This is a highres model of a Photon Cannon based on the one in Starcraft II. It is built in 3d Studio Max and Zbrush and rendered in Keyshot. No floaters are used in this model. There will be a tutorial on this asset in the upcoming Vertex 3 book.
Gumroad:
https://gumroad.com/simonfuchs
Facebook:
https://www.facebook.com/hardsurface3d/