public void CanGetRayDirection()
{
// Arrange
var pos = new Vector(0, 0, 0);
var dir = new Vector(0, 0, 1);
var screen = new Screen(400, 300);
var camera = new Camera(pos, dir, screen);
// Act
var ray = camera.GetRayDirection(100, 100);
// Assert
Assert.Less(Math.Abs((-1.0 / 8.0) - ray.X), 0.005);
Assert.Less(Math.Abs((1.0 / 12.0) - ray.Y), 0.005);
Assert.Less(Math.Abs((1.0) - ray.Z), 0.02);
}
public void CanConstructNewCamera()
{
// Arrange
var pos = new Vector(0, 0, 0);
var dir = new Vector(0, 0, 1);
var screen = new Screen(100, 100);
// Act
var camera = new Camera(pos, dir, screen);
// Assert
Assert.AreEqual(pos, camera.Position);
// Forward is a unit vector pointing in 'lookAt' from 'position'
Assert.IsTrue(camera.Forward.Equals(new Vector(0, 0, 1)));
// Right
Assert.IsTrue(camera.Right.Equals(new Vector(1,0,0)));
// Up
Assert.IsTrue(camera.Up.Equals(new Vector(0,1,0)));
}