public void CanChangeTransform()
{
var s = new TestGeometry();
var t = Transform.Translate(2, 3, 4);
s.SetTransform(t);
s.Transform.Should().Be(t);
}
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 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));
}