Ive performed a FE analysis on a microscale RVE and determined the elastoplastic behaviour with Hills yield criterium 
I want to assign that material law in CalculiX for FE simulation on a macroscale level. From what Ive read so far a umat subroutine has to be defined in order to do that.
In Abaqus the Hill Yield is already implemented and can be used for that.
My question is if someone can give me a suggestion or hint if it is possible to define anisotropic plasticity without creating a umat subroutine?