Cache Bifröst meshes as Alembic files

You can export and import Bifröst meshes as Alembic files to transfer them between scenes or use them with other applications.

Export a Bifröst mesh as an Alembic file

You can export a bifrostMesh object as an Alembic file in the same way as any other mesh. See Create Alembic cache files .

To export channels like velocity as color sets, make sure that Write Color Sets is selected in the Advanced Options section of the Alembic Export window. The exported channels are:

• bifrostVelocity
• bifrostVorticity (liquid only)
• bifrostCurvature (liquid only, if enabled in the main property's Optional Channels attribute group)
• bifrostChurn (liquid only, if enabled in the main property's Optional Channels attribute group)

Note that the velocity color set values are in units per second — if you use a custom shading network then you might need to convert the values to units per frame.

Import a Bifröst mesh from an Alembic file

You can import a Bifröst mesh in the same way as any other Alembic file. See Import Alembic cache files.

For motion blur, make sure that:

• Motion Vector Color Set is set to bifrostVelocity in the Mesh Controls attribute group of the shape node.
• Depending on your renderer, make sure that it is set up to use vertex color sets.
• Make sure that motion blur is enabled for your renderer.