Cornell Box Comparison

I simply duplicated a cornell box to get a better understanding of radiosity. I made my own cornell box to be very similar to the orginal that everyone knows about. Only I used the same scene with three different types of lighting. I learned quite a bit from this exersize and I wanted to share it. One fact is this- Ambient Occlusion is not “fake radiosity”.

Basic Lighting:

Ambient Occlusion:


Whoever said that AO is fake radiosity ? The third one is a very good example of radiosity… the colours bleed onto other objects … Hmm I can’t help but love radiosity…

Nice tests. And yeah, AO isn’t fake radiosity.


how do u do the third one :o .

I have to ask, did you use the vertex shading fake radiosity, or is there a way to do it in yafray? I’ve tried using “yafray GI” with photons but it always comes out grainy and ugly.

B Manx2000,

Here is an older tutorial on how to use radiosity in blender. Please note the screenshots are from older Blender versions as well. The settings an explanations should help you to understand how to set up your objects and scene for a radiosity rendering.

Hope this helps.

It’s radiosity people! RADIOSITY! read the documentation.

If you use photons you have to use a high number to minimize grain.

How high a number? I used a million photons but it still came out like this:

You know, I had a problem with rendering the Radiosity in Blender so I simply used the Radio Tool and hit the Replace Meshes button. Then I rendered it(this method would be faster with animations). I do not intend to use radiosity in any of my renderings or movies unless it is with Yafray.

try turning off tune photon! i think that that is your problem - the blotchy is caused by the photon map being shown (for tuning) turn it off and you should have a perfect image!

No, no no. Tune photons MAKES it blotchy, with it off it looks grainy. Is there something I have to do with radius and mixcount?