sequencer python scripting limitations

Development Pipeline & Plugins Editor Scripting
1

I’m finding that it’s not possible to add an animation clip to a track in sequencer via python. Has anyone else tried this? I am able to create a level sequence, add a track for a character, add a skeletal mesh animation track, add a section to that track… But not add actual animation to it. Here’s my working code up to that point:

char = ue.EditorLevelLibrary.spawn_actor_from_object(charAsset, [0,0,0])
charTrack = sequence.add_possessable(char)
animTrack = charTrack.add_track(ue.MovieSceneSkeletalAnimationTrack)

Has anyone gotten beyond this with python?

2

You’ll need to add a section on the track and set its range/duration. The section points to the animation asset.

Something like:
animSection = animTrack.add_section()
animSection.set_range(make_range_seconds(0, length))

You’ll need to set the animation asset on the section as well. I can’t remember off the top of my head, but it’s probably something like:

animSection.set_editor_property(“Animation”, yourAnimimationAsset)

Take a look in here for examples: Engine\Plugins\MovieScene\SequencerScripting\Content\Python

3

These examples are fantastic! Thanks, I didn’t realize there were examples hidden in the engine folder. Will dig into this.

4

i have a problem , how can i use python sequencer

5

I’m finding that it’s not possible from Python to add sequencer tracks for camera properties (like focal length) or particle systems toggle tracks. Has anyone found a way to do either?

6

I have same problem，add sequencer tracks for particle systems toggle tracks，did you find a way to do this？

7

I was able to add a particle systems toggle track, but not add keys to it. Adding the track is much the same as adding other tracks.

8

Hi guys,

tried to use the API this week and couldn’t make it work. I tried some of the examples in “Engine\Plugins\MovieScene\SequencerScripting\Content\Python” and not sure they are working.

When I create a LevelSequence and list the attributes using the dir() function, I don’t see any of the functions listed in the API doc.

I looked at the LevelSequence.h file and looks like the functions are maybe missing decorators if I compare to EditorLevelLibrary.h where the functions have a UFUNCTION(BlueprintCallable, Category = “Editor Scripting | Level Utility”) decorator.

I tried to add the decorator to the LevelSequence::GetMovieScene() function and then to recompile the code and I was able to see it in the LevelSequence attributes.

Looks like we are still missing some stuff to play with LevelSequences using python.

9

Did you enable the SequencerScripting plugin?

10

There’s a youtube channel by Alex Quevillon with tutorials on how to do this. I basically copied his scripts and they seem to work. (if you’re pasting this, double check for typos and indents)

def addAnimTrackOnPossessable(animPath, possessable):
animAsset = unreal.AminSequence.cast(unreal.load_asset(animPath))
params = unreal.MovieSceneSkeletalAnimationParams()
params.set_editor_property(‘Animation’,animAsset)
animTrack = possessable.add_track(track_type = unreal.MovieSceneSkeletalAnimationTrack)
animSection = animTrack.add_section()
animSection.setEditorPropery(‘Params’, params)
animSection.setRange(0,animAssetLength(animPath)