sampleCp file in the backwardFacingStep2D tutorial doesn't work

Hello,

The sampleCp file provided in the tutorial backwardFacingStep2D does not seem to work.

There is no output from this function object patchProbes. What is the purpose of that file?

Another question that arises: How can one sample a field on a given patch without specifying the probe locations manually? Is it possible somehow for the function object to determine all the points on the patch automatically?

Thank you