 | | | Global Illumination | Global Illumination 2005-05-20 - By Peter MacDougall
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Global illumination is a render room setting, in the render room
properties tray. Basically you setup your lighting, atmosphere and so on
in the assembly room then go to the render room and turn on indirect
lighting and sky light by clicking on the checkboxes in the properties
tray in the render room where you can select other features of the
render like light through transparency, raytracing vs draft and so on.
In general it is a good idea to turn off ambient lighting in the scene
settings (assembly room, select scene in the object list, click on
ambient light and set to 0%).
The sky light will generate illumination as if the whole sky is emitting
some light and the colours and settings are determined by what you
choose in the background tab in the scene settings.
Indirect light is bounced light from any light source in your scene and
will create emitted light for any object that has a value >0 in the glow
channel. Indirect lighting mimics the effect of real light bouncing
around in a scene such as the side of an object having a red tinge
because it is receiving light that bounced off a nearby brightly lit red
wall.
Finally caustics mimic the effect of light being focussed as it passes
through refractive and transparent objects or highly reflective objects.
There was a good article about all of this in an issue of 3dXtract
www.3dxtract.com
Ashley Perrien wrote:
> I'm new to Carrara 4 and am trying to figure out how to best light a scene
and have read and
> seen references to Global Illumination and Indirect Lighting in one of the
3Dxtract PDFs and
> also in the manual but for the life of me I can't find the setting anywhere
in the program. The
> help pdf starts on about it on page 844 and says to "Check the Sky Light
checkbox in the
> Global Illumination panel." Where in Carrara 4.1.1 is the Global Illumination
panel?
>
> TIA
>
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>
> Welcome Yahoo Members!
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--
Peter MacDougall
pem@(protected)
http://www3.telus.net/pem/index.htm
Reality always exceeds your expectations.
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