[pstricks] Plotting function

[Denis Verges]

Hello,

I want plot with pst-3dplot the function :

z = 2x(y + 1)

with 0 < x 10, 0 < y < 12 and 0 < z < 260

In fact, I want the lines :
z = 40, z = 80, z = 120, z = 160, z = 200, z = 240.

How can I do this.

Thanks for your answer.

Denis