Greg designed the installation on Illustrator, then used Softimage to model the 3d mockup using real world measurements. They then sent the 3d model over to the Green Hippo software so it could be implemented into a physical space with an accurate simulation of a 10k projector. This was done mainly because they had a total of 800 suspended balls and using other projection mapping softwares would force them to place the corresponding light over its corresponding ball manually, which they didn't have the time for (they only had 1 day to map the physical installation).
This method allowed them to have the 3d model connected directly to the projector and then they only had to tweak the placement of each ball to make it match the physical one.
What was very tricky was replicating a 3d model of the installation physically, as each ball had to be placed in exactly the same place as it's 3d counterpart. This build was probably the most complicated he has ever done!
They then had to create a UV map that would allow them to communicate with the software and create light trajectories that could be projected onto the physical model.