public void IntersectInsideSphereTest()
{
var ray = Helper.Ray(Helper.CreatePoint(0, 0, 0), Helper.CreateVector(0, 0, 1));
var sphere = Helper.Sphere();
var xs = new Intersections();
sphere.Intersect(ref ray.Origin, ref ray.Direction, xs);
Check.That(xs.Select(i => i.T)).ContainsExactly(-1, 1);
Check.That(xs.Select(i => i.Object)).ContainsExactly(sphere, sphere);
}
public void IntersectSphereBehindRayTest()
{
var ray = Helper.Ray(Helper.CreatePoint(0, 0, 5), Helper.CreateVector(0, 0, 1));
var sphere = Helper.Sphere();
var xs = new Intersections();
sphere.Intersect(ref ray.Origin, ref ray.Direction, xs);
Check.That(xs.Select(i => i.T)).ContainsExactly(-6, -4);
}
public void WorldIntersectsTest()
{
var world = GetDefaultWorld();
var ray = Helper.Ray(Helper.CreatePoint(0, 0, -5), Helper.CreateVector(0, 0, 1));
var intersections = new Intersections();
world.Intersect(ray, intersections);
Check.That(intersections.Select(intersection => intersection.T)).ContainsExactly(4, 4.5, 5.5, 6);
}
public void IntersectScaledTest()
{
var ray = Helper.Ray(Helper.CreatePoint(0, 0, -5), Helper.CreateVector(0, 0, 1));
var sphere = Helper.Sphere();
sphere.Transform = Helper.Scaling(2, 2, 2);
var xs = new Intersections();
sphere.Intersect(ref ray.Origin, ref ray.Direction, xs);
Check.That(xs.Select(i => i.T)).ContainsExactly(3, 7);
}