public void ComputeNormalOnTranslatedShape()
{
var s = new TestShape()
{
Transform = Transform.Translate(0, 1, 0),
};
var n = s.GetNormal(Vector4.CreatePosition(0, 1.70711, -0.70711));
var expected = Vector4.CreateDirection(0, 0.70711, -0.70711);
const double eps = 0.00001;
var comparer = Vector4.GetEqualityComparer(eps);
Assert.Equal(expected, n, comparer);
}
public void ComputeNormalOnTransformedShape()
{
var s = new TestShape()
{
Transform =
Transform.Scale(1, 0.5, 1) *
Transform.RotateZ(Math.PI / 5),
};
var n = s.GetNormal(Vector4.CreatePosition(0, Math.Sqrt(2) / 2, -Math.Sqrt(2) / 2));
var expected = Vector4.CreateDirection(0, 0.97014, -0.24254);
const double eps = 0.00001;
var comparer = Vector4.GetEqualityComparer(eps);
Assert.Equal(expected, n, comparer);
}