> You can't spend a decade writing an engine. In fact, proprietary engines that are less than a decade old and have exceeded their commercial usefulness are of

> You can't spend a decade writing an engine. In fact, proprietary engines that are less than a decade old and have exceeded their commercial usefulness are often open sourced. https://github.com/TTimo/doom3.gpl https://github.com/TTimo/doom3.gpl