How to prevent hole closing?

I seem to have the opposite problem to others.

My scans sometimes have missing data (due to bad photoset) and I’d like to see this in the raw render.  At the moment they always get closed via interpolation.  Is there a way to prevent that?  Is there a threshold I can change to prevent automatic hole closing?

Interesting question.

I think the answer must be no though, because RC needs do create a continuous closed mesh, which is the reason for the much debated box around the object…