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 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));
}