2012

Table Of Contents
For fast previews, set the Error Bound parameter high, and the Min
LOD parameter small.
For best results, set the Fall Off option to Inverse Square Law, and
turn on Auto Exposure.
Image-based Lighting
Image-based lighting is where an image is used to light a scene. In the real
world, every object is lit not only by light sources like the sun, lamps, and so
on, but also by everything around. Standing in the middle of a street, a person
will be lit by the sun, the blue sky, the brown buildings and the grey street.
Emulating this form of lighting clearly has the potential to create incredibly
realistic images.
Images used in this lighting method are a special kind of image, called a High
Dynamic Range Image or HDRI. This type of image has the capability of
lighting a scene with incredible accuracy. In the Presenter window, an HDRI
is wrapped around the scene as a sphere, and color and brightness from the
HDRI are cast onto the 3D model to light it.
576 | Chapter 13 Create Photorealistic Visualizations