generate_plot_points for multiple variable functions and contour_plot

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Is there a default sage function to generate all (x,y,f(x,y)) values the program uses to draw a multivariable function or the contours of let's say a f(x,y)=C ? I am new to sage and could only find that generate_plot_points works only for one variable functions.

Example from documentation:

sage: from sage.plot.plot import generate_plot_points
sage: generate_plot_points(sin, (0, pi), plot_points=2, adaptive_recursion=0)

I guess one could solve symbolically let's say a contour equation and then create the values i talk about like discussed here:

sage: var('x,y')
(x, y)
sage: solve(y^2 - x^3 - x == 0, [y])
[y == -sqrt(x)*sqrt(x^2 + 1), y == sqrt(x)*sqrt(x^2 + 1)]

then just plot each of those two above and combine them. But this could become really cumbersome since one could have a terribly complicated equation. So can this be done currently or someone needs a workaround to achieve this? excuse my english :)