public override bool IntersectRay(Ray ray, out Point intersection)
{
intersection = new Point();
//Vector3d rayOrigin = new Vector3d(ray.Origin.X, 0, ray.Origin.Y);
//Vector3d rayDirection = new Vector3d(ray.Direction.X, 0, ray.Direction.Y);
//double t = Vector3d.Dot(Origin - rayOrigin, Normal)
// / Vector3d.Dot(Vector3d, Normal);
//Point intersectionPos = ray.Evaluate(t);
//return intersectionPos.HasValue ?
// new Intersection(intersectionPos.Value) : null;
double t = -ray.Origin.Y / ray.Direction.Y;
if ((t < 0))// || (ray.Direction.X < Double.Epsilon)
{
return false;
}
intersection.Y = ray.Origin.Y - ray.Origin.X * ray.Direction.Y / ray.Direction.X;
return Math.Abs(intersection.Y) <= Aperture;
}
public abstract bool IntersectRay(Ray ray, out Point intersection);
public override bool IntersectRay(Ray ray, out Point intersection)
{
intersection = new Point();
double a = ray.Direction.X * ray.Direction.X + ray.Direction.Y * ray.Direction.Y;
double b = 2 * (ray.Origin.X * ray.Direction.X + ray.Origin.Y * ray.Direction.Y);
double c = ray.Origin.X * ray.Origin.X + ray.Origin.Y * ray.Origin.Y - Radius * Radius;
double discriminant = b * b - 4 * a * c;
if (discriminant < 0)
{
return false;
}
//// float-friendly quadratic equation
//double q = -0.5 * (b + Math.Sign(b) * Math.Sqrt(discriminant));
//double t1 = q / a;
//double t2 = c / q;
// normal quadratic equation
double t1 = (-b + Math.Sqrt(discriminant)) / (2 * a);
double t2 = (-b - Math.Sqrt(discriminant)) / (2 * a);
if (t1 > t2)
{
double swap = t1;
t1 = t2;
t2 = swap;
}
if (t2 < 0) {
return false;
}
double t = t1;
if (t1 < 0)
{
t = t2;
}
intersection = ray.Evaluate(t + 10e-5f);
if (((xMin > -Radius) && (intersection.X < xMin)) ||
((xMax < Radius) && (intersection.X > xMax)))
{
if (t == t2) { return false; }
t = t2;
intersection = ray.Evaluate(t + 10e-5f);
if (((xMin > -Radius) && (intersection.X < xMin)) ||
((xMax < Radius) && (intersection.X > xMax)))
{
return false;
}
}
return true;
}
public Ray(Ray ray)
: this(ray.Origin, ray.direction)
{
}
