Rotated triangular tesselation

Hi everyone,

I am having some trouble with a  tessellation and I have several questions, regarding it and it's structure. Some help would be much appreciated!

I am trying to create a surface that can be rough or smooth and can move through curves. I have attached an image of what I want it to look like. The problem is that with the script I have developed I get an extra surface for everyone of those slightly rotated and deformed triangles. See the other attachment. I have included a script of this surface. It needs an attractor point. 

My other questions relate to developing a logical structure for this, and I have tried many ways. I am trying at the moment to create a rib system from a lofted digrid but I cannot get each of the rib segments to join. I will post another question about this separately. 

Thanks!

Ben.