rtgi (real-time global illumination) is an open-source project that implements dynamic global illumination techniques for real-time rendering. Version 0.17.0.2 continues the project’s steady evolution: it tightens performance, expands platform compatibility, and refines quality-vs-cost trade-offs. This column examines what’s new, how the internals behave, practical integration concerns, and when you should — or shouldn’t — adopt this release.