.UnderPoint = (comps.Point - comps.NormalV * EPSILON).ToPoint();
List <Shape> 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.Shape))
{
containers.Remove(i.Shape);
}
else
{
containers.Add(i.Shape);
}
if (i == this)
{
if (containers.Count == 0)
{
comps.N2 = 1.0;
}
else
{
comps.N2 = containers.Last().Material.RefractiveIndex;
}
break;
}
}
return(comps);
}