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Recording and (computational) processing of complex wave fields offers a vastrealm of new optical methods. Also for optical 3D-metrology. We discussfundamental similarities and differences of holographic surface topographymeasurement versus non-holographic principles, such as triangulation, classicalinterferometry, rough surface interferometry and slope measuring methods. Keyfeatures are the physical origin of the ultimate precision limit and how thetopographic information is encoded and decoded. We demonstrate that thequestion "is holography just interferometry?" has different answers, dependingon how we exploit holograms or interferograms for metrology. The answers willhelp users to find out if their measurement results could be improved or ifthey already hit the ultimate limit of what physics allows.

Reflections about holographic and non-holographic acquisition of surface topography