150 Captures from the Cosmopolis 'Making of' featured only on the French Blu Ray DVD. Most are spoilery so they're behind a cut for those who haven't seen the movie yet.
(You can order your DVD HERE and the Blu Ray HERE)
The Art of VFX interviews James Cooper, the lead compositor on Cosmopolis and he discussed the film's visual effects at length and mentioned Rob. Here's an excerpt of the interview + new images from the film. Sometimes Eric Packer occults the windows limo. Was there an on-set effect or is it your work? It was a combination of both, actually. Initially that was to be a practical effect but David wanted to have options as to when the windows became fully opaque and when they returned to tinted transparency. To this end he shot the parts of the sequences where he was certain they would be opaque practically but left numerous shots on the front and back end of those shots as greenscreen. This allowed him much more control as to the timing of when the windows fell into darkness and for how long and gave us references as to what they would look like fully darkened.