This article provides an overview of the Grid Sag surface and shows how to implement it in a sequential system.

Authored By Alexandra Culler & Erin Elliott

Introduction
Grid Sag surfaces can be used to model virtually any surface shape in Sequential Mode in OpticStudio. Each Grid Sag surface is defined by providing an array of sag values at a uniform grid of (X, Y) points across the surface. The Grid Sag format is particularly useful for modeling freeform surfaces, which may lack symmetry or an analytic expression to describe the surface.  

support.zemax.com/hc/en-us/articles/1500005490241-How-to-use-the-Grid-Sag-surface-type
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