overshoot expression bug

[Dan Ebberts]

>the expression is from motion script site

Not exactly.

One thing I notice is that you have the frequency tied to a slider. Is the slider animated at all? That could cause problems.

[boaz halperin]

thanks dan

well no not animated just made it for convenience i dont need to animate it since the expression makes all the charm, i dont think the issue is the expression itself since there are times it do work like if i open a new project it works, so this is an odd bug

[boaz halperin]

one thing i forgot is that its ae 2023 since i encountered many issues in the new 2024 ae

[boaz halperin]

and if i have the chance to talk with dear dan- anotrher question- how can tweak this same expression in order to make it and out transition meaning instead of creating a decreasing sine wave just make an increasing one- but first offcourse is to make it work without bugs

[boaz halperin]

now i experimented it in a new project and wham it works

decay is 7

delay is 60

speed is 2

so how come in a full project it wond render? odd isnt it sherlock?

[Yoan Boisjoli]

Hi Boaz, is it possible that the expression engine wasn’t set to JavaScript in the project settings?

[boaz halperin]

thanks yoan!

well i checked that allso but not it was on javascript and i tried to change it to legacy but with no change, so i changed it back to java

this bug is really obscure cuz when i change the font it suddenly renders, i can manage with it, but mayb someone has a clue where can this bug come from is it a lack of ram? i dedicated ae 29 ram out of 32. mayb the project is too heavy? i dont understand it and i want to have a normal way to work with ae and not get into the house only through the window… so if someone has an idea, that will be lovely

[Yoan Boisjoli]

The issue might be related to how After Effects is handling memory and cache. Given that clearing the cache temporarily fixes the issue, here are a few steps that could help you troubleshoot the problem:

1. Cache & memory Issues: Since you’ve already mentioned clearing the cache helps, try adjusting the cache settings in After Effects. You could increase the disk cache size or change its location to a faster drive. Also, close any other unecessary programs while working in AE to free up RAM.

2. Text Rendering & Font Issues: The fact that changing the font makes it render suggests it might be an issue with how AE is rendering text. Try converting the text layer into shapes or pre-composing the text animation to see if it stabilizes the rendering.

3. <strong style=”font-family: inherit; font-size: inherit; color: var(–bb-body-text-color); background-color: var(–bb-content-background-color);”>Slider Values: You’re using a slider to control frequency, decay, and delay. Sometimes sliders can cause unexpected behavior, especially when they’re set to extreme values or rounding errors occur. Try clamping the slider values within a reasonable range to see if that helps here’s an example: clamp(effect(“Speed”)(“Slider”), 0, 10)

4. Out Transition: To modify the expression for an increasing sine wave (rather than a decreasing one), you can reverse the amplitude by multiplying amp by -1 in the overshoot calculation. You could adjust this section of the expression:

amp = (endVal - startVal)/dur;
endVal - amp*(Math.sin((t-dur)*w)/Math.exp(decay*(t-dur))/w);