[pstricks] Countor lines withe pst-3dplot

[Denis Vergès]

Hello,

I have do draw  the surface $z = 2x + 0.5y^2 + 4$. You can open :

www.fis.edu.hk/News/files/Bac%202005%20Maths%20Spec%20ES.pdf

(page 6)

How can I draw the countor lines 20-40, 60-80, 100-120 ?

No problems in 2d (figure under the surface).

Thanks for your answers.

Denis Vergès
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