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S
shmiths
Known Participant
July 4, 2024
Question

Expressions for animating text without keyframing (inPoint endPoint?)

  • July 4, 2024
  • 2 replies
  • 730 views

Hi all

 

BIt of a novice on expressions

I have a lot of text I need to animate, what i'd like is an expression which uses the inPoint and endPoint of the layer to play the text Animator and animate the words in and out.

 

Mainly so that I dont have to adjust the distance between keyframes depending how many words are in that text layer, meaning the speed of the animations are consistent/standardised.

 

e.g A text layer with 1 word will take 0.1 seconds to transition, 5 words will take 0.5 seconds, and a layer with 10 words take 1 second.

I'm currently using this bounce expression on an Expression Selector in the Animator-

delay = .00;
 myDelay = delay*textIndex;
 t = (time - inPoint) - myDelay;
 if (t >= 0)
	{ 
	freq =0.0;
	 amplitude = 250;
	 decay = 10;
	 s = amplitude*Math.cos(freq*t*2*Math.PI)/Math.exp(decay*t);
	 [s,s]
	 }
	else
	{
	 value
	 }

this basically does what I'm after (though has unnecessary bounce code in there as dont know how to remove), but I'm struggling to work out how to do this for the transition out.

 

Thanks for any help!

This topic has been closed for replies.

2 replies

Dan Ebberts
Community Expert
Dan EbbertsCommunity Expert
Community Expert
July 4, 2024

I think if you make sure you delete the Range Selector and set the Scale Animator value to 0, then you should be able to use an Amount expression like this for the Expression Selector:

fadeDur = .7;
fadeIn = linear(time,inPoint,inPoint+fadeDur,100,0);
fadeOut = linear(time,outPoint-fadeDur,outPoint,0,100);
Math.max(fadeIn,fadeOut)

 

S
shmithsAuthor
Known Participant
July 4, 2024

Thanks, It's position/opacity i'm trying to animate (so the words move down and fade)
On position, it almost does the job but it moves the entire line (the animator is set to wrods) and doesnt stagger them.
On scale, it scales the individual word but also with no stagger/delay.

Appreciate the help!

Dan Ebberts
Community Expert
Dan EbbertsCommunity Expert
Community Expert
July 4, 2024

Ah, OK. I saw you had the delay set to .00 so I figured you weren't using it. Try it this way:

fadeDur = .7;
delay = .1;
t = time - (textIndex-1)*delay
fadeIn = linear(t,inPoint,inPoint+fadeDur,100,0);
fadeOut = linear(t,outPoint-fadeDur-textTotal*delay,outPoint-fadeDur,0,100);
Math.max(fadeIn,fadeOut)
    Mylenium
    Mylenium
    Legend
    July 4, 2024

    My brain is a bit fried at the moment, but something liek this should work (untested):

    mSpeed=0.1;
mDur=mSpeed*textTotal;
mStart=time-inPoint;
mEnd=outPoint-time;

if (time => inPoint && time <= inPoint+mDur)
{mStart*mSpeed*textIndex};
else if (time <= outPoint && time >= outPoint-mDur)
{mEnd*mSpeed*(textTotal-textIndex)};
else
{value};

    Mylenium

    S
    shmithsAuthor
    Known Participant
    July 4, 2024

    Thanks, this gives me an error-

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