Here is a really simple definition, to create a skyscraper shape with grasshopper using metaball. 
The GH file, starts with a 100 x 50 mts plt, and a number of points in it (as an array), and the objective is to find the better fitness between the number of point implicated in each floor (decreasing number of points for each floor), the metablla parameters, and desired density in the plot, is used the octopus to get the best solution for the desired density with the phenotipe conformed with the parametters mentioned.
Octopus solver: 
Best solution: 
Render?¡?¡?¡ 
In the next few days I will re-writte the post (may be is a little bit confusing, I´m really tired), and show a facade solution that I have been working on……..
Download: GHFILE
parametricsforarchitecture 