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Motion Blur Q's


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#1 Kamikaze

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Posted 17 April 2013 - 05:13 PM

I have a scene with several motions ,sea ,ship rocking etc. when I apply MB will it effect those motions or only fast motions I specifically what MB applied to, some motions I have are not slow but I do not want MB on those.
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#2 robcat2075

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Posted 17 April 2013 - 05:43 PM

Motion blur is image-wide. Faster moving things will exhibit more of it. The non-multi-pass version of motion blur has some sort of a threshold of motion, below which it doesn't bother to add any.

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#3 Rodney

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Posted 17 April 2013 - 11:35 PM

Here's a trick that worked for me... (However, please note I haven't thoroughly tested it out) For some reason A:M's motion blur tends to perform better blurring when dealing with imagery rather than geometry. What this requires then is for you to render the scene out without blur and then... ...bring that rendered sequence back into A:M as a Roto or patch image and then render again with Multipass and motion blur on. I use to have some examples laying around but they are long buried. However, it's pretty straightforward to test this out by rendering some simple geometry. A classic setup for this might be to have three objects (balls or cylinders) that start and stop at the same locations but animating their breakdowns positions (anticipation and slow in/slow) out differently which results in different motions for each playing out. When re-rendered with Motion Blur the faster movement should have more and more effective motion blur. To maximize motion blur effects it might pay to render out still objects in one pass and then composite the moving objects over that. The still objects wouldn't need to be re-rendered and blurred which would save over all rendering time and allow further (manual) manipulation of the blur effect.
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#4 thefreshestever

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Posted 18 April 2013 - 12:06 PM

if you really want to have some fast moving objects without motion blur, and some slower moving objecs with motion blur (not sure why you´d want that), i´d suggest to render without mb and do the blur in post. you could render out those objects seperately with an alpha channel and then composite the whole thing in after effcts for instance and just apply motion blur (and control the intensity) to the layers you want. good mb plug-in for after effects is reelsmart motion blur.

#5 Kamikaze

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Posted 18 April 2013 - 12:17 PM

Thanks Men, Think I'll try your trick Rodney if the current render looks funky to my eyes........nice idea too! Oh, I may have not been clear..I want a fast moving object in the scene to have MB ,but with test MB renders I seem? to get MB on my ocean movement which is moderate movement/motion..... Also rendering out separately is a good idea too, but never got comfortable with multi renders and compositing......that is, yet Thanks Mike C
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#6 Rodney

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Posted 18 April 2013 - 01:31 PM

Also rendering out separately is a good idea too, but never got comfortable with multi renders and compositing......that is, yet


Yes perhaps... but I seem to recall that you put together what is now consider THE CLASSIC tutorial on using Layers with A:M.
At least to a newbie like me it was inspirational. :)
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#7 Kamikaze

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Posted 18 April 2013 - 02:16 PM

Rodney, I doubt that was me ...... maybe another Mike? I did some live action stuff, animation and stills ..... not sure about tutorials.......
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