Scale over time expression

Question

I'm trying to have an element scale up and do so through an expression:

startScale = 100;

endScale = 300;

scaleUpTime = 5;

s = ease(time, inPoint, inPoint + scaleUpTime, startScale, endScale);

[s,s]

This works but I'd like to modify this is that the endScale is actually a random number between 100 and 300.

I'd also like the whole thing to trigger at a specific time (or frame).

I tried random(100,300) but it gives a jittery result not a constant scale up to a random value

Dan Ebberts · Accepted Answer

Thank you Dan,Is there a way to express the fStart in seconds from beginning of comp rather than in frames?So the in point is no longer part of the equation? I guess that would be like this:scaleUpTime = 5;tStart = 2; // start at 2 sec from beginning of compstartScale = 100;seedRandom(index,true)endScale = random(100,300);s = ease(time, tStart, tStart + scaleUpTime, startScale, endScale);[s,s] Dan

ctroyo7 · Answer

So the script that was mentioned above worked perfect for me. However, how do I separate the x & y. I only want the 'Y' axis to scale up with time and I want 'X' to stay the same thickness the entire time. Allowing me to build a bar graph.

The script that worked for me was:

startScale = 0;

endScale = effect("Bar 6 Height")("Slider");

scaleUpTime = 4;

s = ease(time, inPoint, inPoint + scaleUpTime, startScale, endScale);

[s,s]

But how can I keep the x from scaling? I just want to keep it the same size.

Thanks

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