Deceased games producer Terminal Reality, which has re-emerged as a private company controlling the patents around its Infernal Engine game rendering software, is suing Microsoft for using its lighting and shadowing patents in its games, including Halo 5. We’re torn by this one, in that methods for creating shadows in games go back well into the early 1990s and there is plenty of prior art, much of it expired. Even the legendary ID Software (wrote Doom) got into shadowing issues when the man who invented its shadowing algorithms found that his co-worker had sold the patents to someone else and he could not open source them when Doom 3 came out. That was back in the 1998 time frame, and…