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I want to render my scene in Blender with Motion Blur enabled, but I don't know whether I'm able to render the whole scene in one rush, for it'll last quite long.

Question: When I start rendering at frame 1 and stop rendering at frame 10, when I start rendering frame 10/11 again will the motion blur look the same or does the interruption cause a change in the blur look of the restarted rendering?

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  • $\begingroup$ There should be no issues as long as you don't change any of the settings for motion blur in between renders. $\endgroup$ – cegaton Dec 11 '17 at 16:43
  • $\begingroup$ Cegaton's comment is close to an answer. What renderer are you using? They handle motion blur differently, this should be included in the coming answer. $\endgroup$ – Leander Dec 11 '17 at 18:57
  • $\begingroup$ @Leander I'm sorry, I forget almost everytime to tell you I'm using Cycles (for I forget the Internal renderer quite easily). $\endgroup$ – NGCHunter2 Dec 11 '17 at 21:41
  • $\begingroup$ Note that you can easily 'fake' motion blur using vector blur and the speed pass in compositing, which is much, much faster but can cause slight visual artifacts. The speed-quality tradeoff is in favor of vector blur for animations, but traditional motion blur for still images. $\endgroup$ – HENDRIX Dec 11 '17 at 21:46
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From what I have observed, when motion blur is enabled and Cycles is the renderer, Blender steps back a frame to compute the motion difference between the frame being rendered and the frame that came before - you can see this happening in the info line at the top of the UV/Image Editor when rendering is underway - so long as you leave all settings unchanged Blender should deliver consistent motion blur over whatever frame range you set - alternatively you can add a one-frame "head" and "tail" to your frame range to make sure you definitely get all frames properly rendered across the breaks in your sequence

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