2011

Table Of Contents
To:Use:
Set the color of displayed vectors. Click on the color pot to display the
color pickersee Color Picker on page 154.
Color
NOTE The Blur tool has a masking inputsee Pixel Masking on page 560. The Blur
tool's X and Y attributes are both animatable by setting keyframes or using
expressionssee Setting Keys Manually on page 676 and Validating and Applying
the Expression String
on page 729.
Vector Motion Blur with Extended Alpha
The extended functionality of the Blur node requires an alpha channel on its
motion vector input. Since Maya does not allow you to generate motion
vectors with an alpha channel, you should copy it from your diffuse/beauty
pass in Composite using a SetAlpha node. This should give you the desired
result.
You can see the effect of extending the motion vectors outside of the moving
object by turning on the view vectors option in the Vectors tab of the Blur
tool.
The Blur node interprets the alpha channel of the Input Image input differently
than the alpha of the motion vectors. This allows you to selectively motion
blur objects of an opaque RGB image. Ensure that OpenEXR files are used
when rendering motion vectors in Maya.
The first of the following two images displays the Blur node without the Alpha
Extend, the second is with the Alpha extend.
NOTE To extend the vectors beyond the edge, you must increase the Max Radius.
398 | Chapter 17 Image Processing Tools