public void ComputingNormalOnTransformedShape()
{
var s = new shapes.TestShape(tf.Scaling(1, 0.5, 1) * tf.RotationZ(Math.PI / 5));
var n = s.NormalAt(pt.Point(0, Math.Sqrt(2) / 2, -Math.Sqrt(2) / 2));
var exp = pt.Vector(0, 0.97014, -0.24254);
CustomAssert.Equal(exp, n, 5);
}
public void ComputingNormalOnTranslatedShape()
{
var s = new shapes.TestShape(tf.Translation(0, 1, 0));
var n = s.NormalAt(pt.Point(0, 1.70711, -0.70711));
var exp = pt.Vector(0, 0.70711, -0.70711);
CustomAssert.Equal(exp, n, 5);
}