public void CalculatesPickRay()
{
const int x = 100;
const int y = 200;
var cameraMock = new Mock <ICamera>();
cameraMock.Setup(c => c.CurrentFrameViewMatrix).Returns(MathTestHelpers.BuildMatrix(new float[, ]
{
{ 1, 2, 3, 0 },
{ 1, 2, 3, 0 },
{ 1, 2, 3, 0 },
{ 1, 2, 3, 1 }
}));
cameraMock.Setup(c => c.Position).Returns(new Vector3(10, 20, 30));
ICamera camera = cameraMock.Object;
var viewSize = new Size(1000, 600);
Matrix4 projectionMatrix = MathTestHelpers.BuildMatrix(new float[, ]
{
{ 4, 3, 2, 0 },
{ 4, 3, 2, 0 },
{ 4, 3, 2, 0 },
{ 4, 3, 2, 1 }
});
PickRay ray = PickRay.Pick(x, y, camera, viewSize, projectionMatrix);
var expectedDirection = new Vector3(-0.26726f, -0.53452f, -0.80178f);
Assert.Equal(camera.Position, ray.Position);
CompareResult result = MathTestHelpers.VectorCompare(expectedDirection, ray.Direction, 1e-05f);
Assert.True(result.AreEqual, result.DifferenceString);
}
