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Motion blur and AOVs

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Message 1 of 5
paul.clements
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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?

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4 REPLIES 4
Message 2 of 5

Hi

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



// Stephen Blair
// Arnold Renderer Support
Message 3 of 5

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?

Message 4 of 5

Check out this thread:

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

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

Message 5 of 5

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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