Global illumination : explanation please?

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  04 April 2002
Global illumination : explanation please?

Could someone please explain what Global Illumination actually does? It is something like a "bigger brother" to radiosity? Thx!
"Searching for magic everywhere..."
  04 April 2002
I'm not an expert of GI, so somebody correct me if I'm wrong, but AFAIK global illumination means all kinds of indirect lighting in general. It includes bounced light (radiosity) and effects like caustics etc. So I'd say it's a bit more than just a "big brother" of radiosity.
  04 April 2002
(Yay! First post at the forums )

As LiiMuRi said, GI indeed is the big brother of radiosity, though I don't think it would include caustics, as caustics are completely different thing than GI. Radiosity is just the diffuse bouncing of light in the scene, but GI consists the bouncing of specular light, diffuse light and so on.
So GI is the full package, while radiosity is just one small part of the bigger effect called GI.

Hope this helped.
  04 April 2002
Great, it clears things up!
"Searching for magic everywhere..."
  01 January 2006
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