Problemm with EvalSrf

In the attached image there is an example of EvalSrf.
The problem is:
because i get two different result if use like output C or D/2 that return the same value?
Ciao Vittorio

Hi Vittorio,

I think C returns a centroid (point) of a box that contains your surface, not a u,v coordinate of your surface.
D returns a diagonal vector (again a point). Try using a “Vector display” component by inputting the half value of what D returns for “V” plug, and use the closest vertex of your surface (the closest to 0,0,0) as an anchor point. Top of the vector will be at the exact place as the returned point from C.