public void ShadeHitWithReflectiveTransparency()
{
World w = World.DefaultWorld();
Shape floor = new Plane();
floor.Transform = new Translate(0, -1, 0).GetTransform();
floor.Material.Reflectivity = 0.5;
floor.Material.Transparency = 0.5;
floor.Material.RefractiveIndex = 1.5;
w.AddShape(floor);
Shape ball = new Sphere();
ball.Material.Color = new Color(1, 0, 0);
ball.Material.Ambient = 0.5;
ball.Transform = new Translate(0, -3.5, -0.5).GetTransform();
w.AddShape(ball);
Ray r = new Ray(Tuple.Point(0, 0, -3), Tuple.Vector(0, -Math.Sqrt(2) / 2, Math.Sqrt(2) / 2));
List <Intersection> xs = new List <Intersection>();
xs.Add(new Intersection(Math.Sqrt(2), floor));
Computations comps = Computations.PrepareComputations(xs[0], r, xs);
Color c = w.ShadeHit(comps, 5);
Assert.AreEqual(c, new Color(0.93391, 0.69643, 0.69243));
}
public void PrecomputeReflectionVector()
{
Plane shape = new Plane();
Ray r = new Ray(Tuple.Point(0, 1, -1), Tuple.Vector(0, -Math.Sqrt(2) / 2, Math.Sqrt(2) / 2));
Intersection i = new Intersection(Math.Sqrt(2), shape);
Computations comps = Computations.PrepareComputations(i, r);
Assert.AreEqual(comps.reflectv, Tuple.Vector(0, Math.Sqrt(2) / 2, Math.Sqrt(2) / 2));
}
public void PrepareComputationsOutside()
{
Ray r = new Ray(Tuple.Point(0, 0, -5), Tuple.Vector(0, 0, 1));
Sphere shape = new Sphere();
Intersection i = new Intersection(4, shape);
Computations comps = Computations.PrepareComputations(i, r);
Assert.IsFalse(comps.inside);
}
public void SmoothTrianglePrepComps()
{
Intersection i = new Intersection(1, tri, 0.45, 0.25);
Ray r = new Ray(Tuple.Point(-0.2, 0.3, -2), Tuple.Vector(0, 0, 1));
List <Intersection> xs = new List <Intersection>();
xs.Add(i);
Computations comps = Computations.PrepareComputations(i, r, xs);
Assert.AreEqual(comps.normalv, Tuple.Vector(-0.5547, 0.83205, 0));
}
public void ShadeIntersectionOutside()
{
World w = World.DefaultWorld();
Ray r = new Ray(Tuple.Point(0, 0, -5), Tuple.Vector(0, 0, 1));
Shape shape = w.Shapes[0];
Intersection i = new Intersection(4, shape);
Computations comps = Computations.PrepareComputations(i, r);
Color c = w.ShadeHit(comps, 0);
Assert.AreEqual(c, new Color(0.38066, 0.47583, 0.2855));
}
public void SchlickWithN2GreaterN1()
{
Shape shape = Sphere.GlassSphere();
Ray r = new Ray(Tuple.Point(0, 0.99, -2), Tuple.Vector(0, 0, 1));
List <Intersection> xs = new List <Intersection>();
xs.Add(new Intersection(1.8589, shape));
Computations comps = Computations.PrepareComputations(xs[0], r, xs);
double reflectance = Intersection.Schlick(comps);
Assert.IsTrue(Globals.EqualityOfDouble(reflectance, 0.48873));
}
public void PrepareComputationsInside()
{
Ray r = new Ray(Tuple.Point(0, 0, 0), Tuple.Vector(0, 0, 1));
Sphere shape = new Sphere();
Intersection i = new Intersection(1, shape);
Computations comps = Computations.PrepareComputations(i, r);
Assert.AreEqual(comps.point, Tuple.Point(0, 0, 1));
Assert.AreEqual(comps.eyev, Tuple.Vector(0, 0, -1));
Assert.IsTrue(comps.inside);
Assert.AreEqual(comps.normalv, Tuple.Vector(0, 0, -1));
}
public void HitOffsetsPoint()
{
Ray r = new Ray(Tuple.Point(0, 0, -5), Tuple.Vector(0, 0, 1));
Sphere shape = new Sphere();
shape.Transform = new Translate(0, 0, 1).GetTransform();
Intersection i = new Intersection(5, shape);
Computations comps = Computations.PrepareComputations(i, r);
Assert.IsTrue(comps.overPoint.Z < -Globals.EPSILON / 2);
Assert.IsTrue(comps.point.Z > comps.overPoint.Z);
}
public void PrepareComputations()
{
