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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).

 

 

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UI Path: ||out Network|| >  > V-Ray Render ChannelsElementsnode > V-Ray > Render Channel sub-menu > Velocity Velocity


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.

 

Image Modified

 

 

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

Clamp Velocity – Sets the limit for Max Velocity. When enabled, this option limits the max velocity value to 1 for floating point 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 channel so that they fit within the range specified by the Clamp Velocity parameter. This is only useful if writing to an 8-bit or 16-bit file format. 

Max Velocity Last Frame – Shows the maximum velocity value that was found while rendering the last image. This is a read-only parameter and can be used as a guide for setting the Max Velocity parameter.

Ignore Z – Disregards motion along the Z axis.

Filtering – Applies the image filter to this channel. Image filter settings are in the AA sub-tab of the Sampler tab of the  V-Ray Renderer node.

 

Suggested Workflow  

A common workflow for using this render channel is to first locate the frame in the sequence that has the most motion, render the frame in Houdini with the Velocity Render Channel enabled, and then note the Max Velocity Last Frame value, which is displayed in the parameters for this 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 Channel for the most flexibility during compositing.

 

 

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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