how to extract layers of contour3 plot!

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wissam on 13 Apr 2012

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https://in.mathworks.com/matlabcentral/answers/35380-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