I've never had a problem with that, and it's pretty straight forward IMO.
Work computers stay at work. My computers stay at home (or at least not at work). If I create something outside of work, not using proprietary data/algorithms/whatever from work, and using my own computers, then it's mine. I'd never work somewhere that tried to claim ownership of work I did outside of work.
Needless to say, common sense applies, and it's probably not a good idea to have a side project that competes with your employer (even indirectly), helps their competition, or makes them look bad somehow.
Work computers stay at work. My computers stay at home (or at least not at work). If I create something outside of work, not using proprietary data/algorithms/whatever from work, and using my own computers, then it's mine. I'd never work somewhere that tried to claim ownership of work I did outside of work.
Needless to say, common sense applies, and it's probably not a good idea to have a side project that competes with your employer (even indirectly), helps their competition, or makes them look bad somehow.