Berens, M.M.BerensVöll, A.A.VöllWester, R.R.WesterStollenwerk, J.J.StollenwerkLoosen, P.P.Loosen2022-03-132022-03-132018https://publica.fraunhofer.de/handle/publica/40149310.1117/12.2313487further shape or diffuse the light distribution (e.g. in non-imaging luminaires or automotive headlights). While the geometry can be described in a parametric form by mapping the micro-optical features onto an underlying smooth freeform surface, ray-tracing an optical system composed of NURBS or polynomial B-spline surfaces for each optimization step can be costly.en621conference paper