Java™ Media APIs: Cross-Platform Imaging, Media, and Visualization

Policy Matters

As we said earlier, the Java 3D renderer needs to know where the eyes are relative to the screen. This information uniquely defines the view frustum and constitutes the first part of the viewing computation. Given the eye to screen transforms, there are a number of options for using that information to render a frame. Java 3D sets most of these options through policies. The name policy might sound a bit foreboding, but it's really nothing more than a set of rules and operating principles. The idea here is that policies establish the general set of rules for rendering views and really serve to group the options in a logical fashion.

Commonly Used Policies

Several primary policies exist that pertain to most situations. They are as ...