public void Sphere_GetNormalAtPoint_returns_vector_in_correct_direction()
{
var centre = new Point(50.0f, -12.0f, 4.2f);
var radius = 10.0f;
var s = new Sphere(centre, radius);
var actual = s.GetNormalAtPoint(new Point(60.0f, -12.0f, 4.2f));
Assert.AreEqual(new Vector(1.0f, 0.0f, 0.0f), actual);
}
public void Sphere_GetNormalAtPoint_returns_normalised_vector()
{
var centre = new Point(50.0f, -12.0f, 4.2f);
var radius = 10.0f;
var s = new Sphere(centre, radius);
var actual = s.GetNormalAtPoint(new Point(60.0f, -12.0f, 4.2f));
Assert.AreEqual(1.0f, actual.Norm(), EPSILON);
}
