how to extract layers of contour3 plot!

Dear all, I have a matrix (N by N) and i plot the 3D contour using "contour3" function. The output figure is a 3D one (x,y,z) and has four layers inside, each layer has N by N matrix with same value of z, example: z=10, z=40, z=60, and z=100; I want to get only a certain layer which its values have the same value of z and save it as a new matrix, example: z=40; how can i do it in matlab? any help? thanks sam

Answer 1

[wissam]

any help?