Ray r = new Ray(Tuple.Point(0, 0, -5), Tuple.Vector(0, 0, 1));
Sphere shape = new Sphere();
Intersection i = new Intersection(4, shape);
Computations comps = Computations.PrepareComputations(i, r);
Assert.AreEqual(comps.t, i.T);
Assert.AreEqual(comps.shape, i.S);
Assert.AreEqual(comps.point, Tuple.Point(0, 0, -1));
Assert.AreEqual(comps.eyev, Tuple.Vector(0, 0, -1));
Assert.AreEqual(comps.normalv, Tuple.Vector(0, 0, -1));
}
public void SchlickWithPerpendicularRay()
{
Shape shape = Sphere.GlassSphere();
Ray r = new Ray(Tuple.Point(0, 0, 0), Tuple.Vector(0, 1, 0));
List <Intersection> xs = new List <Intersection>();
xs.Add(new Intersection(-1, shape));
xs.Add(new Intersection(1, shape));
Computations comps = Computations.PrepareComputations(xs[1], r, xs);
double reflectance = Intersection.Schlick(comps);
Assert.IsTrue(Globals.EqualityOfDouble(reflectance, 0.04));
}
public void SchlickUnderTotalInternalReflection()
{
Shape shape = Sphere.GlassSphere();
Ray r = new Ray(Tuple.Point(0, 0, Math.Sqrt(2) / 2), Tuple.Vector(0, 1, 0));
List <Intersection> xs = new List <Intersection>();
xs.Add(new Intersection(-Math.Sqrt(2) / 2, shape));
xs.Add(new Intersection(Math.Sqrt(2) / 2, shape));
Computations comps = Computations.PrepareComputations(xs[1], r, xs);
double reflectance = Intersection.Schlick(comps);
Assert.IsTrue(Globals.EqualityOfDouble(reflectance, 1.0));
}
public void ReflectedColorOfNonreflectiveMaterial()
{
World w = World.DefaultWorld();
Ray r = new Ray(Tuple.Point(0, 0, 0), Tuple.Vector(0, 0, 1));
Shape s2 = w.Shapes[1];
s2.Material.Ambient = 1;
Intersection i = new Intersection(1, s2);
Computations comps = Computations.PrepareComputations(i, r);
Color c = w.ReflectedColor(comps, 5);
Assert.AreEqual(c, new Color(0.0, 0.0, 0.0));
}
public void ShadeIntersectionInside()
{
World w = World.DefaultWorld();
w.Lights[0] = Light.PointLight(Tuple.Point(0, 0.25, 0), new Color(1, 1, 1));
Ray r = new Ray(Tuple.Point(0, 0, 0), Tuple.Vector(0, 0, 1));
Shape shape = w.Shapes[1];
Intersection i = new Intersection(0.5, shape);
Computations comps = Computations.PrepareComputations(i, r);
Color c = w.ShadeHit(comps, 0);
Assert.AreEqual(c, new Color(0.90498, 0.90498, 0.90498));
}
public void RefractedColorWithOpaqueSurface()
{
World w = World.DefaultWorld();
Shape shape = w.Shapes[0];
Ray r = new Ray(Tuple.Point(0, 0, -5), Tuple.Vector(0, 0, 1));
List <Intersection> xs = new List <Intersection>();
xs.Add(new Intersection(4, shape));
xs.Add(new Intersection(6, shape));
Computations comps = Computations.PrepareComputations(xs[0], r, xs);
Color c = w.RefractedColor(comps, 5);
Assert.AreEqual(c, new Color(0, 0, 0));
}
public void UnderPoint()
{
Ray r = new Ray(Tuple.Point(0, 0, -5), Tuple.Vector(0, 0, 1));
Sphere shape = Sphere.GlassSphere();
shape.Transform = new Translate(0, 0, 1).GetTransform();
Intersection i = new Intersection(5, shape);
List <Intersection> xs = new List <Intersection>();
xs.Add(i);
Computations comps = Computations.PrepareComputations(i, r, xs);
Assert.IsTrue(comps.underPoint.Z > Globals.EPSILON / 2);
Assert.IsTrue(comps.point.Z < comps.underPoint.Z);
}
public void LimitRecursion()
{
World w = World.DefaultWorld();
Shape shape = new Plane();
shape.Material.Reflectivity = 0.5;
shape.Transform = new Translate(0, -1, 0).GetTransform();
w.AddShape(shape);
Ray r = new Ray(Tuple.Point(0, 0, -3), Tuple.Vector(0, -Math.Sqrt(2) / 2, Math.Sqrt(2) / 2));
Intersection i = new Intersection(Math.Sqrt(2), shape);
