distance functions?

    Jul 20 2013 | 4:58 pm
    Hi all,
    I have found this great tutorial in gen patch a day5 https://cycling74.com/tutorials/gen-patch-a-day/. The problem is that I can not clearly understand what actually happens.
    OK, if I have a 2 dim 3 plane matrix, length will give me sqrt(r^2+b^2+g^2) for every pixel.
    So I am new to isosurf and I can not imagine why [matrix 1 float32 32 32 32] -> [length] gives sphere???
    Can anyone light me up to this?