public void ShadingOutsideIntersection()
{
var w = World.Default();
var r = new Ray(new Point(0, 0, -5), new Vector(0, 0, 1));
var shape = w.Objects[0];
var i = new Intersection(4f, shape);
var comps = new IntersectionInfo(i, r);
var c = PhongShading.HitColor(w, comps);
c.Should().Be(new Color(0.38066f, 0.47583f, 0.2855f));
}
public void ShadingInsideIntersection()
{
var w = World.Default();
w.SetLights(new PointLight(new Point(0, 0.25f, 0), new Color(1f, 1f, 1f)));
var r = new Ray(new Point(0, 0, 0), new Vector(0, 0, 1));
var shape = w.Objects[1];
var i = new Intersection(0.5f, shape);
var comps = new IntersectionInfo(i, r);
var c = PhongShading.HitColor(w, comps);
c.Should().Be(new Color(0.90482f, 0.90482f, 0.90482f));
}
public void HitColorIncludeReflectedColor()
{
var w = World.Default();
var shape = new Plane();
shape.SetMaterial(new Material {
Reflective = 0.5f
});
shape.SetTransform(Transform.Translate(0, -1, 0));
w.AddObject(shape);
var r = new Ray(new Point(0, 0, -3), new Vector(0, -MathF.Sqrt(2f) / 2f, MathF.Sqrt(2f) / 2f));
var i = new Intersection(MathF.Sqrt(2f), shape);
var comps = new IntersectionInfo(i, r);
PhongShading.HitColor(w, comps).Should().Be(new Color(0.87677f, 0.92436f, 0.82918f));
}
public void HitColorIncludesFresnelEffectOnReflectiveTransparentSurface()
{
var w = World.Default();
var floor = new Plane {
Material = { Transparency = 0.5f, Reflective = 0.5f, RefractiveIndex = 1.5f }
};
floor.SetTransform(Transform.Translate(0, -1, 0));
w.AddObject(floor);
var ball = new Sphere {
Material = { Texture = new SolidColor(new Color(1, 0, 0)), Ambient = 0.5f }
};
ball.SetTransform(Transform.Translate(0, -3.5f, -0.5f));
w.AddObject(ball);
var r = new Ray(new Point(0, 0, -3), new Vector(0, -MathF.Sqrt(2f) / 2f, MathF.Sqrt(2f) / 2f));
var i = new Intersection(MathF.Sqrt(2f), floor);
var xs = Intersections.Create(i);
var comps = new IntersectionInfo(xs[0], r, xs);
PhongShading.HitColor(w, comps, 5).Should().Be(new Color(0.93391f, 0.69643f, 0.69243f));
}