public void Assigning_a_transformation()
{
var shape = new TestShape();
shape.Transform = Transformation.Translation(2, 3, 4);
Assert.AreEqual(Transformation.Translation(2, 3, 4), shape.Transform);
}
public void Computing_the_normal_on_a_translated_shape()
{
var shape = new TestShape();
shape.Transform = Transformation.Translation(0, 1, 0);
var normal = shape.NormalAt(Tuple.Point(0, 1.70711, -0.70711));
Assert.AreEqual(Tuple.Vector(0, 0.70711, -0.70711), normal);
}
public void Assigning_a_material()
{
var s = new TestShape();
var m = new Material();
s.Material = m;
Assert.AreEqual(m, s.Material);
}
public void Adding_a_shape_to_a_group()
{
var group = new Group();
var shape = new TestShape();
group.AddChild(shape);
group.Shapes.Count.Should().Be(1);
group.Shapes.Should().Contain(shape);
shape.Parent.Should().Be(group);
}
public void Computing_the_normal_on_a_transformed_shape()
{
var shape = new TestShape();
shape.Transform = Transformation.Scaling(1, 0.5, 1)
.Chain(Transformation.RotationZ(Math.PI / 5));
var normal = shape.NormalAt(Tuple.Point(0, Math.Sqrt(2) / 2, -Math.Sqrt(2) / 2));
Assert.AreEqual(Tuple.Vector(0, 0.97014, -0.24254), normal);
}
public void Intersecting_a_translated_shape_with_a_ray()
{
var ray = new Ray(
Tuple.Point(0, 0, -5),
Tuple.Vector(0, 0, 1));
var shape = new TestShape();
shape.Transform = Transformation.Translation(5, 0, 0);
shape.Intersect(ray);
Assert.AreEqual(Tuple.Point(-5, 0, -5), shape.LocalRay.Origin);
Assert.AreEqual(Tuple.Vector(0, 0, 1), shape.LocalRay.Direction);
}
public void Intersecting_a_scaled_shaped_with_a_ray()
{
var ray = new Ray(
Tuple.Point(0, 0, -5),
Tuple.Vector(0, 0, 1));
var shape = new TestShape();
shape.Transform = Transformation.Scaling(2, 2, 2);
shape.Intersect(ray);
Assert.AreEqual(Tuple.Point(0, 0, -2.5), shape.LocalRay.Origin);
Assert.AreEqual(Tuple.Vector(0, 0, 0.5), shape.LocalRay.Direction);
}
public void The_default_material()
{
var s = new TestShape();
Assert.AreEqual(new Material(), s.Material);
}
public void The_default_transformation()
{
var shape = new TestShape();
Assert.AreSame(Transformation.Identity, shape.Transform);
}
public void A_shape_has_a_parent_attribute()
{
var shape = new TestShape();
Assert.IsNull(shape.Parent);
}