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Getting plot data

Is there a way to extract the set of values used in a plot using sage/python code?

For example, if I have 3D surface plot, what is the best way to get the set of vertices, or the z-values, for the mesh? (and similarly for 2d plots) I've looked through some of the plotting source code but haven't found a straightforward way to access the underlying plot data.

Any tips would be appreciated!