Galapagos - Multi fitness

Hi everybody !

Sorry for my english, it's not my native language.

First above all, i want to precise that before posting this, I've read - almost - all the posts concerning multi-fitness solutions with Galapagos and that I'm already accustomed with mass addition of the fitness. But this can't solve my current problem. I'll tried to explain the best I can.

Goal :

I have a tower façade to cover with modules. Each floor is divide with a radiant structural grid. Let say for the exemple that each floor is divide in 9 parts.

I want to put modules on each parts in order to cover the whole length.

The thing is that each floor is different (so finding the solution for one floor is not usefull). So we decide to use three kinds of module :

Module A is 793mm long.
Module B is 893mm long
Special module as a size between 0.714 and 0.872.

Each part of the façade must be completed with 0 to 10 Module A, 0 to 10 Module B and 2 Special Modules. Special module size can change for each part.

Solution for one part

I've realized a Galapagos solution which change these tree parameters (number of Module A, number of Module B and size of Special module) in order to minimize the difference between the total length of the modules and the length of the façade's part.

This is working very well.

Solution in Grasshopper :

Before runing Galapagos :

After runing Galapagos :

The problem

I've now to generalize the idea for the total number of parts. In my exemple now, I'll show 9 parts but the real number is several hundreds.

I changed the Number Sliders in Gene Pools. As for instance, the first Gene Pool contains 9 integers for the 9 numbers of Module A (one number for each part).

I used Mass Addition for the fitness.

And then you can guess the problem : basicaly, the solution is working. But it's very slow. I need so many time fort 9 parts that I can't imagine the time for the whole tower.

Why this ? Simply because Galapagos doesn't understand that the number of Modules A for the Part X has no influence on the Part Y. So it tries, for each part, to change every paramater (3x9 in my exemple) unless to change only the three paramaters wich affect each part.

Thus, with a large number (600-700) of parts, it's impossible to reach the beginning of a solution.

Is there someone here to help me ? Please ? :)

Thanks in anticipate,

Marc

Architect and structural engineer

http://parametriclab.eklablog.com/