Returns a tuple with x and y coordinates of a flat surface
surface: Surface :
flat surface
x: np.ndarray :
x coordinates
y: np.ndarray :
y coordinates
Notes
If the surface is not flat (any z coordinate is non-zero), an exception is raised.
mvpa2.misc.plot.flat_surf.flat_surface2grid_mask
mvpa2.misc.plot.flat_surf.flat_surface_curvature2rgba
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