Apple Shake 4 - Manual (Page 603)

Chapter 22 Shake-Generated Images 603
density
The density of the pixels, from 0 to 1. A lower density results in fewer random pixels.
seed
Changes the random pattern of noise that’s created. When Shake generates a random
pattern of values, you need to make sure for purposes of compositing that you can
recreate the same random pattern a second time. In other words, you want to be able
to create different random patterns, evaluating each one until you find the one that
works best, but then you don’t want that particular random pattern to change again.
Shake uses the seed value as the basis for generating a random value. Using the same
seed value results in the same random value being generated, so that your image
doesn’t change every time you re-render. Use a single value for a static result, or use
the keyword “time” to create a pattern of random values that changes over time.
For more information on using random numbers in expressions, see “ Reference Tables
for Functions, Variables, and Expressions ” on page 941.
RGrad
The RGrad node generates a radial gradient. You can also control the falloff to make
circles. For a simple color ramp, use the Ramp node. For a four-corner gradient, use the
Grad node.
Parameters
This node displays the following controls in the Parameters tab:
width, height
The width and height value fields in the Res parameter set the size of the generated
image.