Changing density for developable 3d pattern

Hi guys, 

With the help of my professor I made a definition that divides any surface into 2d triangles with a central triangular voids. They are the result of polylines being offset. What I would like to do is make it so the density of the triangles increase/decrease, like with an attractor point. Right now I have it where the inside and outside "diameters" of the triangles are fixed by sliders. I have attached the .3dm and .ghx files. Any inside would be helpful. 

Thanks, 

Sean