How to draw equipotential lines on surface plot?

I created a basic surface plot using meshgrid and a function d(x,y). My plot has a global minimum < -1 and a global maximum > 1. I want to draw three equipotential lines onto my surface plot, one where d(x,y) = -1, one where d(x,y) = 0 and one where d(x,y) = 1.

What is an easy and elegant way to do that? Thanks.

Answer 1

[Star Strider]

If I understand correctly what you want to do, use the contour3 (link) function.

The code would go something like this:

X = [ ... ];
Y = [ ... ];
Z = [ ... ];

figure
surf(X, Y, Z)
hold on
contour3(X, Y, Z, [-1, 0, 1])
hold off
grid on

[Georg Senft]

Thank you very much. In general I think I find a lot of your answers when looking for stuff online, always helpful, keep up the good work!

[Star Strider]

As always, my pleasure.

Thank you!