I want to make an implicit 3D plot of the surface of one coordinate having constant value in orthogonal, curvilinear coordinate systems, along with decorations on that surface of what the unit vectors look like at sample points. Is there any easy way to iterate over sample points of the surface, so that I may generate graphics objects describing the unit vectors at those points? And are there any hooks into the implicit_plot3d function that allow me to place those graphics objects at the appropriate locations?
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