public void ShadeHitIntersectionFromInside()
{
var world = new DefaultWorld(new PointLight(new Point(0, 0.25f, 0), Color.White));
var ray = new Ray(new Point(0, 0, 0), new Vector(0, 0, 1));
var shape = world.Shapes[1];
var intersection = new Intersection(0.5f, shape);
var intersectionInfo = new IntersectionInfo(new Intersections(intersection), intersection, ray);
Assert.Equal(new Color(0.9046617f, 0.9046617f, 0.9046617f), world.ShadeHit(intersectionInfo, 0));
}
public void ShadeHitIntersectionFromOutside()
{
var world = new DefaultWorld();
var ray = new Ray(new Point(0, 0, -5), new Vector(0, 0, 1));
var shape = world.Shapes[0];
var intersection = new Intersection(4, shape);
var intersectionInfo = new IntersectionInfo(new Intersections(intersection), intersection, ray);
Assert.Equal(new Color(0.38066f, 0.47583f, 0.2855f), world.ShadeHit(intersectionInfo, 0));
}
public void ShadeHitReflectiveMaterial()
{
var world = new DefaultWorld();
var plane = new Plane(
Matrix4x4.Translation(0, -1, 0),
new Material(reflective: 0.5f));
world.Shapes.Add(plane);
var ray = new Ray(new Point(0, 0, -3), new Vector(0, -MathF.Sqrt(2) / 2, MathF.Sqrt(2) / 2));
var intersection = new Intersection(MathF.Sqrt(2), plane);
var info = new IntersectionInfo(new Intersections(intersection), intersection, ray);
var actual = world.ShadeHit(info, 1);
Assert.Equal(new Color(0.87688595f, 0.9245087f, 0.82926315f), actual);
}
public void ShadeHitReflectiveAndTransparentMaterial()
{
var floor = new Plane(
Matrix4x4.Translation(0, -1, 0),
new Material(transparency: 0.5f, refractiveIndex: 1.5f, reflective: 0.5f));
var ball = new Sphere(
Matrix4x4.Translation(0, -3.5f, -0.5f),
new Material(Color.Red, ambient: 0.5f));
var world = new DefaultWorld();
world.Add(floor);
world.Add(ball);
var ray = new Ray(new Point(0, 0, -3), new Vector(0, -MathF.Sqrt(2) / 2, MathF.Sqrt(2) / 2));
var intersection = new Intersection(MathF.Sqrt(2), floor);
var info = new IntersectionInfo(new Intersections(intersection), intersection, ray);
var actual = world.ShadeHit(info, 5);
Assert.Equal(new Color(0.93391f, 0.69643f, 0.69243f), actual);
}