An anonymous reader writes: ZeniMax Media, the parent company of both Bethesda Softworks and Id Software, says it will prove at trial that John Carmack and others at Oculus stole trade secrets to "misappropriate" virtual reality technology that was first developed while Carmack was working at Id Software. What's more, ZeniMax is now accusing Oculus of "intentional destruction of evidence to cover up their wrongdoing." Mark Zuckerberg, CEO of Oculus parent company Facebook, is scheduled to respond to those accusations in testimony starting tomorrow, according to a report by Business insider. ZeniMax's statement comes after Carmack testified at trial last week, saying the case was "ridiculous and absurd." His testimony echoed Oculus' initial reaction when ZeniMax's accusations first surfaced in 2014. In court filings leading up to the trial, ZeniMax detailed its case that Carmack, while still an employee at Id Software, "designed the specifications and functionality embodied in the Rift SDK and directed its development." Carmack's technology and guidance allegedly "literally transformed" Oculus founder Palmer Luckey's early Rift prototype from a "primitive virtual reality headset" that was "little more than a display panel." Carmack allegedly used "copyrighted computer code, trade secret information, and technical know-how" from his time at ZeniMax after he moved to Oculus as CTO in 2013. As the trial began last week (as reported by a Law360 summary, registration required), Carmack told the court of his development of a virtual reality demo for Doom 3 in 2012 and his search for a VR headset that would be suitable to run it. That's when he says he got in touch with Luckey, leading to the now legendary E3 2012 demo that introduced Oculus to the public. ZeniMax is seeking $2 billion in damage, which matches the value that Facebook paid for Oculus in 2014. The trial is expected to last three weeks.