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