The Velocity Render Element is a color or grayscale image that stores velocity information about objects that have moved between the current frame and the next frame.
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The parameters for this render element appear in the Attribute Editor under Extra V-Ray Attributes.
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A common workflow for using this render element is to first locate the frame in the sequence that has the most motion, render the frame in Maya with the Velocity Render Element enabled, and then note the Max Velocity in last frame value, which is displayed in the parameters for this render element. Finally, enter this value (or a slightly larger value) for the Max Velocity parameter when rendering the entire sequence. This workflow provides the maximum range of colors in the Velocity Render Element for the most flexibility during compositing.
The Velocity Render Element is useful for adding motion blur in post production at a composite level without the need for re-rendering. In the composite shown below, motion blur was added based on the amount by which the color differs from medium gray. The Robot arms and the creature that were given a pale yellow color in the render element are the most blurred.
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Beauty Composite with motion blur added
using the Velocity Render Element
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