image sampler error question

I'm trying to sample a singular image on multiple surfaces (in this case, four).
The center of each circle and their normal are determined by dividesrf and surface frame.

When applying this method to multiple surfaces, each process seems to be applied independently per surface.

I thought this problem was due to the arrangement of the variables. As I looked them over, the resulting pattern does not continue in the Z-axis direction. The pattern basically restarts between the top and bottom surfaces.

I'm not sure how to fix this.

Should I have to arrange the surfaces so that they are continuous - just like the image sample -? Or does the image sampling command simply works this way, conducting independent calculations per surface?

Please help!