How about a global illumination solver.
This would be really useful... yes it would take some time for it to solve the GI for a complex scene, BUT you would have GI in the scene.
Now keep in mind that this means everytime you move an object or a light or... well ... anything effected by light including the lights themselves... or the texture of an object even, the GI would have to be recalculated... so there WOULD be KIND of a render time, but for the most part this would be ok.
You'd really only build the GI when you are done setting everything up.
Now the other thing is what about objects that will be moving like characters and props... Well the dynamic lights with shadows will have to take care of those so the characters and some things might not be lit with exact GI, but tricks could be done to make them blend in correctly.
Now there was an engine (made by the creators of Sonic the Hedgehog) that made a GI setup that somehow worked in realtime so all the moving objects were lit correctly as well.
Here's some info on that.
http://www.sonicstadium.org/news/see-how-the-hedgehog-engine-works
But a simple GI solver would do just as well for now.
Any comments?
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