Decoding After Effects Motion Blur

Decoding After Effects Motion Blur

The Advanced tab of Composition Settings (Ctrl/
Command+K) contains Motion Blur settings.
. Shutter Angle controls shutter speed, and thus the
amount of blur.


. Shutter Phase determines at what point the shutter
opens.
. Samples Per Frame applies only to 3D motion blur; it
sets the number of slices in time (samples), and thus,
smoothness.
. Adaptive Sample Limit applies only to 2D motion
blur, which automatically uses as many samples as are
needed up to this limit (Figure 2.15).
Here’s a bit of a gotcha: the default settings that you see in
this panel are simply whatever was set the last time it was
adjusted (unless never, in which case there are defaults).
It’s theoretically great to reuse settings that work across
several projects, but I’ve seen artists faked out by vestigial
extreme settings like 2 Samples Per Frame or a 720 degree
blur that may have matched perfectly in some unique case.