public void AllRaysDirectionIsSameAsCamerasFrontDirection()
{
Camera orthographic = new OrthographicCamera(Vector3.Zero);
orthographic.Rotate(0, (float)Math.PI / 2, 0);
for (int i = 0; i < 10; i++)
{
for (int j = 0; j < 10; j++)
{
Ray ray = orthographic.GetRay((float)i / 10, (float)j / 10);
VectorsShouldBeApproximately(ray.Direction, new Vector3(1, 0, 0), Ray.Epsilon);
}
}
}
public void OrthographicCamera_GetRay_center_gives_camera_position()
{
var position = new Point(10.0f, 20.0f, -100.0f);
var up = new Vector(0.0f, 1.0f, 0.0f);
var right = new Vector(1.0f, 0.0f, 0.0f);
var width = 10u;
var height = 10u;
var camera = new OrthographicCamera(position, up, right, width, height);
var ray = camera.GetRay(5.0f, 5.0f);
Assert.AreEqual(position, ray.Start);
Assert.AreEqual(new Vector(0.0f, 0.0f, 1.0f), ray.Direction);
}
public void OrthographicCamera_GetRay_throws_given_too_large_x()
{
var position = new Point(10.0f, 20.0f, -100.0f);
var up = new Vector(0.0f, 1.0f, 0.0f);
var right = new Vector(1.0f, 0.0f, 0.0f);
var width = 10u;
var height = 10u;
var camera = new OrthographicCamera(position, up, right, width, height);
camera.GetRay(10.0f, 5.0f);
}
public void OrthographicCamera_GetRay_zeros_give_bottom_left_corner()
{
var position = new Point(10.0f, 20.0f, -100.0f);
var up = new Vector(0.0f, 1.0f, 0.0f);
var right = new Vector(1.0f, 0.0f, 0.0f);
var width = 10u;
var height = 10u;
var camera = new OrthographicCamera(position, up, right, width, height);
var ray = camera.GetRay(0.0f, 0.0f);
Assert.AreEqual(new Point(5.0f, 15.0f, -100.0f), ray.Start);
Assert.AreEqual(new Vector(0.0f, 0.0f, 1.0f), ray.Direction);
}
