Add Spawnables to Sequence in 5.6

danwhalan
Mon, 22 Sep 2025 02:01:17 +0000
Editor Scripting

With Add Spawnable from Class/Object from MovieSceneSequenceExtensions being deprecated in 5.6 in favour of the LevelSequenceEditorSubsystem version, there is no longer the ability to add spawnables to sequences that aren’t currently opened. This is a big issue for me as I need to be able to generate sequences and add spawnable bindings to unopened sequences as part of our mocap pipeline.

Currently I have explored spawning actors, adding them as posessables and converting them to spawnables after the fact. Spawning and adding posessables works fine and doesn’t require the sequence to be open. However converting to spawnable (using the LevelSequencEditorSubsystem) will have no effect if the sequence isn’t open.

When executing the funciton it throws the error “LogLevelSequenceEditor: Error: AddSpawnableFromClass requires that the requested sequence LS_dev01_AA be open in the editor”. Obviously this is by design and I am curious if there are any plans or workarounds to enable adding spawnables to unopened sequences?

4 posts - 3 participants