evaluate surface

Hi,

I was wondering if anyone could point out a problem I am having.

I am creating a series of vectors coming out of the center point of UV regions. The code is working fine in general, however on a specific surface it seems to be having trouble. The vectors all seem to be poiting towards the center point (not away from it) and the amplitude cannot be adjusted (the vectors merely appear as end conditions (e.g. triangles).

Any help would be muchly appreciated!

I have attached two images (the first correct and the second incorrect) as well as the code.

Thanks!

David