Blender user “0451” just released a free SSGI addon for EEVEE on his Gumroad page.
His addon cleverly combines all the scene’s materials with Screen Space reflections, allowing for this screen space GI effect. This gives it the benefit of working “realtime” straight from the viewport, on top of EEVEE’s traditional baked GI which uses probes. It also allows for the screen space GI to be dynamic and animatable.
another realtime SSGI test in Blender (the viewport was smooth, the screengrab ended up being laggy). pic.twitter.com/sPPuvh8MSu
— Gleb Alexandrov (@gleb_alexandrov) August 21, 2020
The addon is very light, check out the Gumroad link if you want to give it a try, or pop into the Blender Artists thread if you want to know more.