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Unfortunately spatially varying refractive index cannot be directly set for the full tensor case, since the full tensor needs to be decomposed to unitary matrix and diagonal tensor. If possible, you may try the LC attribute: https://optics.ansys.com/hc/en-us/articles/360034915153-LC-Rotation-Simulation-object
It has simple rotation relation. If your full tensor can be fit in such definition, it is doable to specify the LC attribute in space. If lucky enough this is the solution.
https://optics.ansys.com/hc/en-us/articles/360043705813-Liquid-crystals-list-of-examples
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