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Here are two renderings of the famous Cornell Box. The top image
was rendered by the software (and possibly some hardware) at the
Cornell University Program of Computer Graphics. There seems to be
a small error in this image. Take a look at the bottom left corner
of the small box and you will see a light leak, which gives that
corner the illusion that it is floating.
The bottom image was rendered with Blender 1.80. As you can see,
Blender's radiosity solution is very similar. There is a slight
shadow leak on the bottom left edge of the tall box, but there is
no light leak on the small box. I obtained the original Cornell Box
Data and tried to guess the rgb values from the reflectance
spectra. Anyone know the right way to do this? If the rgb color
values were more accurate, the images would be even more identical.
This image was solved in about 30 minutes and rendered in 3 seconds
on a PII 450MHz. Please note that I let the radiosity calculation
run until it was finished. In case you want to render your own
tests, you can download the cornell-box.blend scene file 21KB. The
following settings were used:
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PaMax: 250
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PaMin: 100
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Hemires: 1,000
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ElMax: 50
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ElMin: 10
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MaxEl: 20,000
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Radiosity hints for Blender 1.8 users:
- Quality and rendering time increase as the Patch and Element
variables approach their minimum values, and as the Hemires and
Maximum Elements variables approach their maximum values.
- You can divide the 'Radiosity solving time' by 6,000 to get the
time in minutes.
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