README.md

Unreal Alembic Batch Importer Plugin

An alembic batch importer plugin in Unreal Engine 5.2 with Houdini space transform option.
Using this plugin you can easily import multiple alembic simulations as geocache from Houdini without checking settings everytime.

Install

• Install required packages:
  • option 1：pip install the Python dependencies to ...\Your-Unreal-Project\Content\Python\Lib\site-packages (you can use --target with pip install)
    • PySide2
    • unreal-qt
  • option 2 (recommended)：Copy the pre-download library (Python folder) to your Unreal project's Content folder ...\Your-Unreal-Project\Content\Python
• Copy the folder to your Unreal project's plugin folder ...\Your-Unreal-Project\Plugins\alembicBatchImporter
• Restart Unreal and Enable the plugin

Prerequisites

• In Unreal Editor, open Edit - Plugins window, enable Alembic Importer plugin
• Add ...\Your-Unreal-Project\Content\Python\Lib\site-packages to your editor python path, see Unreal doc

How to use?

• When the plugin enabled, a button will add to editor tool bar, press the button, and a window like this will show up.
  
  
• Import Destination: Type in your alembic geocache import destination, eg: /Game/ABC.
• Transform from Houdini Space?: Choose your import transform space, by default it sets to from Houdini space to Unreal space: scale=unreal.Vector(100, -100, 100), rotation=unreal.Vector(90, 0.0, 0.0).
• Select Files: Choose your .abc file folder from the computer.
• Import All Alembics: Import all at once!!

Tips

• I used this script to change all geocaches' material

    def returnMaterialInformationSMC():

    levelActors = unreal.EditorActorSubsystem().get_all_level_actors()
    testMat = unreal.EditorAssetLibrary.find_asset_data('/Game/StarterContent/Materials/M_AssetPlatform.M_AssetPlatform').get_asset() # replace your material path

    for levelActor in levelActors:
        if (levelActor.get_class().get_name()) == 'GeometryCacheActor':
            geometryCacheComponent = levelActor.geometry_cache_component

            print(levelActor.get_name())
            materials = geometryCacheComponent.get_materials()
            for material in materials:
                print(material.get_name())
                try:
                    for item in material.texture_parameter_values: print(item)
                except:
                    pass
                print('_')

            for i in range(geometryCacheComponent.get_num_materials()):
                geometryCacheComponent.set_material(i, testMat)

    returnMaterialInformationSMC()