Seq data/Arb data/Undo issues

Question

Hey All!Can solve that situation, maybe I miss something!?Working on effect, me scheme: param1 -\                                 / renderparam2 ---} [sequence data] -param3 -/                                 \ update custom UI So if any param is changed, seq data recalculating and both, render and custom UI - updating.If I undo last param changes, param will undo, render will take a previous image from cache, but sequnce data will not update, its undoeble.For example:1step. param = 1, seq data = 255, render/UI - white2step. param = 0, seq data = 0, render/UI - black3step. UNDO -> param = 1, seq data = 0, render - white(from cache), cust UI - Undefined Behaviour. I cant find the point, where I can recalculate my seq data if Undo and draw updated custom UI. Do we have any Event, or flag or function to manage that? What I tried:1. Trying to find undo event. ctr-z KEYDOWN works fine, but as I see in Debug, key-down was the first event after ctr-z command, and the value of slider is still not reverted. So I cant use that values,2. I can recalculate seq data in Draw event, but its wrong way. I cant send it to render and I need to recalculate it many/many/many times at every Draw event.3. cant use PF_Cmd_UPDATE_PARAMS_UI4. Im wondering, should I use arb data for my custom UI? And what the role of seq data then? What is ncice way to work with undo in AE if I have custom data?here is an order of called events after ctr-z:Many seq calss, I have all of them (accordingly with that doc:https://reduxfx.com/ae_seqdata), but its not working for me.

shachar carmi · Accepted Answer

Hey Shachar!Thank you for clarification!Yes, I thought about it, that I shouldt use seq data a base for calculations. But was not sure, what is the place for that data in my effect (architecturally).Now I need to save my important data into arb data and connect it with my custom UI. Assume that data should be undoable.Seems like seq data is a temporary place to pass some information to another modules. From event calculations to render, for example. Or to some functions which dont have an access to params, where I cant have an access to my arbdata, right? well... there's no declared purpose for it.it's not much good for processed image data, becuase different frames might get processed at the same time.it's no good param-dependet processed data, as there's no telling when the param values changed. i personally use it for a couple of things:1. sequence setup is a unique call for brand new instnace. i use it to flag new instances for some purposes.2. sequence data survives the user hitting the "reset" button. i use it to store data that won't survive in an arb in that situation.3. sequence data doesn't undo/redo, so i store stuff there that i don't want changing, or that just doesn't trigger a re-render or an undo entry when changed.4. for data that i need kept during a session but i don't want bloating the project file. in other words, i use it only when other storage methods don't meet the needs. otherwise it's kinf of a paint in the butt...

babichfx · Answer

Maybe problem in my seq flattening functions..If it helps:

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