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Expression to maintain linear velocity
I seem to remember there being a simple expression that you can add to a keyframed property similar to loopOut that will extrapolate and maintain a linear velocity based on the velocity and vector of the last keyframe. I can’t find it or figure it out though. Can anyone tell me what it is? It would really help me on this project.
Thanks,
-Matt
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5 Replies
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That’s easy, just take the very last keyframe, then distance = velocity * time. And the exact same code pasted into the rotation will work too.
n = 0;
if (numKeys > 0){
n = nearestKey(time).index;
if (key(n).time > time){
n–;
}
}
if (n == 0){
t = 0;
}else{
t = time – key(n).time;
}if (n > 0){
v = velocityAtTime(key(n).time – thisComp.frameDuration/10);
value + v*t;
}else{
value;
}https://technicolorsoftware.hostzi.com/
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Well, that, or this:
loopOut("continue")Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
RenderBreak Blog – What I’m thinking when my workstation’s thinking
Creative Cow Forum Host: Live & Stage Events -
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loopOut(“continue”) was what I was looking for.
I couldn’t remember it.Thanks both for the helpful replies!
-Matt
Need a quick break from motion graphics?
Try my game Constellation at:
https://www.paperdragongames.com -
I’ll keep Chris’s expression in my back pocket, too — he really knows his stuff, and if he’s concerned about limitations of loopOut(“continue”), it’d be good to have his code around if you run into them.
Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
RenderBreak Blog – What I’m thinking when my workstation’s thinking
Creative Cow Forum Host: Live & Stage Events
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