point attractor to surface

Hello,

I am working on a facade following an attractor point (the sun).

I want that the points on the surface follow the attractor point. The problem is that when i do that the points go in the wrong direction, in the z-direction. 

The question is, how can i let the points go in the other directions.

Maybe i have to split the loft, how can i do that?

The other thing is that the create surface from points gives an error.

Another question about attractor points, can i parametrise the weight of the attractor point, how much the points go to the attractor. And are there other properties that i can change?

greetz,

Mariette