2010

Table Of Contents
Beyond the Lesson
In this lesson you were introduced to the Global Illumination features provided
by the mental ray
®
for Maya
®
renderer. You learned that:
The mental ray for Maya renderer provides a feature that simulates indirect
illumination in the Maya scene called Global Illumination.
Global Illumination allows you to achieve realistic lighting effects for
objects and areas of the scene that do not receive direct lighting.
Photons are used to measure the Global Illumination of the scene via the
creation of a photon map.
The brightness of the Global Illumination in a scene is controlled by the
Photon Intensity.
The quality of the Global Illumination effect is dependent on the number
of photons emitted into the scene, the Accuracy, and the Radius attribute
settings.
Multiple test renders are often required to achieve the desired final image.
Light sources for Global Illumination
Point, spot, and mental ray area lights can be used as light types for Global
Illumination with the mental ray for Maya renderer. A Directional light does
not work as a source for Global Illumination because this light type does not
have a defined point of origin (that is, the rays emit in a parallel manner).
Photon maps
You can visualize the photon mapping that occurs at the beginning of the
rendering process provided you turn on the Enable Map Visualizer option in
the Caustics and Global Illumination > Photon Tracing section of the Render
Settings window. To view a visualization of the photon mapping, select
Window > Rendering Editors > mental ray > Map Visualizer.
Beyond the Lesson | 517