private static Group CreatePyramid()
{
var pyramid = new Group("Pyramid");
var bottom = new Triangle(new Point(-0.5, 0, 0), new Point(0, 0, -1), new Point(0.5, 0, 0));
var backSide = new Triangle(new Point(-0.5, 0, 0), new Point(0, 1, -0.5), new Point(0.5, 0, 0));
var leftSide = new Triangle(new Point(-0.5, 0, 0), new Point(0, 1, -0.5), new Point(0, 0, -1));
var rightSide = new Triangle(new Point(0, 0, -1), new Point(0, 1, -0.5), new Point(0.5, 0, 0));
pyramid.AddChildren(bottom, backSide, leftSide, rightSide);
return(pyramid);
}
public void Intersecting_a_ray_with_a_nonempty_group()
{
var group = new Group();
var s1 = new Sphere();
var s2 = new Sphere(transform: Matrix4x4.CreateTranslation(0, 0, -3));
var s3 = new Sphere(transform: Matrix4x4.CreateTranslation(5, 0, 0));
group.AddChildren(s1, s2, s3);
var ray = new Ray(new Point(0, 0, -5), Vector.UnitZ);
var intersections = group.LocalIntersect(ray);
intersections.Shapes.Should().HaveCount(4).And.ContainInOrder(s2, s2, s1, s1);
}
public void SubDivideGroup()
{
var s1 = new Sphere(Translation(-2, -2, 0));
var s2 = new Sphere(Translation(-2, 2, 0));
var s3 = new Sphere(Scale(4));
var g = new Group();
g.AddChildren(s1, s2, s3);
g.Divide();
Assert.AreEqual(g.Count, 2);
Assert.IsFalse(g.Contains(s1));
Assert.IsFalse(g.Contains(s2));
Assert.IsTrue(g.Contains(s3));
}
public void GroupHasBoxContainingChildren()
{
var s = new Sphere(Translation(2, 5, -3) * Scale(2));
var c = new Cylinder(Translation(-4, -1, 4) * Scale(.5f, 1, .5f))
{
Minimum = -2, Maximum = 2
};
var g = new Group();
g.AddChildren(s, c);
var b = g.BoundingBox;
Assert.AreEqual(b.Min, Point(-4.5f, -3, -5));
Assert.AreEqual(b.Max, Point(4, 7, 4.5f));
}
public void PartitioningChildren()
{
var s1 = new Sphere(Translation(-2, 0, 0));
var s2 = new Sphere(Translation(2, 0, 0));
var s3 = new Sphere();
var g = new Group();
g.AddChildren(s1, s2, s3);
var(left, right) = g.Partition();
Assert.IsTrue(g.Contains(s3));
Assert.IsTrue(left.Contains(s1));
Assert.IsTrue(right.Contains(s2));
Assert.AreEqual(g.Count, 1);
Assert.AreEqual(left.Count, 1);
Assert.AreEqual(right.Count, 1);
}
private static Group CreateUfo()
{
var group = new Group();
for (int i = 0; i < 6; i++)
{
var leg = CreateLeg(Matrix4x4.CreateRotationY(i * (Math.PI / 3)));
group.AddChild(leg);
}
var topCap = CreateCap().ChangeTransform(Matrix4x4.CreateTranslation(0, 1, 0));
var bottomCap = CreateCap().ChangeTransform(Matrix4x4.CreateTranslation(0, 1, 0).RotateX(3.1416));
group.AddChildren(topCap, bottomCap);
return(group);
}
public void IntersectingWithNonEmptyGroup()
{
var g = new Group();
var s1 = new Sphere();
var s2 = new Sphere(Translation(0, 0, -3));
var s3 = new Sphere(Translation(5, 0, 0));
g.AddChildren(s1, s2, s3);
var r = new Ray(0, 0, -5, 0, 0, 1);
var xs = g.IntersectLocal(ref r);
xs.Sort(); //do not sort in groups as world does already do that
Assert.AreEqual(xs.Count, 4);
Assert.AreEqual(xs[0].Object, s2);
Assert.AreEqual(xs[1].Object, s2);
Assert.AreEqual(xs[2].Object, s1);
Assert.AreEqual(xs[3].Object, s1);
}
static Group HexagonSide()
{
var mat = new PhongMaterial(Util.FromHex("#7bc74d"))
{
Specular = .5f, Shininess = 800
};
var edge = new Cylinder(Translation(0, 0, -1) * RotationY(-MathF.PI / 6f) * RotationZ(-MathF.PI / 2f) *
Scale(.25f, 1, .25f))
{
Minimum = 0, Maximum = 1, Material = mat
};
var s = new Sphere(Translation(0, 0, -1) * Scale(.25f))
{
Material = mat
};
var side = new Group();
side.AddChildren(edge, s);
return(side);
}
