All previous experiments used handwritten fitness functions to guide the search
For EvoCAD we need instead to compute a generic fitness value for any BPDL structure.
Although optimized fitness functions will require further study, the fitness
of a structure S has been defined as:

(where *d* computes the distance between a point and the nearest brick
in the structure, and *supp* uses the simulator to compute the fraction
of a certain load that the structure supports)