Global Illumination

Global Illumination

Post by Steve » Tue, 16 Sep 2003 12:57:05

Hey Everyone,
I read a bit about something called Global Illumination. Does it have
something to do with Radiosity or something completely different? Any
advantages, disadvantages?

Global Illumination

Post by Adrian McK » Tue, 16 Sep 2003 13:48:00

I think it pretty much IS radiosity.

Subtle shading effects
More realistic rendering
Realistic assessment of lighting conditions

Can take a bit to get used to
Takes a lot longer to render (particularly for animations)




Global Illumination

Post by stefke » Tue, 16 Sep 2003 22:09:31

Global Illumination = all techniques to describe realworld lighting (from a
renderer point of view)

It can contain several techniques combined:
- raytracing (aka local illumination)
- radiosity
- monte-carlo raytracing
- irradiance caching
- photon mapping

--- stefkeB ---

Global Illumination

Post by Neil » Wed, 17 Sep 2003 08:11:44

Hi All,

As Adrian notes, Global Illumination is a generic term
for a range of solutions (including radiosity and monte
carlo interpretations) that seeks to go beyond the simpler
light-object-shadow model as used in Direct Illumination
(the most common example of which is ray tracing).

I've also recently been researching the issue and found
a good (IE in plain english, so you can understand it!)
resource on 3d graphics at:

http://freespace. *** .net/hugo.elias/graphics/x_main.htm

With the specifics of radiosity at:

http://freespace. *** .net/hugo.elias/radiosity/radiosity.htm

On this note (and having asked the Lightwave user group
without response), does anyone know of any sites that allow
you to compare the radiosity output of various applications
(using a common scene set-up) side-by-side - probably
including Cinema 4D, 3DS Max, Lightwave, Maya et al? Also,
does anyone know if it is possible to use alternative
renderers in Cinema 4D (through a plug-in, for example)?

Kind Regards,


Global Illumination

Post by stefke » Wed, 17 Sep 2003 17:53:58

The Hugo Elias links are very good.

Why would anyone want to change to a different renderer in Cinema4D ? I was
thinking that it would be interesting to have the Cinema4D rendering engine
inside max ;)

A real comparison?
- -> Sibenik, Sponza, Postsparkasse, Broschi
- ; look at rendering comparisons
- -> Render Study -> render comparison. This is my own
effort ;)

--- stefkeB ---