2008

NOTE To control whether or not the renderer uses the environment map's alpha
channel in creating the alpha for the rendered image, choose Customize >
Preferences > Rendering, and then turn on Use Environment Alpha in the
Background Antialiasing group. If Use Environment Alpha is turned off (the default)
the background receives an alpha of 0 (completely transparent). If Use Environment
Alpha is turned on, the alpha of the resulting image is a combination of the scene
and background image's alpha. Also, when writing TGA files with Pre-Multiplied
Alpha set to off, turning on Use Environment Alpha prevents incorrect results.
Note that only background images with alpha channels or black backgrounds are
supported when compositing in other programs such as Photoshop.
Event
The event is the basic unit of organization in a Particle Flow
particle diagram
on page 7885 . There are two types of events: global on page 7801 and local on
page 7831 . A
birth event on page 7728 is a specialized type of local event.
7770 | Glossary