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Motion blurring a stroke – or replacing the stroke entirely
I’m trying to get a handle on animating a rotating object that is followed by a tail as it speeds up and slows down. So far I have created the tail by making a new adjustment layer, adding Generate Stroke to the layer and then rotating the adjustment layer at the same speed as the object (by parenting both the object and the adjustment layer to a null that is rotating at various speeds). The Stroke grows from 0 to ~25% of a circle and then stops growing, and the point that the Stroke grows from is synced up to where the object is. This works decently for the effect of having a tail grow from the object as it rotates and then stop growing and simply follow the object as it speeds up or slows down (but it might not be the best method).
The problem comes when I want to motion blur this. Just ticking Motion Blur on the object layer works fine; it blurs nicely as it speeds up. Ticking motion blur on the adjustment layer with the Stroke does nothing – apparently Stroke is applied after motion blur, if I’ve understood it correctly? If I add CC Motion Blur the layer stops rotating entirely and is just a still image of the Stroke effect. If I add Pixel Motion Blur the layer becomes invisible.
Are there any smart ways I can add motion blur to my Stroke layer, or alternately find another way to generate the ‘tail’ of the orbiting object? I don’t have a plugins or the like at my disposal, unfortunately.
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1 Reply
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Can you precompose your entire animation and then use Pixel Motion Blur on the precomp?
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