Actually, the NDCCamera is the one you could ask this for (but I added it because I like the idea that there always is a camera). The PixelCamera projects `(0..w, 0..y)` to NDC, where `w` and `h` are the dimensions (resolution) of the ViewBox.

Put another way, if you use a Visual without a scene, you get the same result as when using an NDCCamera.