I have an image that I want to scroll vertically in a comp. I also want it to 'loop' topp-and-bottom so I figured applying Motion Tile and moving the vertical amount of the 'center' parameter would do the trick. Instead of keyframing it, I would like to somehow apply the 'time*' expression to it, find a speed I like and then 'set it & forget it.'
Obviously, 'time' doesn't work on that parameter as it has an X and Y axis. Is there any way to accomplish what I'm attempting? I know keyframing it would take about 3 minutes to find the speed I like, but I enjoy the challenge of finding solutions to these problems.
Any help anyone can offer is greatly appreciated. Thanks!
This expression might be what you're looking for: [value, time * 50]
Like you said, because the Center property requires an X and a Y parameter, values need to be provided for both-- so the above expression feeds "value" into the X parameter and "time *50" into the Y. value is the value of whatever you've keyframed the X parameter to be, so you can have "time *50" control the Y parameter and you can still keyframe the X value if you'd like.
These can be changed to whatever you want.
Hope that helps!