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This tutorial will teach a few tricks to simulate radiosity. That means that
this isn't REAL radiosity it's just a way of faking it.
There is something called a "Cornell box". A Cornell box is a room with two
strong contrast colored walls and different lights. The room is square. It's
used as a research tool at the Cornell University for the department of light
studies.
So to show this technique I've made a cornellbox in 3D studio max 2.5 and set
up some lighting parameters to show how we can achieve some of the radiosity
effect.
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I created a cube, made three materials, one red, one blue and one light grey. I
made one light and set some attentuation parameters. Then I copied the lights so
that one is infront of the left, right and bottom wall. The light at the top is
just a square with a 100% self illuminated material. Here you can see the
light setup from the front view. |
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Now here is the trick. The color of the light infront of the blue wall is set to
light blue. I also brought the multiplier down to about 0.6. And the most
important thing is to uncheck "Affect Specular". This way the objects in the
scene will only get a specular from the top light.
The light infront of the red wall is set to light red color and the same
parameters as the blue. The bottom grey is set to grey and the same as the
others. The top light is set at 1.0 in multiplier and light grey color, and
"Affect Specular" checked.
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Here you see the result. See how the blue color seem to bounce off the blue wall
and the same with the red wall and mix to a purplish color in the middle.
This is a nifty little trick, and can really improve lighting in scenes.
Hope it can help someone.
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