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The Velocity Render Channel is a color or grayscale image that stores velocity information about objects that have moved between the current frame and the next frame. 

 

Overview

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The Velocity Render Channel stores surface velocity for moving objects in the scene with different colors representing different velocities. Each moving object is rendered with a flat color or gradient. It is commonly used to create mattes for adding motion blur in a composite.

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Note: Specific objects can be excluded from this Render Element by disabling the Generate Render Elements option in the VRayObjectProperties node for the selected object(s).

 

UI Path

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||out Network|| > V-Ray Render Elements node > V-Ray > Render Channel > Velocity

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||mat Network|| > V-Ray > Render Channel > Velocity

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Parameters

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The parameters for this render channel appear in the Parameters tab under the out Network and within the render channels node.

 

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Name – The text added to the end of the rendered file, when saved as a separate file (e.g. myrender.Velocity.vrimg).

Clamp Velocity – When enabled, sets the limit for the Max Velocity value to 1 for floating print images, 255 for 8-bit images, or 65535 for 16-bit images. This option is useful only when writing to an 8-bit or 16-bit file format.

Max Velocity – Used to scale the velocity values written to the render element so that they fit within the range specifies by

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the Clamp Velocity

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 parameter. This is only useful if writing to an 8-bit or 16-bit file format.

Ignore Z – Disregards motion along the Z axis.

Filtering

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 – Applies the image filter to this channel. Image filter settings are in

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the AA sub-tab

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 of the Sampler tab

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 of the  V-Ray

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 Renderer node.

Deep Output – Enables deep output.

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Notes

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Fancy Bullets
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  • It is recommended to disable this render channel when rendering with Motion Blur. This channel is generated when 3D motion blur is enabled in V-Ray. However, the pass will also be motion blurred along with the rest of the image. This will make the element not usable in compositing.

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