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Alembic export with attributes on packed prims? Dec. 13, 2019, 5:36 p.m.

But as soon I unpack, edit and transfer the “abc_UserProperties” back and pack it again, the abc_userProperties don't get exported correctly.

Both “abc_userProperties” and “abc_userPropertiesMetadata” are needed.

Ways to get geometry info inside a Packed Alembic... Nov. 19, 2019, 12:49 p.m.

Do we need to unpack+convert a Packed Alembic to know how many Points & Polygons are inside a Packed Alembic?

Packed Alembic primitives have an intrinsic called “abcpointcount” that will tell you the number of points.

alembic layering in houdini 17.5 Oct. 17, 2019, 6:36 p.m.

That software appears to operate the same way: It looks like they are generating a static base, a deformation layer (that only hold new point positions and normals), and a texture layer (only containing texture coordinates). You also import the scene with the layers applied by simply providing a list of file paths.

Attached is a similar example. You don't need access to the original Alembic exporter to create a layer. In this example, we import an Alembic archive and build new layers for it.