How to control motion blur amount when using Transform World?

Question

Hi gang;

Slowly but surely I am getting motion blur to work in my plugin.

I've got it working but it seems to be at a default extreme level. When I compare it to a default layer moved with motion blur, it is much more extreme. Browsing through the SDK I came across this:

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.

I assume shutter_angle and shutter_phase will allow me to control the degree of motion blur. However, there is once again no example anywhere to show how to achieve this or how it works. I took a look at the old CCU example (prior to CS5) but no dice...

Can anyone help me out and give me some tips or examples on how to use shutter_angle and shutter_phase? If that is even what I should be using to control the degree of motion blur?

Thank you,

-Richard

James Whiffin · Accepted Answer

Hi RichardThe amount of motion blur is determined by the difference in the two matrices you used in transform world. If it's based on your params, I use the following code:     // measured as a decimal: 1.0 = 360 degrees or 1024 steps    PF_FpLong shutterPhaseF     = FIX_2_FLOAT(in_data->shutter_phase);    PF_FpLong shutterDurationF  = FIX_2_FLOAT(in_data->shutter_angle);     A_long shutterDurationSteps = shutterDurationF * in_data->local_time_step;    A_long shutterPhaseSteps    = shutterPhaseF * in_data->local_time_step;    A_long previousTimeStep     = in_data->current_time + shutterPhaseSteps;    A_long nextTimeStep         = previousTimeStep + shutterDurationSteps; Checkout the motion blurred params at previousTimeStep and nextTimeStep.

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