8

362 Chapter 19: Video Post-Production
Inter face
You can set the following controls in the Setup
Options:
Source Camera—Lets you choose from a list of
cameras in the scene. Choose the same camera as
the one being used to render the scene.
General—Sets the brightness range and size of the
stars.
Dimmest Sta r—Specifies the dimmest star. Range
= 0 to 255.
Brightest Star—Specifies the brightest star. Range
= 0 to 255.
Linear/Logarithmic—Specifies whether the range of
brightness is calculated linearly or logarithmical ly.
Star Size (Pixels)—Specifies the size of the stars, in
pixels. Choose any value from 0.001 to 100.
Motion Blur group
These settings control the streaking effect of the
stars when the camera moves.
Use—Determines w hether to use the motion blur.
If clear, the stars appear as dots, no matter what
the camer a’s motion.
Amount—Thepercentageoftheframetimethat
the camera "shutter" is open. Default = 75% .
Dimming—Determines how the streaked stars w ill
dim as their trails lengthen. The default of 40
provides a goo d effect for video, dimming them a
bit so they don’t appear to flash.
Star Database group
These settings specify the number of stars in the
starfield.
Random—Generatesthenumberofstarsindicated
by the Count spinner, using the random number
Seed to initialize the random number generator.
Custom—Reads the file spe cified. A provided star
database,
earth.stb , contains the brightest stars in
Earth’s sky.
Seed—Initializes the random number generator.
By using the same Seed value in different
animations, you’re guaranteed identical starfields.
Co un t—Specifies the number of stars generated
when Random is chosen.
Compositing group
Background—Composites the stars in the
background.Thisisthedefault.
Foregroun d—Composites the stars in the
foreground.