There are more than two, Unreal has a coordinate system so special that Tim Sweeney apologized for it. https://mobile.twitter.com/timsweeneyepic/status/9526614

There are more than two, Unreal has a coordinate system so special that Tim Sweeney apologized for it. https://mobile.twitter.com/timsweeneyepic/status/952661474501111808 https://mobile.twitter.com/timsweeneyepic/status/95266147450...