First post. Could use some expression tips.

[Mike Sevigny]

I think the wiggle() expression is what you’re looking for.

Expressions can be overwhelming at first but it’s worth it the moment you can wheeled their power
Spend some time on Dan Ebberts’ website (https://www.motionscript.com/) and check out some of the COW expression video tutorials.
The pros on this forum are quick to help, post your questions as you go.

Mike Sevigny
https://www.torusmedialabs.com

[Randy Davis]

Thanks for the link to Dan’s site, I’ll be sure to check it out. Wiggle will not work in it’s pure form as I would like the opacity to change slowly, over a couple of seconds even. Think of a ghostly image slowing fading in and out of view.

[Walter Soyka]

[Randy Davis] “Wiggle will not work in it’s pure form as I would like the opacity to change slowly, over a couple of seconds even. Think of a ghostly image slowing fading in and out of view.”

You can wiggle() slowly.

Wiggle takes a few parameters (called “arguments” in Javascript); the first is frequency, or number of wiggles per second. Setting this to a fractional value gives you a very slow wiggle.

Walter Soyka
Designer & Mad Scientist at Keen Live [link]
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
@keenlive   |   RenderBreak [blog]   |   Profile [LinkedIn]

[Randy Davis]

So I assign a random variable, maybe controlled by a slider, in the first line giving a fractional value, and then use that variable in the wiggle expression on the second line. Thank you.