Updating PCG with BP parameters using the level sequencer

Development Programming & Scripting
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I have an issue with driving PCG with a blueprint actor inside the sequencer. The PCG does not update correctly after animating the parameters in sequencer. Below is a detailed description of my issue.

I created a PCG graph and added it to a blueprint actor as a PCG component so that I could drive my graph parameters with blueprint functions and variables. Everything works as intended: If I change the value of exposed variables in the detail panel of the blueprint actor, my PCG updates instantly as expected, which is demonstrated in the following video.

https://drive.google.com/file/d/1LIZNPEi7t_fg9NqNBxsRVm4OirSā€“Rku/view?usp=drive_link

Then, I tried to do it in the sequencer. in my blueprint actor

  1. I exposed the same variables to cinematics

  2. I checked ā€œcall in editorā€ for all the functions

  3. I set ā€œrun construction script in sequencerā€

in a level sequence,

  1. I added my blueprint actor as a track

  2. I set some key frames for the variables I want to drive

  3. I played the sequence but my PCG was not updating, even though I noticed that the variables of my blueprint actor in the detail pannel updated just fine.

  4. I rendered the sequence with movie render queue, my PCG did not update as well.

Above is demonstrated in the following video:

https://drive.google.com/file/d/1SPPl5cYy0ooa2SklZ2zk4oPcm1cbBGpF/view?usp=drive_link

However, If I click ā€œclean upā€ and then ā€œGenerateā€ PCG after the variables were updated by the sequencer (but not reflected in the viewport), it will update correctly. as shown below.

https://drive.google.com/file/d/1bq5N_6eRS8OWf1ZGQJGj7qPLx1vZWU9A/view?usp=drive_link

So, naturally, I created a new function(Re Generate) in my actor that does exactly that. Then,

  1. I added a trigger to that function before and after the variables were changed by the sequencer.

  2. I set ā€œcall in the editor to trueā€

  3. Nothing happened when I played the sequence

  4. Nothing happened when I rendered

  5. If I manually called the function ā€˜Re Generateā€™ in the detail panel after the variables were changed by the sequencer, it worked.

As shown below

https://drive.google.com/file/d/1gvkBNRAo1eY0UnhDIVBNe7tbWJKm4Qyc/view?usp=drive_link

Also, it appeared that it was not the problem of the trigger because if I added something else in ā€˜ReGenerateā€™, the sequencer would correctly execute that

(in this case, I set a cube to visible)

https://drive.google.com/file/d/1TKSzwgm8AQqPMM1zBSA81GjoHhpH7Qde/view?usp=drive_link

So, somehow, the function triggered by the sequencer was able to execute the last node but missed the first two related to PCG.

I also attempted the following, but nothing worked:

  1. Disable all custom PCG nodes in my PCG graph

  2. Use repeater instead of trigger in sequencer

  3. Use a custom event in BP actor instead of a function, call the event in the sequencer

  4. Add delay to the trigger event

  5. Use quick bind to bind the trigger directly to PCG cleanup and Generate

Iā€™ve been trying to solve this problem for around 7h(in 2 days) with no luck. Any help would be greatly appreciated!

1 Like
2

I am facing the same issue and still not able to figure this issue out.

After the BP variables are updated, I click on the viewport manually and the PCG graph changes are immediately reflected.
But somehow this is not working in an automated way. I even tried to simulate virtual mouse clicks on the viewport - it didnā€™t work as well.

3

@E_icest Check the video link, just working fine. Start from 19 minutes (2) Youā€™ve never seen PCG do THIS! - Animation in Sequencer? - YouTube