because there is the argument that you have to have a 3d camera to track in true 3D which is not true.  that still does not mean the 2d camera could not track something in 3D space though, because it can.

It can use an object to track that object's position in a 3d space which is what the EYETOY does indeed do.

you can say it all you want that does not mean your right!

The Eye does all the depth tracking based on its view of the controller.

"The camera does 3D tracking. The Wii has a camera looking at the dots. But the reason it can't do 3D is because, as [people] turn away, [the hardware] loses sight of the dots -- and the dots move around in unpredictable ways.

"Because our camera is looking at the controller, going back to the blind analogy, it's like those are our eyes that are watching the room for us. That's how we can tell position."

He switches the swords to models of a PS Move motion controller. The device is perfectly rendered to the controller we're holding in our hands, right down to the buttons as I move the controller around to face the PS Eye.

"This is the shape of the controller, overlayed on the video. You can actually see how precise this device is. If there was any error, you wouldn't see the controller where it's supposed to be. It's exactly where we are."

This is tracking your head and your hands. Natal is tracking your full body, so its doing the legs too. When we did Eye Toy, we found that actually these are the most important parts because they define your body. Most of the time people aren't doing kicks. It's more important to know precisely where your hand is rather than roughly know where your body is.

"I have these fine finger controls. I can squeeze the trigger. With Natal what you get is more like position. You don't actually get angles of your arms very well. We think that's more important. We're tracking less, but I think we're tracking in a more comprehensive way."

example:

The PlayStation Eye is an integral part of Sony's motion controller, the PlayStation Move. Using the illuminated sphere on top of the Move controller, the camera can track the player's movement in 3 dimensions by sensing the sphere's image size and speed. Depending on the game, the camera can also place the player's image into the gameworld, and map objects onto the Move so that the player appears to holding weapons, tools, or other objects.

because there is the argument that you have to have a 3d camera to track in true 3D which is not true.  that still does not mean the 2d camera could not track something in 3D space though, because it can.

It can use an object to track that object's position in a 3d space which is what the EYETOY does indeed do.

Ugh, fail, it's because there is an argument that a 2D camera can track in 3D...whit is physically impossible. It can only replicated, which is not TRUE 3D.

...like I stated it may not be able to track by sight @multiple angle's because there is no second camera, that still does not stop a 2D camera tracking an object in 3D space which the EYETOY DOES INDEED DO. THERE IS NO REPLICATION ABOUT IT.

IT IS TRACKING IN 3D.

No no no no!!!! The camera is NOT tracking in 3D. it is using software to gage where the object is based on size differances. That is artificial 3D, not true 3D. It has no Z Plane, only an X and a Y. 

for instance:

it does track your hand's motion because the controller is the reference point in a 3D space.

because it know's where the Move controller is, it know by reference where your hand is.

so if your hand move's forward or back or in any direction the camera track's the position of the remote and can trach your hand's movement.

like i stated it's not 3d tracking by sight but by the reference point of the controller in 3d space.

yes the eyetoy can see multiple people in 2D but in order to track in a 3D space it need's an object that would be it's reference point/ A lighted sphere work's best because the focus point of the lighted sphere. even the Wii motion tracking track's in a 3D space.

That's a software perception of a Z-plane and not a true Z plane. The camera is only capable of 2D tracking, it cannot physically see in 3D.