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I am doing a render of a tutorial I finished, and when I go compositing it I get a weird jitter on a defocused object. The tutorial had this too (at 1:04:00), but I wonder if it is possible to remove it. I tried adding a blur/defocus node but it ended messing up with the map value.

This is the jitter I'm talking about:

Node setup

And this is my node setup:

Node setup

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    $\begingroup$ Just raise your samples. $\endgroup$
    – GiantCowFilms
    Commented Aug 11, 2014 at 22:46
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    $\begingroup$ Try raising them and see what happens... $\endgroup$
    – GiantCowFilms
    Commented Aug 11, 2014 at 22:56
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    $\begingroup$ Also, are you using render DOF? $\endgroup$
    – GiantCowFilms
    Commented Aug 11, 2014 at 22:56
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    $\begingroup$ Are you using cycles or BI? Could you link to the tutorial in question? $\endgroup$
    – gandalf3
    Commented Aug 12, 2014 at 0:39
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    $\begingroup$ try increasing your F-Stop value $\endgroup$
    – G.Rassovsky
    Commented Aug 12, 2014 at 14:57

1 Answer 1

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It seems the Z always gets only one sample, so it's always noisy around defocused objects regardless of the number of scene samples. However using the mist pass (which was added since that tutorial was made) instead of the Z gives a better result:

enter image description here

To define the distance/thickness of the mist, enable the mist display in the camera settings so that you can see a visualization in the 3D view:

enter image description here

Then adjust the start and depth of the mist in world settings:

enter image description here

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  • $\begingroup$ Yes, this is exactly what I wanted! Thanks a lot! $\endgroup$
    – Gus
    Commented Aug 12, 2014 at 18:03

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