Rtgi Free [best]

Enable "Fast GI Approximation" for previews, and use the "Intel Open Path Guiding Library" (free with Blender 3.0+) to remove fireflies in dark scenes. You get production-level RTGI used by Netflix and Ubisoft—for zero cost.

| Method | Cost | Speed | Quality | | :--- | :--- | :--- | :--- | | | Free (Time) | Slow (Render time) | Perfect (Offline) | | UE5 Lumen (Software) | Free (Performance) | Fast (Real-time) | Very High | | ReShade SSGI | Free (Performance) | Very Fast | Good (Screenspace only) | rtgi free

No plugins. No royalties. Just free RTGI. Enable "Fast GI Approximation" for previews, and use