Surface control point U V W coordinates question

Intuitively, if looking at a surface as a plane.
I assumed:
u == x (horizontal)
v == y (vertical)
w == z (normal)

However when using:


That seems counter intuitive. Why does the index increase along V direction???

Hello - U and V and X and Y are not in any way related in 3d - just by chance, so to speak, sometimes. But, I don’t understand the question - indices are counted in U rows is that what you mean? - I suppose it is just a convention… dunno really.


Yes, I know.

I don’t know how to explain it. I assume the matrix of points:
[[u0,v0,w0], [u0,v1,w1],…

so if the list of control points indices is inx = [0,1,2,3,4,5,6,7,8,9]

I expect inx[2] to have u = 2, v=0 instead it has v=2 and u = 0.

Hell, when I tried to explained what I mean to you I figured out why is it the way it is. :smiley: