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Why doesnt 3D Winplot draw implicitly defined surfaces?

April 26, 2017defined draw implicitly surfaces winplot

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Why doesnt 3D Winplot draw implicitly defined surfaces?

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It does, but (in contrast with implicit curves in 2D) not automatically. The program needs guidance. After entering the equation, the user is prompted to provide coordinates for a box that contains the surface. Having done this, the user must then click the levels button in the Inventory. See the Equa|Help text for more details.