Motion Blur

Effects handle their own motion blur, using PF_InData>shutter_angle along with PF_InData>shutter_phase.

The plug-in must set PF_OutFlag_I_USE_SHUTTER_ANGLE so After Effects knows it needs this information.

They must check out their own parameters at other times to examine their change over the shutter interval.

If the plug-in checks out parameters outside this interval, set PF_OutFlag_WIDE_TIME_INPUT.

Doing so allows After Effects to compare the parameters within the sampling interval, and determine if they’ve changed.