Groom exporter

Export from Blender the new Curves object type to Alembic, the export file will use the Groom schema specified by Unreal Engine, updated with new attribute parameters used on UE 5.1.

The new Curves object and Geometry nodes give the power to make new Hairs for UE faster and with incredible results.

Supports Blender 4.1 version.
The Addon requires the installation of the PyAlembic library as a dependency; included to download, the library will be installed only in the addon folder.
(The included library is compiled for the Python version used on Blender and Windows OS; another precompiled version can be downloaded from here ).

Supports:

• The exported curves have a transformation corrected for UE automatically, the scale is given on the export settings.
• Export of multiple objects together, UE detects as separate groups and can be applied different settings on everyone.
• Groom_ (tool, major_version, minor_version, group_id, name). Assets Properties are given to the export file from the Curve object asset and blender.
• Groom_ (color, roughness, widths, and root_uv).

Specialized cases, not tested.

• Groom_properties; (Looks like a system to save metadata from the asset creation tool. (On a series of UE code reviews don't look like it's used)).
• Groom_ (knots and orders); are controls of the curves(needs more research from my side).
• Groom_ (guide, id, closest_guide, and weights_guides); are used to give the interpolation settings to UE. (If the settings are not given, UE automatically calculates it).

Don't Support Animation.

The purpose of the addon is to know the Groom schema and how it works.