Hi,
Unreal and Godot can bake lights for a scene, I think it is a must have feature for modern 3d engines.
Here is a solution: http://www.pmavridis.com/data/VolumeBasedDiffuseGlobalIllumination_final.pdf
It seems not too difficult to achieve, the only issue is the voxelization step is relatively costly in realtime.
But if we bake for static lights and static scenes, it’s not a problem.