Computations comps = Computations.PrepareComputations(i, r);
Color c = w.ReflectedColor(comps, 0);
Assert.AreEqual(c, new Color(0, 0, 0));
}
public void RefractedColorUnderTotalInternalReflection()
{
World w = World.DefaultWorld();
Shape shape = w.Shapes[0];
shape.Material.Transparency = 1.0;
shape.Material.RefractiveIndex = 1.5;
Ray r = new Ray(Tuple.Point(0, 0, Math.Sqrt(2) / 2), Tuple.Vector(0, 1, 0));
List <Intersection> xs = new List <Intersection>();
xs.Add(new Intersection(-Math.Sqrt(2) / 2, shape));
xs.Add(new Intersection(Math.Sqrt(2) / 2, shape));
Computations comps = Computations.PrepareComputations(xs[1], r, xs);
Color c = w.RefractedColor(comps, 5);
Assert.AreEqual(c, new Color(0, 0, 0));
}
public void RefractedColorWithOpaqueSurfaceMaxRecursiveDepth()
{
World w = World.DefaultWorld();
Shape shape = w.Shapes[0];
shape.Material.Transparency = 1.0;
shape.Material.RefractiveIndex = 1.5;
Ray r = new Ray(Tuple.Point(0, 0, -5), Tuple.Vector(0, 0, 1));
List <Intersection> xs = new List <Intersection>();
xs.Add(new Intersection(4, shape));
xs.Add(new Intersection(6, shape));
Computations comps = Computations.PrepareComputations(xs[0], r, xs);
Color c = w.RefractedColor(comps, 0);
Assert.AreEqual(c, new Color(0, 0, 0));
}
public void FindN1AndN2AtSeveralIntersections()
{
Sphere a = Sphere.GlassSphere();
a.Transform = new Scale(2, 2, 2).GetTransform();
a.Material.RefractiveIndex = 1.5;
Sphere b = Sphere.GlassSphere();
b.Transform = new Translate(0, 0, -0.25).GetTransform();
b.Material.RefractiveIndex = 2.0;
Sphere c = Sphere.GlassSphere();
c.Transform = new Translate(0, 0, 0.25).GetTransform();
c.Material.RefractiveIndex = 2.5;
Ray r = new Ray(Tuple.Point(0, 0, -4), Tuple.Vector(0, 0, 1));
List <Intersection> xs = new List <Intersection>()
{
new Intersection(2, a),
new Intersection(2.75, b),
new Intersection(3.25, c),
new Intersection(4.75, b),
new Intersection(5.25, c),
new Intersection(6, a)
};
double[,] targets = new double[6, 2] {
{ 1.0, 1.5 },
{ 1.5, 2.0 },
{ 2.0, 2.5 },
{ 2.5, 2.5 },
{ 2.5, 1.5 },
{ 1.5, 1.0 }
};
for (int i = 0; i < 6; i++)
{
Computations comps = Computations.PrepareComputations(xs[i], r, xs);
Assert.AreEqual(comps.n1, targets[i, 0]);
Assert.AreEqual(comps.n2, targets[i, 1]);
}
}
public void ShadeHitInShadow()
{
World w = new World();
w.Lights = new List <Light>();
w.Lights.Add(Light.PointLight(Tuple.Point(0, 0, -10), new Color(1, 1, 1)));
Sphere s1 = new Sphere();
w.AddShape(s1);
Sphere s2 = new Sphere();
s2.TransformList.Add(new Translate(0, 0, 10));
s2.InitiateTransformation();
w.AddShape(s2);
Ray r = new Ray(Tuple.Point(0, 0, 5), Tuple.Vector(0, 0, 1));
Intersection i = new Intersection(4, s2);
Computations comps = Computations.PrepareComputations(i, r);
Color c = w.ShadeHit(comps, 0);
Assert.AreEqual(c, new Color(0.1, 0.1, 0.1));
}
public void RefractedColor()
{
World w = World.DefaultWorld();
Shape a = w.Shapes[0];
a.Material.Ambient = 1.0;
a.Material.Pattern = new TestPattern();
Shape b = w.Shapes[1];
b.Material.Transparency = 1.0;
b.Material.RefractiveIndex = 1.5;
Ray r = new Ray(Tuple.Point(0, 0, 0.1), Tuple.Vector(0, 1, 0));
List <Intersection> xs = new List <Intersection>();
xs.Add(new Intersection(-0.9899, a));
xs.Add(new Intersection(-0.4899, b));
xs.Add(new Intersection(0.4899, b));
xs.Add(new Intersection(0.9899, a));
Computations comps = Computations.PrepareComputations(xs[2], r, xs);
Color c = w.RefractedColor(comps, 5);
Assert.AreEqual(c, new Color(0, 0.99888, 0.04725));
}
