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I have a nice (in my opinion :) ) looking propeller on my Fokker VII. I am happy with this for stationary shots, but if I want to composite this in an aerial scene, I obviously shouldn't have the propeller still.

propeller

How would you render this propeller in a way that it looks like it is spinning very fast? What are the tricks, do you blur it or something?

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I think you mean the motion blur effect.

In Cycles render engine, you can first animate the propeller with a very fast rotation, and toggle Motion Blur in Render tab, then set a appropriate Shutter time:

enter image description here

For Blender Internal render engine, there is also a Sampled Motion Blur panel in the Render tab:

enter image description here

For compositing, you can enable Vector pass in Render Layers tab, and use Vector Blur node to make use of it. Example:

enter image description here

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  • $\begingroup$ Is this 3d motion blur or a hack in from the compositor? $\endgroup$
    – Vader
    Commented Mar 8, 2014 at 12:59
  • $\begingroup$ @Vader - no, though you can do that too if you want (using a vector pass) $\endgroup$
    – ideasman42
    Commented Mar 8, 2014 at 13:01
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    $\begingroup$ why do we need Z for the vector pass? $\endgroup$
    – Vader
    Commented Mar 8, 2014 at 13:24
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    $\begingroup$ It needs Z pass to determine by how far the moving pixel can be against the camera. For example, you can imagine a car shuttling right in front of your face, and a train running 1km far from you. Even they got same speed, I'm sure you can tell which one should be blurred more. :) $\endgroup$
    – Leon Cheung
    Commented Mar 8, 2014 at 13:48
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    $\begingroup$ However, that Vector blur method sometimes got unwanted results, e.g. in this case, you can see the difference from the first two ways. $\endgroup$
    – Leon Cheung
    Commented Mar 8, 2014 at 14:26

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