Opacity Expression Trick for Comet Star Effects
Автор: Brent Mantooth
Загружено: 2020-11-26
Просмотров: 3859
Описание:
After watching a lot of how to videos on youtube, I though I would try to give back a little and share something I was playing with - and hadn't seen other people do.
I used Adobe After effects to combine a jpg sequence of star trails and using expressions was able to make comets using a custom slider.
Concept is to control the opacity of each layer in the comp as a function of its inPoint
Variables:
thisComp.frameDuration -- time duration for each frame
inPoint - time (on the comp timeline) when this layer becomes visible
outPoint - time (on the comp timeline) when this layer has ended
time - for the comp timeline
tframes = thisComp.layer("Variables").effect("DelayTime (frames)")("Slider")
tSecs = tframes / (1/thisComp.frameDuration)
linear(time,inPoint, inPoint + tSecs, 100, 0)
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