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Find y coord of a BezierSpline

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Hi, I use the function PolyBezier(), so I have a curve composed of "n" Bezier Curves , but I don''t know how to get the y coordinate of my curve giving the x coordinate. Is there a solution ? Thanks

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Since you know x you can, by successive approximations, find the corresponding t which, by feeding it back into the polynomial, give you y back.

Of course, it is slow but short of explicitely expressing the root of the polynomial that''s all you can do (bezier curves are only 3rd order polys after all, so an analytical solution exists, search the web)

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