I have finished the first draft of some structured grid operators, using MATLAB. The idea is to create a very simple, minimalist set of functions that can be used to work with structured grids. For example, there are tools to average grid points to reduce the size of a matrix to match anther (like you need to do to get velocity on rho-points). There is a very general tool for extracting isosurfaces. There are a few bonus tools for working with the s-coordinate used in roms.
Take a look.
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