1/Use AimConstrain command in python. 2/Use MVector as maya particle  and instancer the geometry to replace the particles. download the file here- 

The Port of Barcelona are the nexus of material and data flows. As the locus of intense development and social exchanges at all levels, the Port in 2115 should reinvite a scenario to interact with the environments. By transcending the monofunctional infrastructure through a rhizomatic layer, the project acts as a Responsive Landscape to fluctuate the inherent territory between natural surroundings and stratification of infrastructure , incorporating civic possibilities on site upon which such systems cross.