Backport load transform to older UE versions

[moonyuet]

Changelog Description

This PR is to backport load transform to older UE versions(4.27), and the new alembic conversion presets supports in Unreal 5.
https://dev.epicgames.com/documentation/en-us/unreal-engine/python-api/class/AbcConversionPreset?application_version=5.0#unreal.AbcConversionPreset
Also it introduces the custom alembic conversion presets of which user can choose to set it in ayon settings if the transform is still not what they want.

Resolve #179

Additional review information

Please install and build addon with this branch to update the settings
Test it in 5.1 if possible

Testing notes:

1. Try the default alembic presets
2. Load Asset in alembic format (Animation, PointCache, Model, Layout)
3. Switch the alembic presets to custom
4. Load Asset in alembic format (Animation, PointCache, Model, Layout)

[LiborBatek]

Been tested inside UE 5.1 and the basic loading for Alembic and FBX products been working without triggering any errors...

However there is some issue with transforms when loading my enviro asset (which works ok inside Maya and UE 5.5)

here inside maya (note the outer shell and its transforms)

once loaded as Alembic static mesh it got weirdly scaled and rotated (most of its parts):

I have also tried to freeze transforms for the outer shell (as it got some transforms like 100 Scale due to its origin aka been imported from other DCC, however this wasnt an issue in different UE versions)

[LiborBatek]

...freezing transforms didnt produce any correct result while loaded into UE 5.1

note: FBX repre works ok tho

[LiborBatek]

There is still an issue with one of my object once loading the Layout with Alembic set to Maya preset aka default UE addons one.

Now its in correct scale but still rotated 90 deg... no errors in console tho.

[LiborBatek]

No matter how hard I have tried it still produces wrong transforms... I have tried to use custom preset, maya one, also re publish assets from maya but it still been wrong...

There is one weird finding tho...as in UE 5.1 I was not even able to import the Alembic repre of the asset as staticmesh via native import action and it doesnt work too... asset been rotated and scaled weirdly....

Checking in the asset in maya seems fine and without issues... so maybe some kind of UE Prefs interferring with my AYON setup??

Really stuck on it atm, sry.

Any ideas??

[moonyuet]

No matter how hard I have tried it still produces wrong transforms... I have tried to use custom preset, maya one, also re publish assets from maya but it still been wrong...

There is one weird finding tho...as in UE 5.1 I was not even able to import the Alembic repre of the asset as staticmesh via native import action and it doesnt work too... asset been rotated and scaled weirdly....

Checking in the asset in maya seems fine and without issues... so maybe some kind of UE Prefs interferring with my AYON setup??

Really stuck on it atm, sry.

Any ideas??

I try to find some issues of which related to the transforms when importing the Alembic.

I find this quite helpful: https://forums.unrealengine.com/t/alembic-uv/368981

We could try to set -90 degree to rotation X, and then set -1 in z scale. If the scale appears to be smaller we can multiply the scales 100 like we did in OP.

Will investigate more tomorrow

[moonyuet]

I have tested some simple assets in my side, the default custom presets work for my case.
I can load the object with correct transforms.

I updated the PR with that custom preset in maya for 5.1
I am using 5.1.1 for the test
I also find out some loopholes for the json layout loader in maya and unreal of which they are not supporting to load layout for the loaded asset from different library projects. I will create github issue for that later.

[antirotor]

I believe the check should be:

unreal_pipeline.UNREAL_VERSION.minor >= 4):

because the Maya preset doesn't work in 5.3 and custom needs to be used. With this change, import works as expected.

[LiborBatek]

I have tested it in UE 5.1 UE 5.3 and UE 5.5 and all unreal versions works well when loading products and namely layout products.

LGTM