Apple Shake 4 - Manual (Page 804)

804 Chapter 26 Transformations, Motion Blur, and AutoAlign
• shutterTiming: A subparameter of motionBlur used to specify shutter length. 0 is no
blur, whereas 1 represents a whole frame of blur. Note that standard camera blur is
180 degrees, or a value of .5. This value is multiplied by the global shutterTiming
parameter.
• shutterOffset: A subparameter of motionBlur representing the offset from the current
frame at which the blur is calculated. Default is 0; previous frames are less than 0.
Scroll
The Scroll node is similar to the Pan node, except that the image wraps around the
frame, and reappears on the opposite side. Because there is no way to track a pixel,
there is no motion blur available in the Scroll node.
Parameters
This node displays the following controls in the Parameters tab:
xScroll, yScroll
The X and Y panning values.
motionBlur
Motion Blur quality level. 0 is no blur, whereas 1 represents standard filtering. For more
speed, use less than 1. This value is multiplied by the global motionBlur parameter.
• shutterTiming: A subparameter of motionBlur used to specify shutter length. 0 is no
blur, whereas 1 represents a whole frame of blur. Note that standard camera blur is
180 degrees, or a value of .5. This value is multiplied by the global shutterTiming
parameter.
• shutterOffset: A subparameter of motionBlur representing the offset from the current
frame at which the blur is calculated. Default is 0; previous frames are less than 0.
SetDOD
The SetDOD node limits the active area, or Domain of Definition (DOD), to a limited
window. If you have a large element with only a small portion of non-black pixels, you
can apply a SetDOD node to isolate the area and to speed all image processes.
Shake automatically assigns a DOD to an .iff image. For example, if you scale down an
image, Shake limits the DOD to the scaled area. This remains in effect for later
composites, but does not affect the current script.
You can procedurally access the DOD of an image with the following variables:
• dod[0] Left edge of DOD
• dod[1] Bottom edge of DOD
• dod[2] Right edge of DOD
• dod[3] Top edge of DOD
For example, calling FileIn1.dod[0] returns the minimum X value of the FileIn1 node’s
DOD.