public void ColorAtRayMiss()
{
var world = new DefaultWorld();
var ray = new Ray(new Point(0, 0, -5), new Vector(0, 1, 0));
Assert.Equal(new Color(0, 0, 0), world.ColorAt(ray, 0));
}
public void ColorAtRayHit()
{
var world = new DefaultWorld();
var ray = new Ray(new Point(0, 0, -5), new Vector(0, 0, 1));
Assert.Equal(new Color(0.38066f, 0.47583f, 0.2855f), world.ColorAt(ray, 0));
}
public void IsShadowed()
{
var world = new DefaultWorld();
var point = new Point(0, 10, 0);
Assert.False(world.IsShadowed(point, world.Lights[0]));
}
public void IsShadowedPointBetweenLightAndObject()
{
var world = new DefaultWorld();
var point = new Point(-2, 2, -2);
Assert.False(world.IsShadowed(point, world.Lights[0]));
}
public void RefractedColor()
{
var world = new DefaultWorld();
var sphereA = world.Shapes[0];
sphereA.Material.Ambient = 1;
sphereA.Material.Pattern = new TestPattern();
var sphereB = world.Shapes[1];
sphereB.Material.Transparency = 1;
sphereB.Material.RefractiveIndex = 1.5f;
var ray = new Ray(new Point(0, 0, 0.1f), Vector.UnitY);
var intersections = new Intersections(
new Intersection(-0.9899f, sphereA),
new Intersection(-0.4899f, sphereB),
new Intersection(0.4899f, sphereB),
new Intersection(0.9899f, sphereA));
var info = new IntersectionInfo(intersections, intersections[2], ray);
var actual = world.RefractedColor(info, 5);
Assert.Equal(new Color(0, 0.9978715f, 0.047472f), actual);
}
public void IsShadowedObjectBetweenPointAndLight()
{
var world = new DefaultWorld();
var point = new Point(10, -10, 10);
Assert.True(world.IsShadowed(point, world.Lights[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 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 ColorAtIntersectionBehindRay()
{
var world = new DefaultWorld();
world.Shapes[0] = new Sphere(new Material(new Color(0.8f, 1.0f, 0.6f), diffuse: 0.7f, specular: 0.2f, ambient: 1));
var inner = world.Shapes[1] = new Sphere(Matrix4x4.Scaling(0.5f, 0.5f, 0.5f), new Material(ambient: 1));
var ray = new Ray(new Point(0, 0, 0.75f), new Vector(0, 0, -1));
Assert.Equal(((SolidPattern)inner.Material.Pattern).Color, world.ColorAt(ray, 0));
}
public void RefractedColorOpaqueSurface()
{
var world = new DefaultWorld();
var sphere = world.Shapes[0];
var ray = new Ray(new Point(0, 0, -5), Vector.UnitZ);
var intersections = new Intersections(new Intersection(4, sphere), new Intersection(6, sphere));
var info = new IntersectionInfo(intersections, intersections[0], ray);
var actual = world.RefractedColor(info, 5);
Assert.Equal(Color.Black, actual);
}
public void RenderDefaultWorld()
{
var from = new Point(0, 0, -5);
var to = new Point(0, 0, 0);
var up = new Vector(0, 1, 0);
var transform = ViewTransform.Create(from, to, up);
var camera = new Camera(11, 11, MathF.PI / 2, transform);
var world = new DefaultWorld();
var canvas = world.Render(camera);
Assert.Equal(new Color(0.38066f, 0.47583f, 0.2855f), canvas[5, 5]);
}
public void IntersectDefaultWorldWithRay()
{
var world = new DefaultWorld();
var ray = new Ray(new Point(0, 0, -5), new Vector(0, 0, 1));
var intersections = world.Intersect(ray);
Assert.Equal(4, intersections.Count);
Assert.Equal(4, intersections[0].Time);
Assert.Equal(4.5f, intersections[1].Time);
Assert.Equal(5.5f, intersections[2].Time);
Assert.Equal(6, intersections[3].Time);
}
public void ReflectedColorNonReflectiveMaterial()
{
var world = new DefaultWorld();
var ray = new Ray(Point.Zero, Vector.UnitZ);
var shape = world.Shapes[1];
shape.Material.Ambient = 1;
var intersection = new Intersection(1, shape);
var info = new IntersectionInfo(new Intersections(intersection), intersection, ray);
var actual = world.ReflectedColor(info, 0);
Assert.Equal(Color.Black, actual);
}
public void RefractedColorTotalInternalReflection()
{
var world = new DefaultWorld();
var sphere = world.Shapes[0];
sphere.Material.Transparency = 1;
sphere.Material.RefractiveIndex = 1.5f;
var ray = new Ray(new Point(0, 0, MathF.Sqrt(2) / 2), Vector.UnitY);
var intersections = new Intersections(new Intersection(-MathF.Sqrt(2) / 2, sphere), new Intersection(MathF.Sqrt(2) / 2, sphere));
var info = new IntersectionInfo(intersections, intersections[1], ray);
var actual = world.RefractedColor(info, 5);
Assert.Equal(Color.Black, actual);
}
public void RefractedColorMaxRecursiveDepth()
{
var world = new DefaultWorld();
var sphere = world.Shapes[0];
sphere.Material.Transparency = 1;
sphere.Material.RefractiveIndex = 1.5f;
var ray = new Ray(new Point(0, 0, -5), Vector.UnitZ);
var intersections = new Intersections(new Intersection(4, sphere), new Intersection(6, sphere));
var info = new IntersectionInfo(intersections, intersections[0], ray);
var actual = world.RefractedColor(info, 0);
Assert.Equal(Color.Black, actual);
}
public void DefaultWorld()
{
var world = new DefaultWorld();
Assert.Equal(new Point(-10, 10, -10), world.Lights[0].Position);
Assert.Equal(Color.White, world.Lights[0].Intensity);
var sphere = world.Shapes[0];
Assert.Equal(new Color(0.8f, 1.0f, 0.6f), ((SolidPattern)sphere.Material.Pattern).Color);
Assert.Equal(0.7f, sphere.Material.Diffuse);
Assert.Equal(0.2f, sphere.Material.Specular);
sphere = world.Shapes[1];
Assert.Equal(Matrix4x4.Scaling(0.5f, 0.5f, 0.5f), sphere.Transform);
}
public void ReflectedColorMaxRecursiveDepth()
{
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.ReflectedColor(info, 0);
Assert.Equal(Color.Black, actual);
}
public void ReflectedColorReflectiveMaterial()
{
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.ReflectedColor(info, 1);
Assert.Equal(new Color(0.19049118f, 0.23811397f, 0.1428684f), actual);
}
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);
}