John Carmack resigned from his position at Meta Platforms Inc. (NASDAQ: META) virtual reality unit out of frustration with its slow progress and clash of strategy with founder Mark Zuckerberg.

The games industry veteran said in his resignation note that he never felt adequately able to influence Meta’s VR effort in the right direction, Bloomberg reports.

Carmack, 52, joined virtual reality developer Oculus in 2013 before being acquired by Meta in 2014.

Also read: Mark Zuckerberg’s Metaverse Strategies Raise Concerns From VR Developers

Carmack started at Oculus as CTO, where most recently he was an executive VR consultant at Meta acting as a candid internal reviewer.

Carmack’s id Software produced classic first-person shooters Earthquake Y Condemn and helped introduce 3D graphics to the PC…