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I'm not sure what I need to use, collections, compositing, masking or something else.

I want my final render to include two objects.

One object has motion blur. The other object is the same dimensions, material, etc as the first object and is in the same location but it has no motion blur. I want the object with no motion blur to be “in front” of the the object with motion blur and I do not want any optical interaction between the two objects (no blending of the two and no shadows from from object to the other, etc.)

There is a also a background. This can go in the same collection as the object with motion blur.

I am using Cycles.

I have avoided mentioning Collections, etc, because I do not have any preferred method. The best method will do!

Here is a crude illustration of what I want to achieve in Blender:

Picture 1: the object with motion blur and background.


Picture 1

Picture 2: the object with no motion blur (has a transparent background).
 Picture 2

Picture 3: the two combined.


Picture 3

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  • $\begingroup$ Hi Please use a title that reflects the content of the question. It should be descriptive but succinct, unique and identifying, summarizing the issue so that users can at a glance understand what your post is about. Use the edit link below your post and avoid anything not strictly essential to the post. Remember, your title is the first thing potential visitors will see, and makes your question findable for future users. See "What is the problem with posting an image or link and asking “How do I do this?"" $\endgroup$
    – Duarte Farrajota Ramos ♦
    Dec 27, 2022 at 13:36
  • $\begingroup$ Yes you should probably look into the Compositor to do what you want $\endgroup$
    – moonboots
    Dec 27, 2022 at 14:19

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