3d slice on Patch figure

I draw 3d patch figure as the file attached.

I refered to the link here

https://kr.mathworks.com/matlabcentral/fileexchange/60939-3d-color-spaces

The figure is LCh in cylindrical coordinate

I want to plot it in 2d for L-C figure with specific h

but how can I slice the figure ?

Answer 1

[darova]

Use contour