This tutorial attempts to explain how to use Motion Vectors in Nuke. It will specifically deal with how to apply motion blur relative to the of motion of an object within 3d space. For example, think of a car moving in a rotational & linear fashion, the amount of motion blur applied is relative to the objects distance (from the camera), speed and acceleration. This is represented in the form of CG data, otherwise know as a Motion Vector which is a rendered pass output from a 3D animation package.
In this tutorial, we will be reading in such CG renders output from Mental Ray into Nuke. Each render will contain a Motion Vector pass which I will utilize by piping them into a Vector Blur node. I will then conclude the tutorial by explaining what the are the trade-offs of using the Motion Vectors n Nuke. I will then show you the final results by comparing a motion blur render vs a non motion blurred render.
Like always, if you have any questions, queries or comments regarding this tutorials please PM me or leave a comment bellow. I’ll be more than happy to chat about this with you 🙂