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ContourPlot3D and positive contours


Hello everyone :)

Using the ContourPlot3D, how can I plot only the positive contours (or
only the negative ones for that matter=85)
I would imagine an option like this :

ContourPlot3D[f,Contours->{#>0&,10}]

which would plot the first 10 positive contours. But that does not
exist=85

Right now, I'm plotting the contours of the positive part of my
function like this :

ContourPlot3D[1/2*(f+Abs[f]),Contours->{10}]

but that's not pretty=85

Is there a better way to do this ?

Thanks in advance :)


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