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Note that when using Bifrost Graph Volumes, to export ass and kick you need to not expand procedurals.  In MtoA, this means in the .ass export options Expand Procedurals should be disabled.

User Data Support

Arnold-Bifrost will attempt to translate every Bifrost property to Arnold.  For built-in properties that correspond to a known Arnold built-in parameter, they will be translated as such and not as user data; however, all other properties encountered will be translated as user data so that they are made available to shaders and operators to use as they see fit.


The type and scope of user data in Arnold depends on the type of object being rendered, e.g. points only support constant and uniform user data, while polymesh supports constant, uniform, varying and indexed user data.  The following table shows which scopes are supported for which object types, and which types are supported overall: