The tool allows you to set up a quality of the model during the moving and in a static state.
Opacity threshold allows to ignore relatively transparent tissue when performing measurements and creating segments. That is, tissue which transparency level below a predetermined value, will be visible, but the points of the measuring tools will be projected on the tissue with a higher level of transparency. Such tissue will not be included in the segment.
To set up quality:
It the quality is high, update image may be delayed because of low computer resources.