public void NormalsAreNormalized()
{
var s = new TestGeometry();
var n = s.NormalAt(new Point(MathF.Sqrt(3f) / 3f, MathF.Sqrt(3f) / 3f, MathF.Sqrt(3f) / 3f),
new Intersection(1f, s));
(n == n.Normalize()).Should().BeTrue();
}
public void CanChangeTransform()
{
var s = new TestGeometry();
var t = Transform.Translate(2, 3, 4);
s.SetTransform(t);
s.Transform.Should().Be(t);
}
public void AddingChildToGroupAssignsGroupAsParent()
{
var g = new Group();
var s = new TestGeometry();
g.AddChild(s);
s.Parent.Should().Be(g);
g.Children.Should().OnlyContain(c => c == s);
}
public void NormalOnTransformedShape()
{
var s = new TestGeometry();
s.SetTransform(Transform.Scale(1f, 0.5f, 1f) * Transform.RotateZ(MathF.PI / 5f));
var n = s.NormalAt(new Point(0, MathF.Sqrt(2f) / 2f, -MathF.Sqrt(2f) / 2f), new Intersection(1f, s));
n.Should().Be(new Normal(0, 0.97014f, -0.24254f));
}
public void NormalOnTranslatedShape()
{
var s = new TestGeometry();
s.SetTransform(Transform.Translate(0, 1, 0));
var n = s.NormalAt(new Point(0, 1.70711f, -0.70711f), new Intersection(1f, s));
n.Should().Be(new Normal(0, 0.70711f, -0.70711f));
}
public void IntersectTestChildrenIfRayHitsBounds()
{
var c = new TestGeometry();
var g = new Group();
g.AddChild(c);
var r = new Ray(new Point(0, 0, -5), new Vector(0, 0, 1));
var xs = g.Intersects(r);
// Child tested so SavedRay in not default.
c.SavedRay.Should().NotBe(new Ray());
}
public void IntersectDoesNotTestChildrenIfRayMissesBounds()
{
var c = new TestGeometry();
var g = new Group();
g.AddChild(c);
var r = new Ray(new Point(0, 0, -5), new Vector(0, 1, 0));
var xs = g.Intersects(r);
// Child not tested so SavedRay remains default.
c.SavedRay.Should().Be(new Ray());
}
public void IntersectTestChildrenIfRayHitsBounds()
{
var l = new TestGeometry();
var r = new TestGeometry();
var s = new ConstructiveSolid(ConstructiveOp.Difference, l, r);
var ray = new Ray(new Point(0, 0, -5), new Vector(0, 0, 1));
var xs = s.Intersects(ray);
// Child tested so SavedRay in not default.
l.SavedRay.Should().NotBe(new Ray());
r.SavedRay.Should().NotBe(new Ray());
}
public void IntersectDoesNotTestChildrenIfRayMissesBounds()
{
var l = new TestGeometry();
var r = new TestGeometry();
var s = new ConstructiveSolid(ConstructiveOp.Difference, l, r);
var ray = new Ray(new Point(0, 0, -5), new Vector(0, 1, 0));
var xs = s.Intersects(ray);
// Child not tested so SavedRay remains default.
l.SavedRay.Should().Be(new Ray());
r.SavedRay.Should().Be(new Ray());
}
public void IntersectingTranslatedShapeWithRay()
{
var r = new Ray(new Point(0, 0, -5), new Vector(0, 0, 1));
var s = new TestGeometry();
var t = Transform.Translate(5, 0, 0);
s.SetTransform(t);
// ReSharper disable once UnusedVariable
var xs = s.Intersects(r);
s.SavedRay.Origin.Should().Be(new Point(-5, 0, -5f));
s.SavedRay.Direction.Should().Be(new Vector(0, 0, 1f));
}
public void DefaultTransformIsIdentity()
{
var s = new TestGeometry();
s.Transform.Should().Be(Transform.Identity);
}
public void HasNoParentByDefault()
{
var s = new TestGeometry();
s.Parent.Should().BeNull();
}
public void IsShape()
{
var s = new TestGeometry();
s.Should().BeAssignableTo <IGeometry>();
}
