Apple Shake 4 Tutorials - Manual (Page 146)

146 Tutorial 4 Working With Expressions
As a result, the RGrad gradient shape appears only where there is no alpha in the
ceiling/fan composite. RBlur1 now has a slightly more interesting effect.
5 In the RBlur1 parameters, do the following:
• Set iRadius to 0. (There is no area of the center that is non-blurred.)
• Set oRadius to 300. (This sets the blur amount.)
• Set amplitude to 1. (This is a multiplier on oRadius—the greater the number, the
more blur; also affects the rendering speed.)
• Set quality to 0.1. (The quality is lowered to speed rendering.)
Linking the RBlur effect to the RGrad shape
Although the light is moving, the rays are emanating from the same static position. To
improve the effect, animate the center of the RBlur, and match it to the center of
RGrad1. The best way to do this is to link the xCenter and yCenter parameters of RBlur1
to the xCenter and yCenter parameters of RGrad1. Then, if RGrad1 is modified, RBlur1 is
automatically adjusted.
To link a parameter to another parameter within the same node, type the name of the
parameter. To link to a parameter in a different node, type the name of the node, a
period, and then the parameter name (NodeName.parameterName). Node names and
parameters are case-sensitive, and Shake does not tolerate typos!