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After Effect Expression – Add selected number to value in a random time
I’m trying to make fake twitch kind of stuff But, stuck in small thing but annoying part..
So, i want to make Random Chat speed.
That mean selected number added in random timeThis is what i come up with
// this expression go separated Y position var t = time var sN = 100 //selectedNumber var value = 0 //you can put existing Y value var talkDesider = Math.round(Math.random()*3); if (Talkdesider == 3){ value = value + sN } else { value }this code will set selectedNumber and Value, TalkDesider
if Talkdesider is 3 value + 100 and store that data to value again
and if Talkdesider isn’t 3 just value will be output
i thought this will work.. but after effect value or var isn’t store data over keyframe… so is there any way to make this..??
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3 Replies
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Expressions have no memory, or any way to pass results from one frame to the next. In this case I think your expression will (on each frame) have to re-calculate, frame-by-frame, everything that has occurred prior to the current time to come up with the correct result for the current frame.
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Yes, that’s what i was learning about expression.. sadly..
so that mean creating a value array form other javascript tool(chrome? or extendscript) and using that array to make keyframe is the only way?
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I guess you could do it with a script, which would create keyframes for your result.
Or you could do it with an expression that creates the result on the fly, as I described. The expression might eventually bog down though, if your comp is long.
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