I am in the process of tyring to model grazing incidence toroids and ellipsoids for xray beam lines. What seems to be causing the most trouble is the sequence of rotations/decenters to achieve ~87 degree AOI on a surface. I have tried both tilting just the individual element, and also decentering a surfurce such that proper AOI is achieved (both using coordinate breaks) but nothing has worked.
Is there something fundamentally different one has to do when dealing with such large AOI angles? Would this task be better achieved in non-sequential mode?
Any advice or help would be greatly appreciated.