Speed distance tune-up to the brightness filter expression

Hi I would like to create an expression that connects the rate at which the focal length of the camera shifts to a brightness filter.

Thus, for example, if the focal length changes suddenly and quickly, I want an image to get proportional to how fast the focal length changed brighter suddenly. Conversely, if the speed at which the focal length changes is slow, there should be very little change in brightness of the image.

Better yet, if you could tell me how to make the changes in brightness lag by about one second after the distance of development changes took place, that would be great!

Thank you very much!

I forgot to negative speed. This should fix this problem:

atten = 20;

delay =. 5;

C = thisComp.layer ("camera 1");

Math.ABS (C.cameraOption.focusDistance.speedAtTime (Time-delay)) / wait

Your second question requires a more complicated expression. The expression would be a backward loop, frame-by-frame to determine how long the latest transition in the focal distance is produced or use this time to lead a kind of pulse for the brightness in decomposition. Sounds like fun - I would like to have time to get out to you.

Dan

Tags: After Effects

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