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Paul Clements avatar image
Paul Clements asked ·

Motion blur and AOVs

Hi there - I am rendering a scene with motion blur and comping in after effects. The AOVs render without the motion blur applied, so when I come to comp the scene using the depth pass for example, there are hard edges everywhere that should be blurred.

How do people tend to deal with this issue?

motion blurafter effects
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Paul Clements avatar image
Paul Clements answered ·

Thanks Peter, that has fixed it. I have replaced the Z pass and my comps instantly look correct!

It might be worth considering having Z as anti-aliased by default, personally I cannot think of a use that would require it to be aliased.

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Peter Horvath avatar image
Peter Horvath answered ·

Check out this thread:

https://answers.arnoldrenderer.com/questions/74/how-do-i-use-z-depth-aov-passes-from-arnold-within.html

It shows you how to make the Z pass anti-aliased by changing the filter type to gaussian.

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Paul Clements answered ·

Hi Stephen,

Thank you for your reply. Looking at the Z pass more closely, it looks like there is some kind of motion blur going on, but the edges have a completely different quality than the beauty pass...

I think maybe because the Z AOV is aliased, it looks dithered and much sharper which is why it is causing issues in compositing.

Is there something I am missing? Is the general practice to render and comp without motion blur and then add it in post via motion vectors?

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Stephen Blair avatar image
Stephen Blair answered ·

Hi

I see motion blur in AOVs like direct, diffuse, specular, P, N, and Z when I render to picture viewer.

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