If you are trying to understand three-dimensional functions, it makes sense to view them in 3D. I was just pointing out that in the domain of information visualization (separate from math and scientific visualization), 2D is generally preferred for perceptual reasons.
Indeed, thank you! Hugs all around. :) You made the argument that D3 doesn't do 3D because of the DOM, and I just wanted to clarify that while this is mostly true (caveat custom elements such as X3DOM), the reason is perceptual as much as technical.
