How to use V-Ray Velocity pass with ReelSmart Motion Blur (RSMB) plugin?

Download the project files. (Software used: 3ds Max 2022; Forest Pack 7.1.2; After Effects 2021; NukeX11.3v1)
 

Overview

The VRayVelocity render element can be used to add motion blur to your render in compositing. This guide describes how to use the VRayVelocity pass with the ReelSmart Motion Blur plugin in Adobe After Effects and Nuke. 

 

Setting up the VRayVelocity pass and render output

1. Add a VRayVelocity render element.

   Where to find the element:

   • 3ds Max
   • Maya
   • Cinema4D
   • Houdini
   • Blender

2. Set the Max velocity parameter.

   To know what value to add, find a frame where the movement is the fastest and render it. Afterwards, look at the Max velocity in last frame parameter's value in the VRayVelocity element. Use a slightly higher value than the one displayed.
   
    

   

    

3.  Set the output.

   In this tutorial, we'll output the sequence, using the .exr format, through V-Ray's Separate Render Channels option.

   Where to find the option:

   • 3ds Max
   • Maya
   • Cinema4D
   • Houdini

   • Blender
     Use the Blender native output properties.

      

   

4. Render

    

Using the RSMB plugin in AfterEffects

1. Create a new composition, then load the RGB and Velocity sequences

2. Ensure the Preserve RGB option is active for the Velocity sequence
   This will disable Color Management conversions for the element so as not to distort the values.

   
   Right-click on the Velocity sequence, then go to Interpret Footage > Main, and in the Color Management tab, enable Preserve RGB:
   
    

   

   
   
    

3. Add the RSMB Pro Vectors effect to the RGB sequence:

   Go to Effect menu > RE:Vision Plug-ins > RSMB Pro Vectors.

4. In the Effect Controls panel, select the velocity sequence from the Motion Vectors drop-down menu:
   
    

   

   
   
    

5. Set the same value for the Max Displace as the one you used for the Max Velocity parameter in VRayVelocity render element.
   
    

   

    

6. Control the motion blur of the footage via the Blur Amount parameter.

7. Render the result.

    

Using the RSMB plugin in Nuke

1. Create a new composition
2. Load the RGB and VRayVelocity sequences in 2 Read nodes.

3. Ensure the Colorspace in the Read tab of the VRayVelocity Read node to "Linear":
   
    

   

   
   
    

4. Add the RSMB PRO Vectors node.

5. Connect the RGB Read node to the Source of the RSMB PRO Vectors node and the VRayVelocity Read node to the Motion Vectors:
   
    

   

   
   
    

6. In the Properties panel of the RSMB Pro Vectors node, set the same value for Max Displacement value as the one you used for the Max Velocity parameter in VRayVelocity Render Element
   
    

   

    

7. Control the motion blur of the footage with the Blur Amount parameter.
8. Render the result.