Understanding the Principles of Light Behavior - Photographic Rendering with V-Ray for SketchUp - page 169

A quick set of test renders (see the following image) reveals the different levels of
illumination that these identical lights bring to their respective environments. In the
small room, the walls themselves receive a fair amount of light; in the larger room,
the walls are left pretty much in complete darkness.
The difference in illumination levels seen here demonstrates in a very visible way the
Inverse Square law at work. Understanding how this law works and affects the be-
havior of light in any given situation will certainly help us make good judgment calls
when it comes to creating and balancing proper illumination levels in the digital en-
vironments that we are building.
Decay types available in V-Ray for SketchUp
Having gotten to grips with how real-world light decay works, it would probably be
good if we now spent some time considering the decay types that are available when
working with V-Ray lights in SketchUp. For ease of reference, we will discuss each of
the available decay types themselves as separate headings, noting as we go which
V-Ray light object makes use of them.