/// <summary>
/// Возвращает точку пересечения луча и круга параллельного плоскости z = 0
/// </summary>
/// <param name="center">Вершина</param>
/// <param name="radius">Радиус</param>
/// <param name="ray">Луч</param>
/// <returns></returns>
public static Point3D? IntersectCircle(Point3D center, double radius, Ray ray)
{
var p1 = new Point3D(center.X - radius, center.Y, center.Z);
var p2 = new Point3D(center.X, center.Y - radius, center.Z);
var plane = new ePlane(center, p1, p2);
Point3D? point1 = IntersectPlane(plane, ray);
if ((point1 != null) &&
(center.Hypot(point1.Value) <= radius))
{
return point1;
}
else
{
return null;
}
}
