changing geometry by changing grid

hey guys,

I need some help...I am trying to make my simple 2 curve geometry to behave when I change the grid between them. I am attaching the image of what I am trying to achieve...Actually I cheated in grasshopper and i changed the curves and the grid between them changed, but I am trying to do the exact opposite. I don't even know how I would change the density of the grid...I tried Kangaroo, but my novice skills just took me this far...As shown above, the geometry is supposed to change by changing the grid density and here I did it the other way around.  I have tried Daniel's nervous system definition and also the CoDe-It definition ( did I say it right ??? )...please help guys !!!