@JamesCurtis : Yes, mostly. I also use some other dedicated tools like Realflow for fluids, Syntheyes for tracking or Substance Painter for textures.
As a professional I also work with up to date version of LightWave, so the project date gives you an idea of which version of the render engine was used.
@slv : Hey Sylvain , "La Ligne bleue" is a program on France 3 that broadcast documentary films about society. So, those lines represent some kind of social links, basically.
Images were shot using a drone, as you probably have guessed, in Beaugrenelle district. Then, sequences were tracked using Syntheyes to add the wires, after the focal distortion had been removed and re-added for the final compositing.