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

1. Turn on Enable in the Bifrost Meshing attribute group of the liquid or aero shape. For more information, see Work with Bifröst Meshes and bifrostShape attributes.

2. Select the bifrostMesh object and export it 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: 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.