Vectorstein was a Wolfenstein 3D project by Commodore. It was announced in March 2005, and a number of screenshots were posted. It was to feature an otherwise ordinary setting, but with vector graphics rather than bitmap graphics.
Apparently there were issues in terms of getting new sounds and some basic coding issues were also present. Though being complimented from a host of other DHW users in its thread, progress on the project stalled a few days after the thread had been created.